[v9,1/3] String: Add support for __memcmpeq() ABI on all targets
Commit Message
No bug.
This commit adds support for __memcmpeq() as a new ABI for all
targets. In this commit __memcmpeq() is implemented only as an alias
to the corresponding targets memcmp() implementation. __memcmpeq() is
added as a new symbol starting with GLIBC_2.35 and defined in string.h
with comments explaining its behavior. Basic tests that it is callable
and works where added in string/tester.c
As discussed in the proposal "Add new ABI '__memcmpeq()' to libc"
__memcmpeq() is essentially a reserved namespace for bcmp(). The means
is shares the same specifications as memcmp() except the return value
for non-equal byte sequences is any non-zero value. This is less
strict than memcmp()'s return value specification and can be better
optimized when a boolean return is all that is needed.
__memcmpeq() is meant to only be called by compilers if they can prove
that the return value of a memcmp() call is only used for its boolean
value.
All tests in string/tester.c passed. As well build succeeds on
x86_64-linux-gnu target.
---
Kept one weak alias in in:
sysdeps/x86_64/memcmp.S
This will be preempted by the strong_alias in:
sysdeps/x86_64/multiarch/memcmp.c
string/Versions | 3 +++
string/memcmp.c | 2 ++
string/string.h | 16 ++++++++++++++++
string/tester.c | 16 ++++++++++++++++
sysdeps/aarch64/memcmp.S | 2 ++
sysdeps/csky/abiv2/memcmp.S | 1 +
sysdeps/i386/i686/memcmp.S | 2 ++
sysdeps/i386/i686/multiarch/memcmp.c | 1 +
sysdeps/i386/memcmp.S | 2 ++
sysdeps/ia64/memcmp.S | 1 +
sysdeps/mach/hurd/i386/libc.abilist | 1 +
sysdeps/powerpc/powerpc32/405/memcmp.S | 1 +
sysdeps/powerpc/powerpc32/power4/memcmp.S | 1 +
sysdeps/powerpc/powerpc32/power7/memcmp.S | 1 +
sysdeps/powerpc/powerpc64/le/power10/memcmp.S | 1 +
sysdeps/powerpc/powerpc64/power4/memcmp.S | 1 +
sysdeps/powerpc/powerpc64/power7/memcmp.S | 1 +
sysdeps/powerpc/powerpc64/power8/memcmp.S | 1 +
sysdeps/s390/memcmp-z900.S | 1 +
sysdeps/s390/memcmp.c | 1 +
sysdeps/sparc/sparc64/memcmp.S | 2 ++
sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 +
sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 +
sysdeps/unix/sysv/linux/arc/libc.abilist | 1 +
sysdeps/unix/sysv/linux/arm/be/libc.abilist | 1 +
sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 +
sysdeps/unix/sysv/linux/csky/libc.abilist | 1 +
sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 +
sysdeps/unix/sysv/linux/i386/libc.abilist | 1 +
sysdeps/unix/sysv/linux/ia64/libc.abilist | 1 +
.../unix/sysv/linux/m68k/coldfire/libc.abilist | 1 +
sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist | 1 +
.../unix/sysv/linux/microblaze/be/libc.abilist | 1 +
.../unix/sysv/linux/microblaze/le/libc.abilist | 1 +
.../unix/sysv/linux/mips/mips32/fpu/libc.abilist | 1 +
.../sysv/linux/mips/mips32/nofpu/libc.abilist | 1 +
.../unix/sysv/linux/mips/mips64/n32/libc.abilist | 1 +
.../unix/sysv/linux/mips/mips64/n64/libc.abilist | 1 +
sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 +
.../linux/powerpc/powerpc32/fpu/libc.abilist | 1 +
.../linux/powerpc/powerpc32/nofpu/libc.abilist | 1 +
.../sysv/linux/powerpc/powerpc64/be/libc.abilist | 1 +
.../sysv/linux/powerpc/powerpc64/le/libc.abilist | 1 +
sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist | 1 +
sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist | 1 +
.../unix/sysv/linux/s390/s390-32/libc.abilist | 1 +
.../unix/sysv/linux/s390/s390-64/libc.abilist | 1 +
sysdeps/unix/sysv/linux/sh/be/libc.abilist | 1 +
sysdeps/unix/sysv/linux/sh/le/libc.abilist | 1 +
.../unix/sysv/linux/sparc/sparc32/libc.abilist | 1 +
.../unix/sysv/linux/sparc/sparc64/libc.abilist | 1 +
sysdeps/unix/sysv/linux/x86_64/64/libc.abilist | 1 +
sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist | 1 +
sysdeps/x86_64/memcmp.S | 3 +++
sysdeps/x86_64/multiarch/memcmp.c | 2 ++
55 files changed, 95 insertions(+)
Comments
On Thu, Oct 21, 2021 at 10:51 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
>
> No bug.
>
> This commit adds support for __memcmpeq() as a new ABI for all
> targets. In this commit __memcmpeq() is implemented only as an alias
> to the corresponding targets memcmp() implementation. __memcmpeq() is
> added as a new symbol starting with GLIBC_2.35 and defined in string.h
> with comments explaining its behavior. Basic tests that it is callable
> and works where added in string/tester.c
>
> As discussed in the proposal "Add new ABI '__memcmpeq()' to libc"
> __memcmpeq() is essentially a reserved namespace for bcmp(). The means
> is shares the same specifications as memcmp() except the return value
> for non-equal byte sequences is any non-zero value. This is less
> strict than memcmp()'s return value specification and can be better
> optimized when a boolean return is all that is needed.
>
> __memcmpeq() is meant to only be called by compilers if they can prove
> that the return value of a memcmp() call is only used for its boolean
> value.
>
> All tests in string/tester.c passed. As well build succeeds on
> x86_64-linux-gnu target.
> ---
> Kept one weak alias in in:
> sysdeps/x86_64/memcmp.S
Please change it to strong_alias for --disable-multi-arch.
I think we need a NEWS entry for it.
> This will be preempted by the strong_alias in:
> sysdeps/x86_64/multiarch/memcmp.c
>
> string/Versions | 3 +++
> string/memcmp.c | 2 ++
> string/string.h | 16 ++++++++++++++++
> string/tester.c | 16 ++++++++++++++++
> sysdeps/aarch64/memcmp.S | 2 ++
> sysdeps/csky/abiv2/memcmp.S | 1 +
> sysdeps/i386/i686/memcmp.S | 2 ++
> sysdeps/i386/i686/multiarch/memcmp.c | 1 +
> sysdeps/i386/memcmp.S | 2 ++
> sysdeps/ia64/memcmp.S | 1 +
> sysdeps/mach/hurd/i386/libc.abilist | 1 +
> sysdeps/powerpc/powerpc32/405/memcmp.S | 1 +
> sysdeps/powerpc/powerpc32/power4/memcmp.S | 1 +
> sysdeps/powerpc/powerpc32/power7/memcmp.S | 1 +
> sysdeps/powerpc/powerpc64/le/power10/memcmp.S | 1 +
> sysdeps/powerpc/powerpc64/power4/memcmp.S | 1 +
> sysdeps/powerpc/powerpc64/power7/memcmp.S | 1 +
> sysdeps/powerpc/powerpc64/power8/memcmp.S | 1 +
> sysdeps/s390/memcmp-z900.S | 1 +
> sysdeps/s390/memcmp.c | 1 +
> sysdeps/sparc/sparc64/memcmp.S | 2 ++
> sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/arc/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/arm/be/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/csky/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/i386/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/ia64/libc.abilist | 1 +
> .../unix/sysv/linux/m68k/coldfire/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist | 1 +
> .../unix/sysv/linux/microblaze/be/libc.abilist | 1 +
> .../unix/sysv/linux/microblaze/le/libc.abilist | 1 +
> .../unix/sysv/linux/mips/mips32/fpu/libc.abilist | 1 +
> .../sysv/linux/mips/mips32/nofpu/libc.abilist | 1 +
> .../unix/sysv/linux/mips/mips64/n32/libc.abilist | 1 +
> .../unix/sysv/linux/mips/mips64/n64/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 +
> .../linux/powerpc/powerpc32/fpu/libc.abilist | 1 +
> .../linux/powerpc/powerpc32/nofpu/libc.abilist | 1 +
> .../sysv/linux/powerpc/powerpc64/be/libc.abilist | 1 +
> .../sysv/linux/powerpc/powerpc64/le/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist | 1 +
> .../unix/sysv/linux/s390/s390-32/libc.abilist | 1 +
> .../unix/sysv/linux/s390/s390-64/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/sh/be/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/sh/le/libc.abilist | 1 +
> .../unix/sysv/linux/sparc/sparc32/libc.abilist | 1 +
> .../unix/sysv/linux/sparc/sparc64/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/x86_64/64/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist | 1 +
> sysdeps/x86_64/memcmp.S | 3 +++
> sysdeps/x86_64/multiarch/memcmp.c | 2 ++
> 55 files changed, 95 insertions(+)
>
> diff --git a/string/Versions b/string/Versions
> index 298ecd401a..864c4cf7a4 100644
> --- a/string/Versions
> +++ b/string/Versions
> @@ -89,4 +89,7 @@ libc {
> sigdescr_np; sigabbrev_np;
> strerrordesc_np; strerrorname_np;
> }
> + GLIBC_2.35 {
> + __memcmpeq;
> + }
> }
> diff --git a/string/memcmp.c b/string/memcmp.c
> index 9b46d7a905..6e93a3128f 100644
> --- a/string/memcmp.c
> +++ b/string/memcmp.c
> @@ -358,4 +358,6 @@ libc_hidden_builtin_def(memcmp)
> #ifdef weak_alias
> # undef bcmp
> weak_alias (memcmp, bcmp)
> +# undef __memcmpeq
> +strong_alias (memcmp, __memcmpeq)
> #endif
> diff --git a/string/string.h b/string/string.h
> index b1b083edce..e70feeaeea 100644
> --- a/string/string.h
> +++ b/string/string.h
> @@ -64,6 +64,22 @@ extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1));
> extern int memcmp (const void *__s1, const void *__s2, size_t __n)
> __THROW __attribute_pure__ __nonnull ((1, 2));
>
> +/* Compare N bytes of S1 and S2. Return zero if S1 and S2 are equal.
> + Return some non-zero value otherwise.
> +
> + Essentially __memcmpeq has the exact same semantics as memcmp
> + except the return value is less constrained. memcmp is always a
> + correct implementation of __memcmpeq. As well !!memcmp, -memcmp,
> + or bcmp are correct implementations.
> +
> + __memcmpeq is meant to be used by compilers when memcmp return is
> + only used for its bolean value.
> +
> + __memcmpeq is declared only for use by compilers. Programs should
> + continue to use memcmp. */
> +extern int __memcmpeq (const void *__s1, const void *__s2, size_t __n)
> + __THROW __attribute_pure__ __nonnull ((1, 2));
> +
> /* Search N bytes of S for C. */
> #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
> extern "C++"
> diff --git a/string/tester.c b/string/tester.c
> index 778160ae6e..605b3f00f9 100644
> --- a/string/tester.c
> +++ b/string/tester.c
> @@ -1449,6 +1449,19 @@ test_bcmp (void)
> check(bcmp("abc", "def", 0) == 0, 8); /* Zero count. */
> }
>
> +static void
> +test_memcmpeq (void)
> +{
> + it = "__memcmpeq";
> + check (__memcmpeq ("a", "a", 1) == 0, 1); /* Identity. */
> + check (__memcmpeq ("abc", "abc", 3) == 0, 2); /* Multicharacter. */
> + check (__memcmpeq ("abcd", "abce", 4) != 0, 3); /* Honestly unequal. */
> + check (__memcmpeq ("abce", "abcd", 4) != 0, 4);
> + check (__memcmpeq ("alph", "beta", 4) != 0, 5);
> + check (__memcmpeq ("abce", "abcd", 3) == 0, 6); /* Count limited. */
> + check (__memcmpeq ("abc", "def", 0) == 0, 8); /* Zero count. */
> +}
> +
> static void
> test_strerror (void)
> {
> @@ -1611,6 +1624,9 @@ main (void)
> /* bcmp - somewhat like memcmp. */
> test_bcmp ();
>
> + /* __memcmpeq - somewhat like memcmp. */
> + test_memcmpeq ();
> +
> /* strndup. */
> test_strndup ();
>
> diff --git a/sysdeps/aarch64/memcmp.S b/sysdeps/aarch64/memcmp.S
> index c1937f6f5c..37f37b9191 100644
> --- a/sysdeps/aarch64/memcmp.S
> +++ b/sysdeps/aarch64/memcmp.S
> @@ -177,4 +177,6 @@ L(ret_0):
> END (memcmp)
> #undef bcmp
> weak_alias (memcmp, bcmp)
> +#undef __memcmpeq
> +strong_alias (memcmp, __memcmpeq)
> libc_hidden_builtin_def (memcmp)
> diff --git a/sysdeps/csky/abiv2/memcmp.S b/sysdeps/csky/abiv2/memcmp.S
> index 1560387618..2a4ae577b0 100644
> --- a/sysdeps/csky/abiv2/memcmp.S
> +++ b/sysdeps/csky/abiv2/memcmp.S
> @@ -138,5 +138,6 @@ ENTRY (memcmp)
> br .L_s1_aligned
> END (memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> libc_hidden_def (memcmp)
> .weak memcmp
> diff --git a/sysdeps/i386/i686/memcmp.S b/sysdeps/i386/i686/memcmp.S
> index b26b124fad..90266d904b 100644
> --- a/sysdeps/i386/i686/memcmp.S
> +++ b/sysdeps/i386/i686/memcmp.S
> @@ -405,4 +405,6 @@ L(table_32bytes) :
>
> #undef bcmp
> weak_alias (memcmp, bcmp)
> +#undef __memcmpeq
> +strong_alias (memcmp, __memcmpeq)
> libc_hidden_builtin_def (memcmp)
> diff --git a/sysdeps/i386/i686/multiarch/memcmp.c b/sysdeps/i386/i686/multiarch/memcmp.c
> index 6e058a8857..3b2815edbc 100644
> --- a/sysdeps/i386/i686/multiarch/memcmp.c
> +++ b/sysdeps/i386/i686/multiarch/memcmp.c
> @@ -29,4 +29,5 @@
> libc_ifunc_redirected (__redirect_memcmp, memcmp, IFUNC_SELECTOR ());
>
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> #endif
> diff --git a/sysdeps/i386/memcmp.S b/sysdeps/i386/memcmp.S
> index 1f212b0f6d..02473c2c0c 100644
> --- a/sysdeps/i386/memcmp.S
> +++ b/sysdeps/i386/memcmp.S
> @@ -70,4 +70,6 @@ END (memcmp)
>
> #undef bcmp
> weak_alias (memcmp, bcmp)
> +#undef __memcmpeq
> +strong_alias (memcmp, __memcmpeq)
> libc_hidden_builtin_def (memcmp)
> diff --git a/sysdeps/ia64/memcmp.S b/sysdeps/ia64/memcmp.S
> index 97539c23fd..7722908751 100644
> --- a/sysdeps/ia64/memcmp.S
> +++ b/sysdeps/ia64/memcmp.S
> @@ -160,4 +160,5 @@ ENTRY(memcmp)
> END(memcmp)
>
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> libc_hidden_builtin_def (memcmp)
> diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist
> index c5da10a0cd..e849d6fa35 100644
> --- a/sysdeps/mach/hurd/i386/libc.abilist
> +++ b/sysdeps/mach/hurd/i386/libc.abilist
> @@ -2285,6 +2285,7 @@ GLIBC_2.34 res_send F
> GLIBC_2.34 shm_open F
> GLIBC_2.34 shm_unlink F
> GLIBC_2.34 timespec_getres F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/powerpc/powerpc32/405/memcmp.S b/sysdeps/powerpc/powerpc32/405/memcmp.S
> index 6a6a54d90f..c2836040a7 100644
> --- a/sysdeps/powerpc/powerpc32/405/memcmp.S
> +++ b/sysdeps/powerpc/powerpc32/405/memcmp.S
> @@ -126,3 +126,4 @@ L(st2):
> END (memcmp)
> libc_hidden_builtin_def (memcmp)
> weak_alias (memcmp,bcmp)
> +strong_alias (memcmp, __memcmpeq)
> diff --git a/sysdeps/powerpc/powerpc32/power4/memcmp.S b/sysdeps/powerpc/powerpc32/power4/memcmp.S
> index 814d2f211d..f58e34aba5 100644
> --- a/sysdeps/powerpc/powerpc32/power4/memcmp.S
> +++ b/sysdeps/powerpc/powerpc32/power4/memcmp.S
> @@ -1373,3 +1373,4 @@ END (memcmp)
>
> libc_hidden_builtin_def (memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> diff --git a/sysdeps/powerpc/powerpc32/power7/memcmp.S b/sysdeps/powerpc/powerpc32/power7/memcmp.S
> index 8a19953e2d..f8deb4e32c 100644
> --- a/sysdeps/powerpc/powerpc32/power7/memcmp.S
> +++ b/sysdeps/powerpc/powerpc32/power7/memcmp.S
> @@ -1373,3 +1373,4 @@ END (memcmp)
>
> libc_hidden_builtin_def (memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> diff --git a/sysdeps/powerpc/powerpc64/le/power10/memcmp.S b/sysdeps/powerpc/powerpc64/le/power10/memcmp.S
> index 52f244e7e7..f81c73a29c 100644
> --- a/sysdeps/powerpc/powerpc64/le/power10/memcmp.S
> +++ b/sysdeps/powerpc/powerpc64/le/power10/memcmp.S
> @@ -177,3 +177,4 @@ L(tail8):
> END (MEMCMP)
> libc_hidden_builtin_def (memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> diff --git a/sysdeps/powerpc/powerpc64/power4/memcmp.S b/sysdeps/powerpc/powerpc64/power4/memcmp.S
> index dc1be3a0d8..cc82be115f 100644
> --- a/sysdeps/powerpc/powerpc64/power4/memcmp.S
> +++ b/sysdeps/powerpc/powerpc64/power4/memcmp.S
> @@ -1374,3 +1374,4 @@ L(duzeroLength):
> END (MEMCMP)
> libc_hidden_builtin_def (memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> diff --git a/sysdeps/powerpc/powerpc64/power7/memcmp.S b/sysdeps/powerpc/powerpc64/power7/memcmp.S
> index bc034a55bc..3044f7ede9 100644
> --- a/sysdeps/powerpc/powerpc64/power7/memcmp.S
> +++ b/sysdeps/powerpc/powerpc64/power7/memcmp.S
> @@ -1059,3 +1059,4 @@ L(duzeroLength):
> END (MEMCMP)
> libc_hidden_builtin_def (memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> diff --git a/sysdeps/powerpc/powerpc64/power8/memcmp.S b/sysdeps/powerpc/powerpc64/power8/memcmp.S
> index b676b09a9b..0c6a154502 100644
> --- a/sysdeps/powerpc/powerpc64/power8/memcmp.S
> +++ b/sysdeps/powerpc/powerpc64/power8/memcmp.S
> @@ -1442,3 +1442,4 @@ L(duzeroLength):
> END (MEMCMP)
> libc_hidden_builtin_def (memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> diff --git a/sysdeps/s390/memcmp-z900.S b/sysdeps/s390/memcmp-z900.S
> index 995d52e47d..d625bf90dd 100644
> --- a/sysdeps/s390/memcmp-z900.S
> +++ b/sysdeps/s390/memcmp-z900.S
> @@ -164,6 +164,7 @@ END(MEMCMP_Z196)
> Otherwise see sysdeps/s390/memcmp.c. */
> strong_alias (MEMCMP_DEFAULT, memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> #endif
>
> #if defined SHARED && IS_IN (libc)
> diff --git a/sysdeps/s390/memcmp.c b/sysdeps/s390/memcmp.c
> index 0b4e9da717..52c20af772 100644
> --- a/sysdeps/s390/memcmp.c
> +++ b/sysdeps/s390/memcmp.c
> @@ -46,4 +46,5 @@ s390_libc_ifunc_expr (__redirect_memcmp, memcmp,
> })
> )
> weak_alias (memcmp, bcmp);
> +strong_alias (memcmp, __memcmpeq)
> #endif
> diff --git a/sysdeps/sparc/sparc64/memcmp.S b/sysdeps/sparc/sparc64/memcmp.S
> index d8d9ff9b24..fefeee5f5d 100644
> --- a/sysdeps/sparc/sparc64/memcmp.S
> +++ b/sysdeps/sparc/sparc64/memcmp.S
> @@ -137,4 +137,6 @@ END(memcmp)
>
> #undef bcmp
> weak_alias (memcmp, bcmp)
> +#undef __memcmpeq
> +strong_alias (memcmp, __memcmpeq)
> libc_hidden_builtin_def (memcmp)
> diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> index 21a2e50a88..f227ae6cee 100644
> --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> @@ -2612,3 +2612,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> index a201fd69ba..0ccc3fc73e 100644
> --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> @@ -2709,6 +2709,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist
> index 2611436937..fd80704787 100644
> --- a/sysdeps/unix/sysv/linux/arc/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/arc/libc.abilist
> @@ -2373,3 +2373,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> index a426241965..2ae6c58b8a 100644
> --- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> @@ -491,6 +491,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _Exit F
> GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
> GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
> diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> index 02f80418cc..fcfd1e8594 100644
> --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> @@ -488,6 +488,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _Exit F
> GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
> GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
> diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist
> index b7676eb372..ba034b8541 100644
> --- a/sysdeps/unix/sysv/linux/csky/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist
> @@ -2647,3 +2647,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> index f6965c9d95..b7460bec8a 100644
> --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> @@ -2596,6 +2596,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
> index 2e7603d9ed..a4dc341ded 100644
> --- a/sysdeps/unix/sysv/linux/i386/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
> @@ -2780,6 +2780,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> index dd3a56d3fe..94b222dbc7 100644
> --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> @@ -2547,6 +2547,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> index c1e0ea9c10..12fd3b6310 100644
> --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> @@ -492,6 +492,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _Exit F
> GLIBC_2.4 _IO_2_1_stderr_ D 0x98
> GLIBC_2.4 _IO_2_1_stdin_ D 0x98
> diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> index 93161048ca..4d2296007a 100644
> --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> @@ -2723,6 +2723,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> index 0aaeec8a27..a223278a3d 100644
> --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> @@ -2696,3 +2696,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> index bec5f456c9..780a4f5b0b 100644
> --- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> @@ -2693,3 +2693,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> index 97d2127f78..cd65136062 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> @@ -2688,6 +2688,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> index acb0756c11..b5b9902db5 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> @@ -2686,6 +2686,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> index ebc21dde1e..57593d5f94 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> @@ -2694,6 +2694,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> index c68f7e3c6c..e944d76bed 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> @@ -2598,6 +2598,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> index e5b6834f14..8af5a3a90d 100644
> --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> @@ -2735,3 +2735,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> index 132707c8ad..3a0213b39f 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> @@ -2750,6 +2750,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> index 0af2be31a0..f57df0234b 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> @@ -2783,6 +2783,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> index cf864632d0..259a0cfc51 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> @@ -2506,6 +2506,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> index d566d675d0..126541daf1 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> @@ -2808,3 +2808,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> index c9a7eacb32..05df4d13d2 100644
> --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> @@ -2375,3 +2375,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> index 8299131cb2..8e349cbff8 100644
> --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> @@ -2575,3 +2575,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> index c3fe78f77f..e9de402766 100644
> --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> @@ -2748,6 +2748,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> index 83e542aa8c..1a010c745d 100644
> --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> @@ -2543,6 +2543,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> index dc502f6833..22ce530975 100644
> --- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> @@ -2603,6 +2603,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> index cba1abb556..960df07b83 100644
> --- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> @@ -2600,6 +2600,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> index d4a516fb47..eedb376f3d 100644
> --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> @@ -2743,6 +2743,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> index 6268875ba3..86e0c92bef 100644
> --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> @@ -2570,6 +2570,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> index 095e914b73..5e59d90623 100644
> --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> @@ -2521,6 +2521,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> index dd910f7fe9..94412dc134 100644
> --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> @@ -2627,3 +2627,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/x86_64/memcmp.S b/sysdeps/x86_64/memcmp.S
> index 870e15c5a0..f60ddb2ed1 100644
> --- a/sysdeps/x86_64/memcmp.S
> +++ b/sysdeps/x86_64/memcmp.S
> @@ -358,4 +358,7 @@ END(memcmp)
>
> #undef bcmp
> weak_alias (memcmp, bcmp)
> +/* Weak alias for __memcmpeq here as it will be preempted by
> + definition coming from IFUNC in multiarch/memcmp.c. */
> +weak_alias (memcmp, __memcmpeq)
> libc_hidden_builtin_def (memcmp)
> diff --git a/sysdeps/x86_64/multiarch/memcmp.c b/sysdeps/x86_64/multiarch/memcmp.c
> index fe725f3563..4a3aad2c9c 100644
> --- a/sysdeps/x86_64/multiarch/memcmp.c
> +++ b/sysdeps/x86_64/multiarch/memcmp.c
> @@ -29,6 +29,8 @@
> libc_ifunc_redirected (__redirect_memcmp, memcmp, IFUNC_SELECTOR ());
> # undef bcmp
> weak_alias (memcmp, bcmp)
> +# undef __memcmpeq
> +strong_alias (memcmp, __memcmpeq)
>
> # ifdef SHARED
> __hidden_ver1 (memcmp, __GI_memcmp, __redirect_memcmp)
> --
> 2.25.1
>
On Fri, Oct 22, 2021 at 7:39 AM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> On Thu, Oct 21, 2021 at 10:51 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> >
> > No bug.
> >
> > This commit adds support for __memcmpeq() as a new ABI for all
> > targets. In this commit __memcmpeq() is implemented only as an alias
> > to the corresponding targets memcmp() implementation. __memcmpeq() is
> > added as a new symbol starting with GLIBC_2.35 and defined in string.h
> > with comments explaining its behavior. Basic tests that it is callable
> > and works where added in string/tester.c
> >
> > As discussed in the proposal "Add new ABI '__memcmpeq()' to libc"
> > __memcmpeq() is essentially a reserved namespace for bcmp(). The means
> > is shares the same specifications as memcmp() except the return value
> > for non-equal byte sequences is any non-zero value. This is less
> > strict than memcmp()'s return value specification and can be better
> > optimized when a boolean return is all that is needed.
> >
> > __memcmpeq() is meant to only be called by compilers if they can prove
> > that the return value of a memcmp() call is only used for its boolean
> > value.
> >
> > All tests in string/tester.c passed. As well build succeeds on
> > x86_64-linux-gnu target.
> > ---
> > Kept one weak alias in in:
> > sysdeps/x86_64/memcmp.S
>
> Please change it to strong_alias for --disable-multi-arch.
Done.
>
> I think we need a NEWS entry for it.
Added in a new patch.
>
> > This will be preempted by the strong_alias in:
> > sysdeps/x86_64/multiarch/memcmp.c
> >
> > string/Versions | 3 +++
> > string/memcmp.c | 2 ++
> > string/string.h | 16 ++++++++++++++++
> > string/tester.c | 16 ++++++++++++++++
> > sysdeps/aarch64/memcmp.S | 2 ++
> > sysdeps/csky/abiv2/memcmp.S | 1 +
> > sysdeps/i386/i686/memcmp.S | 2 ++
> > sysdeps/i386/i686/multiarch/memcmp.c | 1 +
> > sysdeps/i386/memcmp.S | 2 ++
> > sysdeps/ia64/memcmp.S | 1 +
> > sysdeps/mach/hurd/i386/libc.abilist | 1 +
> > sysdeps/powerpc/powerpc32/405/memcmp.S | 1 +
> > sysdeps/powerpc/powerpc32/power4/memcmp.S | 1 +
> > sysdeps/powerpc/powerpc32/power7/memcmp.S | 1 +
> > sysdeps/powerpc/powerpc64/le/power10/memcmp.S | 1 +
> > sysdeps/powerpc/powerpc64/power4/memcmp.S | 1 +
> > sysdeps/powerpc/powerpc64/power7/memcmp.S | 1 +
> > sysdeps/powerpc/powerpc64/power8/memcmp.S | 1 +
> > sysdeps/s390/memcmp-z900.S | 1 +
> > sysdeps/s390/memcmp.c | 1 +
> > sysdeps/sparc/sparc64/memcmp.S | 2 ++
> > sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/arc/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/arm/be/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/csky/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/i386/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/ia64/libc.abilist | 1 +
> > .../unix/sysv/linux/m68k/coldfire/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist | 1 +
> > .../unix/sysv/linux/microblaze/be/libc.abilist | 1 +
> > .../unix/sysv/linux/microblaze/le/libc.abilist | 1 +
> > .../unix/sysv/linux/mips/mips32/fpu/libc.abilist | 1 +
> > .../sysv/linux/mips/mips32/nofpu/libc.abilist | 1 +
> > .../unix/sysv/linux/mips/mips64/n32/libc.abilist | 1 +
> > .../unix/sysv/linux/mips/mips64/n64/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 +
> > .../linux/powerpc/powerpc32/fpu/libc.abilist | 1 +
> > .../linux/powerpc/powerpc32/nofpu/libc.abilist | 1 +
> > .../sysv/linux/powerpc/powerpc64/be/libc.abilist | 1 +
> > .../sysv/linux/powerpc/powerpc64/le/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist | 1 +
> > .../unix/sysv/linux/s390/s390-32/libc.abilist | 1 +
> > .../unix/sysv/linux/s390/s390-64/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/sh/be/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/sh/le/libc.abilist | 1 +
> > .../unix/sysv/linux/sparc/sparc32/libc.abilist | 1 +
> > .../unix/sysv/linux/sparc/sparc64/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/x86_64/64/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist | 1 +
> > sysdeps/x86_64/memcmp.S | 3 +++
> > sysdeps/x86_64/multiarch/memcmp.c | 2 ++
> > 55 files changed, 95 insertions(+)
> >
> > diff --git a/string/Versions b/string/Versions
> > index 298ecd401a..864c4cf7a4 100644
> > --- a/string/Versions
> > +++ b/string/Versions
> > @@ -89,4 +89,7 @@ libc {
> > sigdescr_np; sigabbrev_np;
> > strerrordesc_np; strerrorname_np;
> > }
> > + GLIBC_2.35 {
> > + __memcmpeq;
> > + }
> > }
> > diff --git a/string/memcmp.c b/string/memcmp.c
> > index 9b46d7a905..6e93a3128f 100644
> > --- a/string/memcmp.c
> > +++ b/string/memcmp.c
> > @@ -358,4 +358,6 @@ libc_hidden_builtin_def(memcmp)
> > #ifdef weak_alias
> > # undef bcmp
> > weak_alias (memcmp, bcmp)
> > +# undef __memcmpeq
> > +strong_alias (memcmp, __memcmpeq)
> > #endif
> > diff --git a/string/string.h b/string/string.h
> > index b1b083edce..e70feeaeea 100644
> > --- a/string/string.h
> > +++ b/string/string.h
> > @@ -64,6 +64,22 @@ extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1));
> > extern int memcmp (const void *__s1, const void *__s2, size_t __n)
> > __THROW __attribute_pure__ __nonnull ((1, 2));
> >
> > +/* Compare N bytes of S1 and S2. Return zero if S1 and S2 are equal.
> > + Return some non-zero value otherwise.
> > +
> > + Essentially __memcmpeq has the exact same semantics as memcmp
> > + except the return value is less constrained. memcmp is always a
> > + correct implementation of __memcmpeq. As well !!memcmp, -memcmp,
> > + or bcmp are correct implementations.
> > +
> > + __memcmpeq is meant to be used by compilers when memcmp return is
> > + only used for its bolean value.
> > +
> > + __memcmpeq is declared only for use by compilers. Programs should
> > + continue to use memcmp. */
> > +extern int __memcmpeq (const void *__s1, const void *__s2, size_t __n)
> > + __THROW __attribute_pure__ __nonnull ((1, 2));
> > +
> > /* Search N bytes of S for C. */
> > #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
> > extern "C++"
> > diff --git a/string/tester.c b/string/tester.c
> > index 778160ae6e..605b3f00f9 100644
> > --- a/string/tester.c
> > +++ b/string/tester.c
> > @@ -1449,6 +1449,19 @@ test_bcmp (void)
> > check(bcmp("abc", "def", 0) == 0, 8); /* Zero count. */
> > }
> >
> > +static void
> > +test_memcmpeq (void)
> > +{
> > + it = "__memcmpeq";
> > + check (__memcmpeq ("a", "a", 1) == 0, 1); /* Identity. */
> > + check (__memcmpeq ("abc", "abc", 3) == 0, 2); /* Multicharacter. */
> > + check (__memcmpeq ("abcd", "abce", 4) != 0, 3); /* Honestly unequal. */
> > + check (__memcmpeq ("abce", "abcd", 4) != 0, 4);
> > + check (__memcmpeq ("alph", "beta", 4) != 0, 5);
> > + check (__memcmpeq ("abce", "abcd", 3) == 0, 6); /* Count limited. */
> > + check (__memcmpeq ("abc", "def", 0) == 0, 8); /* Zero count. */
> > +}
> > +
> > static void
> > test_strerror (void)
> > {
> > @@ -1611,6 +1624,9 @@ main (void)
> > /* bcmp - somewhat like memcmp. */
> > test_bcmp ();
> >
> > + /* __memcmpeq - somewhat like memcmp. */
> > + test_memcmpeq ();
> > +
> > /* strndup. */
> > test_strndup ();
> >
> > diff --git a/sysdeps/aarch64/memcmp.S b/sysdeps/aarch64/memcmp.S
> > index c1937f6f5c..37f37b9191 100644
> > --- a/sysdeps/aarch64/memcmp.S
> > +++ b/sysdeps/aarch64/memcmp.S
> > @@ -177,4 +177,6 @@ L(ret_0):
> > END (memcmp)
> > #undef bcmp
> > weak_alias (memcmp, bcmp)
> > +#undef __memcmpeq
> > +strong_alias (memcmp, __memcmpeq)
> > libc_hidden_builtin_def (memcmp)
> > diff --git a/sysdeps/csky/abiv2/memcmp.S b/sysdeps/csky/abiv2/memcmp.S
> > index 1560387618..2a4ae577b0 100644
> > --- a/sysdeps/csky/abiv2/memcmp.S
> > +++ b/sysdeps/csky/abiv2/memcmp.S
> > @@ -138,5 +138,6 @@ ENTRY (memcmp)
> > br .L_s1_aligned
> > END (memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > libc_hidden_def (memcmp)
> > .weak memcmp
> > diff --git a/sysdeps/i386/i686/memcmp.S b/sysdeps/i386/i686/memcmp.S
> > index b26b124fad..90266d904b 100644
> > --- a/sysdeps/i386/i686/memcmp.S
> > +++ b/sysdeps/i386/i686/memcmp.S
> > @@ -405,4 +405,6 @@ L(table_32bytes) :
> >
> > #undef bcmp
> > weak_alias (memcmp, bcmp)
> > +#undef __memcmpeq
> > +strong_alias (memcmp, __memcmpeq)
> > libc_hidden_builtin_def (memcmp)
> > diff --git a/sysdeps/i386/i686/multiarch/memcmp.c b/sysdeps/i386/i686/multiarch/memcmp.c
> > index 6e058a8857..3b2815edbc 100644
> > --- a/sysdeps/i386/i686/multiarch/memcmp.c
> > +++ b/sysdeps/i386/i686/multiarch/memcmp.c
> > @@ -29,4 +29,5 @@
> > libc_ifunc_redirected (__redirect_memcmp, memcmp, IFUNC_SELECTOR ());
> >
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > #endif
> > diff --git a/sysdeps/i386/memcmp.S b/sysdeps/i386/memcmp.S
> > index 1f212b0f6d..02473c2c0c 100644
> > --- a/sysdeps/i386/memcmp.S
> > +++ b/sysdeps/i386/memcmp.S
> > @@ -70,4 +70,6 @@ END (memcmp)
> >
> > #undef bcmp
> > weak_alias (memcmp, bcmp)
> > +#undef __memcmpeq
> > +strong_alias (memcmp, __memcmpeq)
> > libc_hidden_builtin_def (memcmp)
> > diff --git a/sysdeps/ia64/memcmp.S b/sysdeps/ia64/memcmp.S
> > index 97539c23fd..7722908751 100644
> > --- a/sysdeps/ia64/memcmp.S
> > +++ b/sysdeps/ia64/memcmp.S
> > @@ -160,4 +160,5 @@ ENTRY(memcmp)
> > END(memcmp)
> >
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > libc_hidden_builtin_def (memcmp)
> > diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist
> > index c5da10a0cd..e849d6fa35 100644
> > --- a/sysdeps/mach/hurd/i386/libc.abilist
> > +++ b/sysdeps/mach/hurd/i386/libc.abilist
> > @@ -2285,6 +2285,7 @@ GLIBC_2.34 res_send F
> > GLIBC_2.34 shm_open F
> > GLIBC_2.34 shm_unlink F
> > GLIBC_2.34 timespec_getres F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/powerpc/powerpc32/405/memcmp.S b/sysdeps/powerpc/powerpc32/405/memcmp.S
> > index 6a6a54d90f..c2836040a7 100644
> > --- a/sysdeps/powerpc/powerpc32/405/memcmp.S
> > +++ b/sysdeps/powerpc/powerpc32/405/memcmp.S
> > @@ -126,3 +126,4 @@ L(st2):
> > END (memcmp)
> > libc_hidden_builtin_def (memcmp)
> > weak_alias (memcmp,bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > diff --git a/sysdeps/powerpc/powerpc32/power4/memcmp.S b/sysdeps/powerpc/powerpc32/power4/memcmp.S
> > index 814d2f211d..f58e34aba5 100644
> > --- a/sysdeps/powerpc/powerpc32/power4/memcmp.S
> > +++ b/sysdeps/powerpc/powerpc32/power4/memcmp.S
> > @@ -1373,3 +1373,4 @@ END (memcmp)
> >
> > libc_hidden_builtin_def (memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > diff --git a/sysdeps/powerpc/powerpc32/power7/memcmp.S b/sysdeps/powerpc/powerpc32/power7/memcmp.S
> > index 8a19953e2d..f8deb4e32c 100644
> > --- a/sysdeps/powerpc/powerpc32/power7/memcmp.S
> > +++ b/sysdeps/powerpc/powerpc32/power7/memcmp.S
> > @@ -1373,3 +1373,4 @@ END (memcmp)
> >
> > libc_hidden_builtin_def (memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > diff --git a/sysdeps/powerpc/powerpc64/le/power10/memcmp.S b/sysdeps/powerpc/powerpc64/le/power10/memcmp.S
> > index 52f244e7e7..f81c73a29c 100644
> > --- a/sysdeps/powerpc/powerpc64/le/power10/memcmp.S
> > +++ b/sysdeps/powerpc/powerpc64/le/power10/memcmp.S
> > @@ -177,3 +177,4 @@ L(tail8):
> > END (MEMCMP)
> > libc_hidden_builtin_def (memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > diff --git a/sysdeps/powerpc/powerpc64/power4/memcmp.S b/sysdeps/powerpc/powerpc64/power4/memcmp.S
> > index dc1be3a0d8..cc82be115f 100644
> > --- a/sysdeps/powerpc/powerpc64/power4/memcmp.S
> > +++ b/sysdeps/powerpc/powerpc64/power4/memcmp.S
> > @@ -1374,3 +1374,4 @@ L(duzeroLength):
> > END (MEMCMP)
> > libc_hidden_builtin_def (memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > diff --git a/sysdeps/powerpc/powerpc64/power7/memcmp.S b/sysdeps/powerpc/powerpc64/power7/memcmp.S
> > index bc034a55bc..3044f7ede9 100644
> > --- a/sysdeps/powerpc/powerpc64/power7/memcmp.S
> > +++ b/sysdeps/powerpc/powerpc64/power7/memcmp.S
> > @@ -1059,3 +1059,4 @@ L(duzeroLength):
> > END (MEMCMP)
> > libc_hidden_builtin_def (memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > diff --git a/sysdeps/powerpc/powerpc64/power8/memcmp.S b/sysdeps/powerpc/powerpc64/power8/memcmp.S
> > index b676b09a9b..0c6a154502 100644
> > --- a/sysdeps/powerpc/powerpc64/power8/memcmp.S
> > +++ b/sysdeps/powerpc/powerpc64/power8/memcmp.S
> > @@ -1442,3 +1442,4 @@ L(duzeroLength):
> > END (MEMCMP)
> > libc_hidden_builtin_def (memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > diff --git a/sysdeps/s390/memcmp-z900.S b/sysdeps/s390/memcmp-z900.S
> > index 995d52e47d..d625bf90dd 100644
> > --- a/sysdeps/s390/memcmp-z900.S
> > +++ b/sysdeps/s390/memcmp-z900.S
> > @@ -164,6 +164,7 @@ END(MEMCMP_Z196)
> > Otherwise see sysdeps/s390/memcmp.c. */
> > strong_alias (MEMCMP_DEFAULT, memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > #endif
> >
> > #if defined SHARED && IS_IN (libc)
> > diff --git a/sysdeps/s390/memcmp.c b/sysdeps/s390/memcmp.c
> > index 0b4e9da717..52c20af772 100644
> > --- a/sysdeps/s390/memcmp.c
> > +++ b/sysdeps/s390/memcmp.c
> > @@ -46,4 +46,5 @@ s390_libc_ifunc_expr (__redirect_memcmp, memcmp,
> > })
> > )
> > weak_alias (memcmp, bcmp);
> > +strong_alias (memcmp, __memcmpeq)
> > #endif
> > diff --git a/sysdeps/sparc/sparc64/memcmp.S b/sysdeps/sparc/sparc64/memcmp.S
> > index d8d9ff9b24..fefeee5f5d 100644
> > --- a/sysdeps/sparc/sparc64/memcmp.S
> > +++ b/sysdeps/sparc/sparc64/memcmp.S
> > @@ -137,4 +137,6 @@ END(memcmp)
> >
> > #undef bcmp
> > weak_alias (memcmp, bcmp)
> > +#undef __memcmpeq
> > +strong_alias (memcmp, __memcmpeq)
> > libc_hidden_builtin_def (memcmp)
> > diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> > index 21a2e50a88..f227ae6cee 100644
> > --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> > @@ -2612,3 +2612,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> > index a201fd69ba..0ccc3fc73e 100644
> > --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> > @@ -2709,6 +2709,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _IO_fprintf F
> > GLIBC_2.4 _IO_printf F
> > GLIBC_2.4 _IO_sprintf F
> > diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist
> > index 2611436937..fd80704787 100644
> > --- a/sysdeps/unix/sysv/linux/arc/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/arc/libc.abilist
> > @@ -2373,3 +2373,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> > index a426241965..2ae6c58b8a 100644
> > --- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> > @@ -491,6 +491,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _Exit F
> > GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
> > GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
> > diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> > index 02f80418cc..fcfd1e8594 100644
> > --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> > @@ -488,6 +488,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _Exit F
> > GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
> > GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
> > diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist
> > index b7676eb372..ba034b8541 100644
> > --- a/sysdeps/unix/sysv/linux/csky/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist
> > @@ -2647,3 +2647,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> > index f6965c9d95..b7460bec8a 100644
> > --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> > @@ -2596,6 +2596,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
> > index 2e7603d9ed..a4dc341ded 100644
> > --- a/sysdeps/unix/sysv/linux/i386/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
> > @@ -2780,6 +2780,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> > index dd3a56d3fe..94b222dbc7 100644
> > --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> > @@ -2547,6 +2547,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> > index c1e0ea9c10..12fd3b6310 100644
> > --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> > @@ -492,6 +492,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _Exit F
> > GLIBC_2.4 _IO_2_1_stderr_ D 0x98
> > GLIBC_2.4 _IO_2_1_stdin_ D 0x98
> > diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> > index 93161048ca..4d2296007a 100644
> > --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> > @@ -2723,6 +2723,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> > index 0aaeec8a27..a223278a3d 100644
> > --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> > @@ -2696,3 +2696,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> > index bec5f456c9..780a4f5b0b 100644
> > --- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> > @@ -2693,3 +2693,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> > index 97d2127f78..cd65136062 100644
> > --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> > @@ -2688,6 +2688,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> > index acb0756c11..b5b9902db5 100644
> > --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> > @@ -2686,6 +2686,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> > index ebc21dde1e..57593d5f94 100644
> > --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> > @@ -2694,6 +2694,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> > index c68f7e3c6c..e944d76bed 100644
> > --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> > @@ -2598,6 +2598,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> > index e5b6834f14..8af5a3a90d 100644
> > --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> > @@ -2735,3 +2735,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> > index 132707c8ad..3a0213b39f 100644
> > --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> > @@ -2750,6 +2750,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _IO_fprintf F
> > GLIBC_2.4 _IO_printf F
> > GLIBC_2.4 _IO_sprintf F
> > diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> > index 0af2be31a0..f57df0234b 100644
> > --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> > @@ -2783,6 +2783,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _IO_fprintf F
> > GLIBC_2.4 _IO_printf F
> > GLIBC_2.4 _IO_sprintf F
> > diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> > index cf864632d0..259a0cfc51 100644
> > --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> > @@ -2506,6 +2506,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _IO_fprintf F
> > GLIBC_2.4 _IO_printf F
> > GLIBC_2.4 _IO_sprintf F
> > diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> > index d566d675d0..126541daf1 100644
> > --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> > @@ -2808,3 +2808,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> > index c9a7eacb32..05df4d13d2 100644
> > --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> > @@ -2375,3 +2375,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> > index 8299131cb2..8e349cbff8 100644
> > --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> > @@ -2575,3 +2575,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> > index c3fe78f77f..e9de402766 100644
> > --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> > @@ -2748,6 +2748,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _IO_fprintf F
> > GLIBC_2.4 _IO_printf F
> > GLIBC_2.4 _IO_sprintf F
> > diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> > index 83e542aa8c..1a010c745d 100644
> > --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> > @@ -2543,6 +2543,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _IO_fprintf F
> > GLIBC_2.4 _IO_printf F
> > GLIBC_2.4 _IO_sprintf F
> > diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> > index dc502f6833..22ce530975 100644
> > --- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> > @@ -2603,6 +2603,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> > index cba1abb556..960df07b83 100644
> > --- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> > @@ -2600,6 +2600,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> > index d4a516fb47..eedb376f3d 100644
> > --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> > @@ -2743,6 +2743,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _IO_fprintf F
> > GLIBC_2.4 _IO_printf F
> > GLIBC_2.4 _IO_sprintf F
> > diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> > index 6268875ba3..86e0c92bef 100644
> > --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> > @@ -2570,6 +2570,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> > index 095e914b73..5e59d90623 100644
> > --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> > @@ -2521,6 +2521,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> > index dd910f7fe9..94412dc134 100644
> > --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> > @@ -2627,3 +2627,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/x86_64/memcmp.S b/sysdeps/x86_64/memcmp.S
> > index 870e15c5a0..f60ddb2ed1 100644
> > --- a/sysdeps/x86_64/memcmp.S
> > +++ b/sysdeps/x86_64/memcmp.S
> > @@ -358,4 +358,7 @@ END(memcmp)
> >
> > #undef bcmp
> > weak_alias (memcmp, bcmp)
> > +/* Weak alias for __memcmpeq here as it will be preempted by
> > + definition coming from IFUNC in multiarch/memcmp.c. */
> > +weak_alias (memcmp, __memcmpeq)
> > libc_hidden_builtin_def (memcmp)
> > diff --git a/sysdeps/x86_64/multiarch/memcmp.c b/sysdeps/x86_64/multiarch/memcmp.c
> > index fe725f3563..4a3aad2c9c 100644
> > --- a/sysdeps/x86_64/multiarch/memcmp.c
> > +++ b/sysdeps/x86_64/multiarch/memcmp.c
> > @@ -29,6 +29,8 @@
> > libc_ifunc_redirected (__redirect_memcmp, memcmp, IFUNC_SELECTOR ());
> > # undef bcmp
> > weak_alias (memcmp, bcmp)
> > +# undef __memcmpeq
> > +strong_alias (memcmp, __memcmpeq)
> >
> > # ifdef SHARED
> > __hidden_ver1 (memcmp, __GI_memcmp, __redirect_memcmp)
> > --
> > 2.25.1
> >
>
>
> --
> H.J.
On Fri, Oct 22, 2021 at 12:51 AM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
>
> No bug.
>
> This commit adds support for __memcmpeq() as a new ABI for all
> targets. In this commit __memcmpeq() is implemented only as an alias
> to the corresponding targets memcmp() implementation. __memcmpeq() is
> added as a new symbol starting with GLIBC_2.35 and defined in string.h
> with comments explaining its behavior. Basic tests that it is callable
> and works where added in string/tester.c
>
> As discussed in the proposal "Add new ABI '__memcmpeq()' to libc"
> __memcmpeq() is essentially a reserved namespace for bcmp(). The means
> is shares the same specifications as memcmp() except the return value
> for non-equal byte sequences is any non-zero value. This is less
> strict than memcmp()'s return value specification and can be better
> optimized when a boolean return is all that is needed.
>
> __memcmpeq() is meant to only be called by compilers if they can prove
> that the return value of a memcmp() call is only used for its boolean
> value.
>
> All tests in string/tester.c passed. As well build succeeds on
> x86_64-linux-gnu target.
> ---
> Kept one weak alias in in:
> sysdeps/x86_64/memcmp.S
>
> This will be preempted by the strong_alias in:
> sysdeps/x86_64/multiarch/memcmp.c
This issue is present on some other builds. Fixing.
>
> string/Versions | 3 +++
> string/memcmp.c | 2 ++
> string/string.h | 16 ++++++++++++++++
> string/tester.c | 16 ++++++++++++++++
> sysdeps/aarch64/memcmp.S | 2 ++
> sysdeps/csky/abiv2/memcmp.S | 1 +
> sysdeps/i386/i686/memcmp.S | 2 ++
> sysdeps/i386/i686/multiarch/memcmp.c | 1 +
> sysdeps/i386/memcmp.S | 2 ++
> sysdeps/ia64/memcmp.S | 1 +
> sysdeps/mach/hurd/i386/libc.abilist | 1 +
> sysdeps/powerpc/powerpc32/405/memcmp.S | 1 +
> sysdeps/powerpc/powerpc32/power4/memcmp.S | 1 +
> sysdeps/powerpc/powerpc32/power7/memcmp.S | 1 +
> sysdeps/powerpc/powerpc64/le/power10/memcmp.S | 1 +
> sysdeps/powerpc/powerpc64/power4/memcmp.S | 1 +
> sysdeps/powerpc/powerpc64/power7/memcmp.S | 1 +
> sysdeps/powerpc/powerpc64/power8/memcmp.S | 1 +
> sysdeps/s390/memcmp-z900.S | 1 +
> sysdeps/s390/memcmp.c | 1 +
> sysdeps/sparc/sparc64/memcmp.S | 2 ++
> sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/arc/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/arm/be/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/csky/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/i386/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/ia64/libc.abilist | 1 +
> .../unix/sysv/linux/m68k/coldfire/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist | 1 +
> .../unix/sysv/linux/microblaze/be/libc.abilist | 1 +
> .../unix/sysv/linux/microblaze/le/libc.abilist | 1 +
> .../unix/sysv/linux/mips/mips32/fpu/libc.abilist | 1 +
> .../sysv/linux/mips/mips32/nofpu/libc.abilist | 1 +
> .../unix/sysv/linux/mips/mips64/n32/libc.abilist | 1 +
> .../unix/sysv/linux/mips/mips64/n64/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 +
> .../linux/powerpc/powerpc32/fpu/libc.abilist | 1 +
> .../linux/powerpc/powerpc32/nofpu/libc.abilist | 1 +
> .../sysv/linux/powerpc/powerpc64/be/libc.abilist | 1 +
> .../sysv/linux/powerpc/powerpc64/le/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist | 1 +
> .../unix/sysv/linux/s390/s390-32/libc.abilist | 1 +
> .../unix/sysv/linux/s390/s390-64/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/sh/be/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/sh/le/libc.abilist | 1 +
> .../unix/sysv/linux/sparc/sparc32/libc.abilist | 1 +
> .../unix/sysv/linux/sparc/sparc64/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/x86_64/64/libc.abilist | 1 +
> sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist | 1 +
> sysdeps/x86_64/memcmp.S | 3 +++
> sysdeps/x86_64/multiarch/memcmp.c | 2 ++
> 55 files changed, 95 insertions(+)
>
> diff --git a/string/Versions b/string/Versions
> index 298ecd401a..864c4cf7a4 100644
> --- a/string/Versions
> +++ b/string/Versions
> @@ -89,4 +89,7 @@ libc {
> sigdescr_np; sigabbrev_np;
> strerrordesc_np; strerrorname_np;
> }
> + GLIBC_2.35 {
> + __memcmpeq;
> + }
> }
> diff --git a/string/memcmp.c b/string/memcmp.c
> index 9b46d7a905..6e93a3128f 100644
> --- a/string/memcmp.c
> +++ b/string/memcmp.c
> @@ -358,4 +358,6 @@ libc_hidden_builtin_def(memcmp)
> #ifdef weak_alias
> # undef bcmp
> weak_alias (memcmp, bcmp)
> +# undef __memcmpeq
> +strong_alias (memcmp, __memcmpeq)
> #endif
> diff --git a/string/string.h b/string/string.h
> index b1b083edce..e70feeaeea 100644
> --- a/string/string.h
> +++ b/string/string.h
> @@ -64,6 +64,22 @@ extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1));
> extern int memcmp (const void *__s1, const void *__s2, size_t __n)
> __THROW __attribute_pure__ __nonnull ((1, 2));
>
> +/* Compare N bytes of S1 and S2. Return zero if S1 and S2 are equal.
> + Return some non-zero value otherwise.
> +
> + Essentially __memcmpeq has the exact same semantics as memcmp
> + except the return value is less constrained. memcmp is always a
> + correct implementation of __memcmpeq. As well !!memcmp, -memcmp,
> + or bcmp are correct implementations.
> +
> + __memcmpeq is meant to be used by compilers when memcmp return is
> + only used for its bolean value.
> +
> + __memcmpeq is declared only for use by compilers. Programs should
> + continue to use memcmp. */
> +extern int __memcmpeq (const void *__s1, const void *__s2, size_t __n)
> + __THROW __attribute_pure__ __nonnull ((1, 2));
> +
> /* Search N bytes of S for C. */
> #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
> extern "C++"
> diff --git a/string/tester.c b/string/tester.c
> index 778160ae6e..605b3f00f9 100644
> --- a/string/tester.c
> +++ b/string/tester.c
> @@ -1449,6 +1449,19 @@ test_bcmp (void)
> check(bcmp("abc", "def", 0) == 0, 8); /* Zero count. */
> }
>
> +static void
> +test_memcmpeq (void)
> +{
> + it = "__memcmpeq";
> + check (__memcmpeq ("a", "a", 1) == 0, 1); /* Identity. */
> + check (__memcmpeq ("abc", "abc", 3) == 0, 2); /* Multicharacter. */
> + check (__memcmpeq ("abcd", "abce", 4) != 0, 3); /* Honestly unequal. */
> + check (__memcmpeq ("abce", "abcd", 4) != 0, 4);
> + check (__memcmpeq ("alph", "beta", 4) != 0, 5);
> + check (__memcmpeq ("abce", "abcd", 3) == 0, 6); /* Count limited. */
> + check (__memcmpeq ("abc", "def", 0) == 0, 8); /* Zero count. */
> +}
> +
> static void
> test_strerror (void)
> {
> @@ -1611,6 +1624,9 @@ main (void)
> /* bcmp - somewhat like memcmp. */
> test_bcmp ();
>
> + /* __memcmpeq - somewhat like memcmp. */
> + test_memcmpeq ();
> +
> /* strndup. */
> test_strndup ();
>
> diff --git a/sysdeps/aarch64/memcmp.S b/sysdeps/aarch64/memcmp.S
> index c1937f6f5c..37f37b9191 100644
> --- a/sysdeps/aarch64/memcmp.S
> +++ b/sysdeps/aarch64/memcmp.S
> @@ -177,4 +177,6 @@ L(ret_0):
> END (memcmp)
> #undef bcmp
> weak_alias (memcmp, bcmp)
> +#undef __memcmpeq
> +strong_alias (memcmp, __memcmpeq)
> libc_hidden_builtin_def (memcmp)
> diff --git a/sysdeps/csky/abiv2/memcmp.S b/sysdeps/csky/abiv2/memcmp.S
> index 1560387618..2a4ae577b0 100644
> --- a/sysdeps/csky/abiv2/memcmp.S
> +++ b/sysdeps/csky/abiv2/memcmp.S
> @@ -138,5 +138,6 @@ ENTRY (memcmp)
> br .L_s1_aligned
> END (memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> libc_hidden_def (memcmp)
> .weak memcmp
> diff --git a/sysdeps/i386/i686/memcmp.S b/sysdeps/i386/i686/memcmp.S
> index b26b124fad..90266d904b 100644
> --- a/sysdeps/i386/i686/memcmp.S
> +++ b/sysdeps/i386/i686/memcmp.S
> @@ -405,4 +405,6 @@ L(table_32bytes) :
>
> #undef bcmp
> weak_alias (memcmp, bcmp)
> +#undef __memcmpeq
> +strong_alias (memcmp, __memcmpeq)
> libc_hidden_builtin_def (memcmp)
> diff --git a/sysdeps/i386/i686/multiarch/memcmp.c b/sysdeps/i386/i686/multiarch/memcmp.c
> index 6e058a8857..3b2815edbc 100644
> --- a/sysdeps/i386/i686/multiarch/memcmp.c
> +++ b/sysdeps/i386/i686/multiarch/memcmp.c
> @@ -29,4 +29,5 @@
> libc_ifunc_redirected (__redirect_memcmp, memcmp, IFUNC_SELECTOR ());
>
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> #endif
> diff --git a/sysdeps/i386/memcmp.S b/sysdeps/i386/memcmp.S
> index 1f212b0f6d..02473c2c0c 100644
> --- a/sysdeps/i386/memcmp.S
> +++ b/sysdeps/i386/memcmp.S
> @@ -70,4 +70,6 @@ END (memcmp)
>
> #undef bcmp
> weak_alias (memcmp, bcmp)
> +#undef __memcmpeq
> +strong_alias (memcmp, __memcmpeq)
> libc_hidden_builtin_def (memcmp)
> diff --git a/sysdeps/ia64/memcmp.S b/sysdeps/ia64/memcmp.S
> index 97539c23fd..7722908751 100644
> --- a/sysdeps/ia64/memcmp.S
> +++ b/sysdeps/ia64/memcmp.S
> @@ -160,4 +160,5 @@ ENTRY(memcmp)
> END(memcmp)
>
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> libc_hidden_builtin_def (memcmp)
> diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist
> index c5da10a0cd..e849d6fa35 100644
> --- a/sysdeps/mach/hurd/i386/libc.abilist
> +++ b/sysdeps/mach/hurd/i386/libc.abilist
> @@ -2285,6 +2285,7 @@ GLIBC_2.34 res_send F
> GLIBC_2.34 shm_open F
> GLIBC_2.34 shm_unlink F
> GLIBC_2.34 timespec_getres F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/powerpc/powerpc32/405/memcmp.S b/sysdeps/powerpc/powerpc32/405/memcmp.S
> index 6a6a54d90f..c2836040a7 100644
> --- a/sysdeps/powerpc/powerpc32/405/memcmp.S
> +++ b/sysdeps/powerpc/powerpc32/405/memcmp.S
> @@ -126,3 +126,4 @@ L(st2):
> END (memcmp)
> libc_hidden_builtin_def (memcmp)
> weak_alias (memcmp,bcmp)
> +strong_alias (memcmp, __memcmpeq)
> diff --git a/sysdeps/powerpc/powerpc32/power4/memcmp.S b/sysdeps/powerpc/powerpc32/power4/memcmp.S
> index 814d2f211d..f58e34aba5 100644
> --- a/sysdeps/powerpc/powerpc32/power4/memcmp.S
> +++ b/sysdeps/powerpc/powerpc32/power4/memcmp.S
> @@ -1373,3 +1373,4 @@ END (memcmp)
>
> libc_hidden_builtin_def (memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> diff --git a/sysdeps/powerpc/powerpc32/power7/memcmp.S b/sysdeps/powerpc/powerpc32/power7/memcmp.S
> index 8a19953e2d..f8deb4e32c 100644
> --- a/sysdeps/powerpc/powerpc32/power7/memcmp.S
> +++ b/sysdeps/powerpc/powerpc32/power7/memcmp.S
> @@ -1373,3 +1373,4 @@ END (memcmp)
>
> libc_hidden_builtin_def (memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> diff --git a/sysdeps/powerpc/powerpc64/le/power10/memcmp.S b/sysdeps/powerpc/powerpc64/le/power10/memcmp.S
> index 52f244e7e7..f81c73a29c 100644
> --- a/sysdeps/powerpc/powerpc64/le/power10/memcmp.S
> +++ b/sysdeps/powerpc/powerpc64/le/power10/memcmp.S
> @@ -177,3 +177,4 @@ L(tail8):
> END (MEMCMP)
> libc_hidden_builtin_def (memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> diff --git a/sysdeps/powerpc/powerpc64/power4/memcmp.S b/sysdeps/powerpc/powerpc64/power4/memcmp.S
> index dc1be3a0d8..cc82be115f 100644
> --- a/sysdeps/powerpc/powerpc64/power4/memcmp.S
> +++ b/sysdeps/powerpc/powerpc64/power4/memcmp.S
> @@ -1374,3 +1374,4 @@ L(duzeroLength):
> END (MEMCMP)
> libc_hidden_builtin_def (memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> diff --git a/sysdeps/powerpc/powerpc64/power7/memcmp.S b/sysdeps/powerpc/powerpc64/power7/memcmp.S
> index bc034a55bc..3044f7ede9 100644
> --- a/sysdeps/powerpc/powerpc64/power7/memcmp.S
> +++ b/sysdeps/powerpc/powerpc64/power7/memcmp.S
> @@ -1059,3 +1059,4 @@ L(duzeroLength):
> END (MEMCMP)
> libc_hidden_builtin_def (memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> diff --git a/sysdeps/powerpc/powerpc64/power8/memcmp.S b/sysdeps/powerpc/powerpc64/power8/memcmp.S
> index b676b09a9b..0c6a154502 100644
> --- a/sysdeps/powerpc/powerpc64/power8/memcmp.S
> +++ b/sysdeps/powerpc/powerpc64/power8/memcmp.S
> @@ -1442,3 +1442,4 @@ L(duzeroLength):
> END (MEMCMP)
> libc_hidden_builtin_def (memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> diff --git a/sysdeps/s390/memcmp-z900.S b/sysdeps/s390/memcmp-z900.S
> index 995d52e47d..d625bf90dd 100644
> --- a/sysdeps/s390/memcmp-z900.S
> +++ b/sysdeps/s390/memcmp-z900.S
> @@ -164,6 +164,7 @@ END(MEMCMP_Z196)
> Otherwise see sysdeps/s390/memcmp.c. */
> strong_alias (MEMCMP_DEFAULT, memcmp)
> weak_alias (memcmp, bcmp)
> +strong_alias (memcmp, __memcmpeq)
> #endif
>
> #if defined SHARED && IS_IN (libc)
> diff --git a/sysdeps/s390/memcmp.c b/sysdeps/s390/memcmp.c
> index 0b4e9da717..52c20af772 100644
> --- a/sysdeps/s390/memcmp.c
> +++ b/sysdeps/s390/memcmp.c
> @@ -46,4 +46,5 @@ s390_libc_ifunc_expr (__redirect_memcmp, memcmp,
> })
> )
> weak_alias (memcmp, bcmp);
> +strong_alias (memcmp, __memcmpeq)
> #endif
> diff --git a/sysdeps/sparc/sparc64/memcmp.S b/sysdeps/sparc/sparc64/memcmp.S
> index d8d9ff9b24..fefeee5f5d 100644
> --- a/sysdeps/sparc/sparc64/memcmp.S
> +++ b/sysdeps/sparc/sparc64/memcmp.S
> @@ -137,4 +137,6 @@ END(memcmp)
>
> #undef bcmp
> weak_alias (memcmp, bcmp)
> +#undef __memcmpeq
> +strong_alias (memcmp, __memcmpeq)
> libc_hidden_builtin_def (memcmp)
> diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> index 21a2e50a88..f227ae6cee 100644
> --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> @@ -2612,3 +2612,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> index a201fd69ba..0ccc3fc73e 100644
> --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> @@ -2709,6 +2709,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist
> index 2611436937..fd80704787 100644
> --- a/sysdeps/unix/sysv/linux/arc/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/arc/libc.abilist
> @@ -2373,3 +2373,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> index a426241965..2ae6c58b8a 100644
> --- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> @@ -491,6 +491,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _Exit F
> GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
> GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
> diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> index 02f80418cc..fcfd1e8594 100644
> --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> @@ -488,6 +488,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _Exit F
> GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
> GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
> diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist
> index b7676eb372..ba034b8541 100644
> --- a/sysdeps/unix/sysv/linux/csky/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist
> @@ -2647,3 +2647,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> index f6965c9d95..b7460bec8a 100644
> --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> @@ -2596,6 +2596,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
> index 2e7603d9ed..a4dc341ded 100644
> --- a/sysdeps/unix/sysv/linux/i386/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
> @@ -2780,6 +2780,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> index dd3a56d3fe..94b222dbc7 100644
> --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> @@ -2547,6 +2547,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> index c1e0ea9c10..12fd3b6310 100644
> --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> @@ -492,6 +492,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _Exit F
> GLIBC_2.4 _IO_2_1_stderr_ D 0x98
> GLIBC_2.4 _IO_2_1_stdin_ D 0x98
> diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> index 93161048ca..4d2296007a 100644
> --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> @@ -2723,6 +2723,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> index 0aaeec8a27..a223278a3d 100644
> --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> @@ -2696,3 +2696,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> index bec5f456c9..780a4f5b0b 100644
> --- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> @@ -2693,3 +2693,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> index 97d2127f78..cd65136062 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> @@ -2688,6 +2688,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> index acb0756c11..b5b9902db5 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> @@ -2686,6 +2686,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> index ebc21dde1e..57593d5f94 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> @@ -2694,6 +2694,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> index c68f7e3c6c..e944d76bed 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> @@ -2598,6 +2598,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> index e5b6834f14..8af5a3a90d 100644
> --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> @@ -2735,3 +2735,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> index 132707c8ad..3a0213b39f 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> @@ -2750,6 +2750,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> index 0af2be31a0..f57df0234b 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> @@ -2783,6 +2783,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> index cf864632d0..259a0cfc51 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> @@ -2506,6 +2506,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> index d566d675d0..126541daf1 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> @@ -2808,3 +2808,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> index c9a7eacb32..05df4d13d2 100644
> --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> @@ -2375,3 +2375,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> index 8299131cb2..8e349cbff8 100644
> --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> @@ -2575,3 +2575,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> index c3fe78f77f..e9de402766 100644
> --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> @@ -2748,6 +2748,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> index 83e542aa8c..1a010c745d 100644
> --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> @@ -2543,6 +2543,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> index dc502f6833..22ce530975 100644
> --- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> @@ -2603,6 +2603,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> index cba1abb556..960df07b83 100644
> --- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> @@ -2600,6 +2600,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> index d4a516fb47..eedb376f3d 100644
> --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> @@ -2743,6 +2743,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 _IO_fprintf F
> GLIBC_2.4 _IO_printf F
> GLIBC_2.4 _IO_sprintf F
> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> index 6268875ba3..86e0c92bef 100644
> --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> @@ -2570,6 +2570,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> index 095e914b73..5e59d90623 100644
> --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> @@ -2521,6 +2521,7 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> GLIBC_2.4 __confstr_chk F
> GLIBC_2.4 __fgets_chk F
> GLIBC_2.4 __fgets_unlocked_chk F
> diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> index dd910f7fe9..94412dc134 100644
> --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> @@ -2627,3 +2627,4 @@ GLIBC_2.34 tss_create F
> GLIBC_2.34 tss_delete F
> GLIBC_2.34 tss_get F
> GLIBC_2.34 tss_set F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/x86_64/memcmp.S b/sysdeps/x86_64/memcmp.S
> index 870e15c5a0..f60ddb2ed1 100644
> --- a/sysdeps/x86_64/memcmp.S
> +++ b/sysdeps/x86_64/memcmp.S
> @@ -358,4 +358,7 @@ END(memcmp)
>
> #undef bcmp
> weak_alias (memcmp, bcmp)
> +/* Weak alias for __memcmpeq here as it will be preempted by
> + definition coming from IFUNC in multiarch/memcmp.c. */
> +weak_alias (memcmp, __memcmpeq)
> libc_hidden_builtin_def (memcmp)
> diff --git a/sysdeps/x86_64/multiarch/memcmp.c b/sysdeps/x86_64/multiarch/memcmp.c
> index fe725f3563..4a3aad2c9c 100644
> --- a/sysdeps/x86_64/multiarch/memcmp.c
> +++ b/sysdeps/x86_64/multiarch/memcmp.c
> @@ -29,6 +29,8 @@
> libc_ifunc_redirected (__redirect_memcmp, memcmp, IFUNC_SELECTOR ());
> # undef bcmp
> weak_alias (memcmp, bcmp)
> +# undef __memcmpeq
> +strong_alias (memcmp, __memcmpeq)
>
> # ifdef SHARED
> __hidden_ver1 (memcmp, __GI_memcmp, __redirect_memcmp)
> --
> 2.25.1
>
On Fri, Oct 22, 2021 at 12:19 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
>
> On Fri, Oct 22, 2021 at 12:51 AM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> >
> > No bug.
> >
> > This commit adds support for __memcmpeq() as a new ABI for all
> > targets. In this commit __memcmpeq() is implemented only as an alias
> > to the corresponding targets memcmp() implementation. __memcmpeq() is
> > added as a new symbol starting with GLIBC_2.35 and defined in string.h
> > with comments explaining its behavior. Basic tests that it is callable
> > and works where added in string/tester.c
> >
> > As discussed in the proposal "Add new ABI '__memcmpeq()' to libc"
> > __memcmpeq() is essentially a reserved namespace for bcmp(). The means
> > is shares the same specifications as memcmp() except the return value
> > for non-equal byte sequences is any non-zero value. This is less
> > strict than memcmp()'s return value specification and can be better
> > optimized when a boolean return is all that is needed.
> >
> > __memcmpeq() is meant to only be called by compilers if they can prove
> > that the return value of a memcmp() call is only used for its boolean
> > value.
> >
> > All tests in string/tester.c passed. As well build succeeds on
> > x86_64-linux-gnu target.
> > ---
> > Kept one weak alias in in:
> > sysdeps/x86_64/memcmp.S
> >
> > This will be preempted by the strong_alias in:
> > sysdeps/x86_64/multiarch/memcmp.c
>
> This issue is present on some other builds. Fixing.
Should the check on --disable-multi-arch also include
IS_IN (LIBC)?
>
> >
> > string/Versions | 3 +++
> > string/memcmp.c | 2 ++
> > string/string.h | 16 ++++++++++++++++
> > string/tester.c | 16 ++++++++++++++++
> > sysdeps/aarch64/memcmp.S | 2 ++
> > sysdeps/csky/abiv2/memcmp.S | 1 +
> > sysdeps/i386/i686/memcmp.S | 2 ++
> > sysdeps/i386/i686/multiarch/memcmp.c | 1 +
> > sysdeps/i386/memcmp.S | 2 ++
> > sysdeps/ia64/memcmp.S | 1 +
> > sysdeps/mach/hurd/i386/libc.abilist | 1 +
> > sysdeps/powerpc/powerpc32/405/memcmp.S | 1 +
> > sysdeps/powerpc/powerpc32/power4/memcmp.S | 1 +
> > sysdeps/powerpc/powerpc32/power7/memcmp.S | 1 +
> > sysdeps/powerpc/powerpc64/le/power10/memcmp.S | 1 +
> > sysdeps/powerpc/powerpc64/power4/memcmp.S | 1 +
> > sysdeps/powerpc/powerpc64/power7/memcmp.S | 1 +
> > sysdeps/powerpc/powerpc64/power8/memcmp.S | 1 +
> > sysdeps/s390/memcmp-z900.S | 1 +
> > sysdeps/s390/memcmp.c | 1 +
> > sysdeps/sparc/sparc64/memcmp.S | 2 ++
> > sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/arc/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/arm/be/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/csky/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/i386/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/ia64/libc.abilist | 1 +
> > .../unix/sysv/linux/m68k/coldfire/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist | 1 +
> > .../unix/sysv/linux/microblaze/be/libc.abilist | 1 +
> > .../unix/sysv/linux/microblaze/le/libc.abilist | 1 +
> > .../unix/sysv/linux/mips/mips32/fpu/libc.abilist | 1 +
> > .../sysv/linux/mips/mips32/nofpu/libc.abilist | 1 +
> > .../unix/sysv/linux/mips/mips64/n32/libc.abilist | 1 +
> > .../unix/sysv/linux/mips/mips64/n64/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 +
> > .../linux/powerpc/powerpc32/fpu/libc.abilist | 1 +
> > .../linux/powerpc/powerpc32/nofpu/libc.abilist | 1 +
> > .../sysv/linux/powerpc/powerpc64/be/libc.abilist | 1 +
> > .../sysv/linux/powerpc/powerpc64/le/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist | 1 +
> > .../unix/sysv/linux/s390/s390-32/libc.abilist | 1 +
> > .../unix/sysv/linux/s390/s390-64/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/sh/be/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/sh/le/libc.abilist | 1 +
> > .../unix/sysv/linux/sparc/sparc32/libc.abilist | 1 +
> > .../unix/sysv/linux/sparc/sparc64/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/x86_64/64/libc.abilist | 1 +
> > sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist | 1 +
> > sysdeps/x86_64/memcmp.S | 3 +++
> > sysdeps/x86_64/multiarch/memcmp.c | 2 ++
> > 55 files changed, 95 insertions(+)
> >
> > diff --git a/string/Versions b/string/Versions
> > index 298ecd401a..864c4cf7a4 100644
> > --- a/string/Versions
> > +++ b/string/Versions
> > @@ -89,4 +89,7 @@ libc {
> > sigdescr_np; sigabbrev_np;
> > strerrordesc_np; strerrorname_np;
> > }
> > + GLIBC_2.35 {
> > + __memcmpeq;
> > + }
> > }
> > diff --git a/string/memcmp.c b/string/memcmp.c
> > index 9b46d7a905..6e93a3128f 100644
> > --- a/string/memcmp.c
> > +++ b/string/memcmp.c
> > @@ -358,4 +358,6 @@ libc_hidden_builtin_def(memcmp)
> > #ifdef weak_alias
> > # undef bcmp
> > weak_alias (memcmp, bcmp)
> > +# undef __memcmpeq
> > +strong_alias (memcmp, __memcmpeq)
> > #endif
> > diff --git a/string/string.h b/string/string.h
> > index b1b083edce..e70feeaeea 100644
> > --- a/string/string.h
> > +++ b/string/string.h
> > @@ -64,6 +64,22 @@ extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1));
> > extern int memcmp (const void *__s1, const void *__s2, size_t __n)
> > __THROW __attribute_pure__ __nonnull ((1, 2));
> >
> > +/* Compare N bytes of S1 and S2. Return zero if S1 and S2 are equal.
> > + Return some non-zero value otherwise.
> > +
> > + Essentially __memcmpeq has the exact same semantics as memcmp
> > + except the return value is less constrained. memcmp is always a
> > + correct implementation of __memcmpeq. As well !!memcmp, -memcmp,
> > + or bcmp are correct implementations.
> > +
> > + __memcmpeq is meant to be used by compilers when memcmp return is
> > + only used for its bolean value.
> > +
> > + __memcmpeq is declared only for use by compilers. Programs should
> > + continue to use memcmp. */
> > +extern int __memcmpeq (const void *__s1, const void *__s2, size_t __n)
> > + __THROW __attribute_pure__ __nonnull ((1, 2));
> > +
> > /* Search N bytes of S for C. */
> > #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
> > extern "C++"
> > diff --git a/string/tester.c b/string/tester.c
> > index 778160ae6e..605b3f00f9 100644
> > --- a/string/tester.c
> > +++ b/string/tester.c
> > @@ -1449,6 +1449,19 @@ test_bcmp (void)
> > check(bcmp("abc", "def", 0) == 0, 8); /* Zero count. */
> > }
> >
> > +static void
> > +test_memcmpeq (void)
> > +{
> > + it = "__memcmpeq";
> > + check (__memcmpeq ("a", "a", 1) == 0, 1); /* Identity. */
> > + check (__memcmpeq ("abc", "abc", 3) == 0, 2); /* Multicharacter. */
> > + check (__memcmpeq ("abcd", "abce", 4) != 0, 3); /* Honestly unequal. */
> > + check (__memcmpeq ("abce", "abcd", 4) != 0, 4);
> > + check (__memcmpeq ("alph", "beta", 4) != 0, 5);
> > + check (__memcmpeq ("abce", "abcd", 3) == 0, 6); /* Count limited. */
> > + check (__memcmpeq ("abc", "def", 0) == 0, 8); /* Zero count. */
> > +}
> > +
> > static void
> > test_strerror (void)
> > {
> > @@ -1611,6 +1624,9 @@ main (void)
> > /* bcmp - somewhat like memcmp. */
> > test_bcmp ();
> >
> > + /* __memcmpeq - somewhat like memcmp. */
> > + test_memcmpeq ();
> > +
> > /* strndup. */
> > test_strndup ();
> >
> > diff --git a/sysdeps/aarch64/memcmp.S b/sysdeps/aarch64/memcmp.S
> > index c1937f6f5c..37f37b9191 100644
> > --- a/sysdeps/aarch64/memcmp.S
> > +++ b/sysdeps/aarch64/memcmp.S
> > @@ -177,4 +177,6 @@ L(ret_0):
> > END (memcmp)
> > #undef bcmp
> > weak_alias (memcmp, bcmp)
> > +#undef __memcmpeq
> > +strong_alias (memcmp, __memcmpeq)
> > libc_hidden_builtin_def (memcmp)
> > diff --git a/sysdeps/csky/abiv2/memcmp.S b/sysdeps/csky/abiv2/memcmp.S
> > index 1560387618..2a4ae577b0 100644
> > --- a/sysdeps/csky/abiv2/memcmp.S
> > +++ b/sysdeps/csky/abiv2/memcmp.S
> > @@ -138,5 +138,6 @@ ENTRY (memcmp)
> > br .L_s1_aligned
> > END (memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > libc_hidden_def (memcmp)
> > .weak memcmp
> > diff --git a/sysdeps/i386/i686/memcmp.S b/sysdeps/i386/i686/memcmp.S
> > index b26b124fad..90266d904b 100644
> > --- a/sysdeps/i386/i686/memcmp.S
> > +++ b/sysdeps/i386/i686/memcmp.S
> > @@ -405,4 +405,6 @@ L(table_32bytes) :
> >
> > #undef bcmp
> > weak_alias (memcmp, bcmp)
> > +#undef __memcmpeq
> > +strong_alias (memcmp, __memcmpeq)
> > libc_hidden_builtin_def (memcmp)
> > diff --git a/sysdeps/i386/i686/multiarch/memcmp.c b/sysdeps/i386/i686/multiarch/memcmp.c
> > index 6e058a8857..3b2815edbc 100644
> > --- a/sysdeps/i386/i686/multiarch/memcmp.c
> > +++ b/sysdeps/i386/i686/multiarch/memcmp.c
> > @@ -29,4 +29,5 @@
> > libc_ifunc_redirected (__redirect_memcmp, memcmp, IFUNC_SELECTOR ());
> >
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > #endif
> > diff --git a/sysdeps/i386/memcmp.S b/sysdeps/i386/memcmp.S
> > index 1f212b0f6d..02473c2c0c 100644
> > --- a/sysdeps/i386/memcmp.S
> > +++ b/sysdeps/i386/memcmp.S
> > @@ -70,4 +70,6 @@ END (memcmp)
> >
> > #undef bcmp
> > weak_alias (memcmp, bcmp)
> > +#undef __memcmpeq
> > +strong_alias (memcmp, __memcmpeq)
> > libc_hidden_builtin_def (memcmp)
> > diff --git a/sysdeps/ia64/memcmp.S b/sysdeps/ia64/memcmp.S
> > index 97539c23fd..7722908751 100644
> > --- a/sysdeps/ia64/memcmp.S
> > +++ b/sysdeps/ia64/memcmp.S
> > @@ -160,4 +160,5 @@ ENTRY(memcmp)
> > END(memcmp)
> >
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > libc_hidden_builtin_def (memcmp)
> > diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist
> > index c5da10a0cd..e849d6fa35 100644
> > --- a/sysdeps/mach/hurd/i386/libc.abilist
> > +++ b/sysdeps/mach/hurd/i386/libc.abilist
> > @@ -2285,6 +2285,7 @@ GLIBC_2.34 res_send F
> > GLIBC_2.34 shm_open F
> > GLIBC_2.34 shm_unlink F
> > GLIBC_2.34 timespec_getres F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/powerpc/powerpc32/405/memcmp.S b/sysdeps/powerpc/powerpc32/405/memcmp.S
> > index 6a6a54d90f..c2836040a7 100644
> > --- a/sysdeps/powerpc/powerpc32/405/memcmp.S
> > +++ b/sysdeps/powerpc/powerpc32/405/memcmp.S
> > @@ -126,3 +126,4 @@ L(st2):
> > END (memcmp)
> > libc_hidden_builtin_def (memcmp)
> > weak_alias (memcmp,bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > diff --git a/sysdeps/powerpc/powerpc32/power4/memcmp.S b/sysdeps/powerpc/powerpc32/power4/memcmp.S
> > index 814d2f211d..f58e34aba5 100644
> > --- a/sysdeps/powerpc/powerpc32/power4/memcmp.S
> > +++ b/sysdeps/powerpc/powerpc32/power4/memcmp.S
> > @@ -1373,3 +1373,4 @@ END (memcmp)
> >
> > libc_hidden_builtin_def (memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > diff --git a/sysdeps/powerpc/powerpc32/power7/memcmp.S b/sysdeps/powerpc/powerpc32/power7/memcmp.S
> > index 8a19953e2d..f8deb4e32c 100644
> > --- a/sysdeps/powerpc/powerpc32/power7/memcmp.S
> > +++ b/sysdeps/powerpc/powerpc32/power7/memcmp.S
> > @@ -1373,3 +1373,4 @@ END (memcmp)
> >
> > libc_hidden_builtin_def (memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > diff --git a/sysdeps/powerpc/powerpc64/le/power10/memcmp.S b/sysdeps/powerpc/powerpc64/le/power10/memcmp.S
> > index 52f244e7e7..f81c73a29c 100644
> > --- a/sysdeps/powerpc/powerpc64/le/power10/memcmp.S
> > +++ b/sysdeps/powerpc/powerpc64/le/power10/memcmp.S
> > @@ -177,3 +177,4 @@ L(tail8):
> > END (MEMCMP)
> > libc_hidden_builtin_def (memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > diff --git a/sysdeps/powerpc/powerpc64/power4/memcmp.S b/sysdeps/powerpc/powerpc64/power4/memcmp.S
> > index dc1be3a0d8..cc82be115f 100644
> > --- a/sysdeps/powerpc/powerpc64/power4/memcmp.S
> > +++ b/sysdeps/powerpc/powerpc64/power4/memcmp.S
> > @@ -1374,3 +1374,4 @@ L(duzeroLength):
> > END (MEMCMP)
> > libc_hidden_builtin_def (memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > diff --git a/sysdeps/powerpc/powerpc64/power7/memcmp.S b/sysdeps/powerpc/powerpc64/power7/memcmp.S
> > index bc034a55bc..3044f7ede9 100644
> > --- a/sysdeps/powerpc/powerpc64/power7/memcmp.S
> > +++ b/sysdeps/powerpc/powerpc64/power7/memcmp.S
> > @@ -1059,3 +1059,4 @@ L(duzeroLength):
> > END (MEMCMP)
> > libc_hidden_builtin_def (memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > diff --git a/sysdeps/powerpc/powerpc64/power8/memcmp.S b/sysdeps/powerpc/powerpc64/power8/memcmp.S
> > index b676b09a9b..0c6a154502 100644
> > --- a/sysdeps/powerpc/powerpc64/power8/memcmp.S
> > +++ b/sysdeps/powerpc/powerpc64/power8/memcmp.S
> > @@ -1442,3 +1442,4 @@ L(duzeroLength):
> > END (MEMCMP)
> > libc_hidden_builtin_def (memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > diff --git a/sysdeps/s390/memcmp-z900.S b/sysdeps/s390/memcmp-z900.S
> > index 995d52e47d..d625bf90dd 100644
> > --- a/sysdeps/s390/memcmp-z900.S
> > +++ b/sysdeps/s390/memcmp-z900.S
> > @@ -164,6 +164,7 @@ END(MEMCMP_Z196)
> > Otherwise see sysdeps/s390/memcmp.c. */
> > strong_alias (MEMCMP_DEFAULT, memcmp)
> > weak_alias (memcmp, bcmp)
> > +strong_alias (memcmp, __memcmpeq)
> > #endif
> >
> > #if defined SHARED && IS_IN (libc)
> > diff --git a/sysdeps/s390/memcmp.c b/sysdeps/s390/memcmp.c
> > index 0b4e9da717..52c20af772 100644
> > --- a/sysdeps/s390/memcmp.c
> > +++ b/sysdeps/s390/memcmp.c
> > @@ -46,4 +46,5 @@ s390_libc_ifunc_expr (__redirect_memcmp, memcmp,
> > })
> > )
> > weak_alias (memcmp, bcmp);
> > +strong_alias (memcmp, __memcmpeq)
> > #endif
> > diff --git a/sysdeps/sparc/sparc64/memcmp.S b/sysdeps/sparc/sparc64/memcmp.S
> > index d8d9ff9b24..fefeee5f5d 100644
> > --- a/sysdeps/sparc/sparc64/memcmp.S
> > +++ b/sysdeps/sparc/sparc64/memcmp.S
> > @@ -137,4 +137,6 @@ END(memcmp)
> >
> > #undef bcmp
> > weak_alias (memcmp, bcmp)
> > +#undef __memcmpeq
> > +strong_alias (memcmp, __memcmpeq)
> > libc_hidden_builtin_def (memcmp)
> > diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> > index 21a2e50a88..f227ae6cee 100644
> > --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> > @@ -2612,3 +2612,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> > index a201fd69ba..0ccc3fc73e 100644
> > --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> > @@ -2709,6 +2709,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _IO_fprintf F
> > GLIBC_2.4 _IO_printf F
> > GLIBC_2.4 _IO_sprintf F
> > diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist
> > index 2611436937..fd80704787 100644
> > --- a/sysdeps/unix/sysv/linux/arc/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/arc/libc.abilist
> > @@ -2373,3 +2373,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> > index a426241965..2ae6c58b8a 100644
> > --- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
> > @@ -491,6 +491,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _Exit F
> > GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
> > GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
> > diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> > index 02f80418cc..fcfd1e8594 100644
> > --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
> > @@ -488,6 +488,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _Exit F
> > GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
> > GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
> > diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist
> > index b7676eb372..ba034b8541 100644
> > --- a/sysdeps/unix/sysv/linux/csky/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist
> > @@ -2647,3 +2647,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> > index f6965c9d95..b7460bec8a 100644
> > --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> > @@ -2596,6 +2596,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
> > index 2e7603d9ed..a4dc341ded 100644
> > --- a/sysdeps/unix/sysv/linux/i386/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
> > @@ -2780,6 +2780,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> > index dd3a56d3fe..94b222dbc7 100644
> > --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> > @@ -2547,6 +2547,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> > index c1e0ea9c10..12fd3b6310 100644
> > --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> > @@ -492,6 +492,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _Exit F
> > GLIBC_2.4 _IO_2_1_stderr_ D 0x98
> > GLIBC_2.4 _IO_2_1_stdin_ D 0x98
> > diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> > index 93161048ca..4d2296007a 100644
> > --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> > @@ -2723,6 +2723,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> > index 0aaeec8a27..a223278a3d 100644
> > --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
> > @@ -2696,3 +2696,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> > index bec5f456c9..780a4f5b0b 100644
> > --- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
> > @@ -2693,3 +2693,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> > index 97d2127f78..cd65136062 100644
> > --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> > @@ -2688,6 +2688,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> > index acb0756c11..b5b9902db5 100644
> > --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> > @@ -2686,6 +2686,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> > index ebc21dde1e..57593d5f94 100644
> > --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> > @@ -2694,6 +2694,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> > index c68f7e3c6c..e944d76bed 100644
> > --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> > @@ -2598,6 +2598,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> > index e5b6834f14..8af5a3a90d 100644
> > --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> > @@ -2735,3 +2735,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> > index 132707c8ad..3a0213b39f 100644
> > --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> > @@ -2750,6 +2750,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _IO_fprintf F
> > GLIBC_2.4 _IO_printf F
> > GLIBC_2.4 _IO_sprintf F
> > diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> > index 0af2be31a0..f57df0234b 100644
> > --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> > @@ -2783,6 +2783,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _IO_fprintf F
> > GLIBC_2.4 _IO_printf F
> > GLIBC_2.4 _IO_sprintf F
> > diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> > index cf864632d0..259a0cfc51 100644
> > --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
> > @@ -2506,6 +2506,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _IO_fprintf F
> > GLIBC_2.4 _IO_printf F
> > GLIBC_2.4 _IO_sprintf F
> > diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> > index d566d675d0..126541daf1 100644
> > --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
> > @@ -2808,3 +2808,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> > index c9a7eacb32..05df4d13d2 100644
> > --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
> > @@ -2375,3 +2375,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> > index 8299131cb2..8e349cbff8 100644
> > --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
> > @@ -2575,3 +2575,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> > index c3fe78f77f..e9de402766 100644
> > --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> > @@ -2748,6 +2748,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _IO_fprintf F
> > GLIBC_2.4 _IO_printf F
> > GLIBC_2.4 _IO_sprintf F
> > diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> > index 83e542aa8c..1a010c745d 100644
> > --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> > @@ -2543,6 +2543,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _IO_fprintf F
> > GLIBC_2.4 _IO_printf F
> > GLIBC_2.4 _IO_sprintf F
> > diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> > index dc502f6833..22ce530975 100644
> > --- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
> > @@ -2603,6 +2603,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> > index cba1abb556..960df07b83 100644
> > --- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
> > @@ -2600,6 +2600,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> > index d4a516fb47..eedb376f3d 100644
> > --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> > @@ -2743,6 +2743,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 _IO_fprintf F
> > GLIBC_2.4 _IO_printf F
> > GLIBC_2.4 _IO_sprintf F
> > diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> > index 6268875ba3..86e0c92bef 100644
> > --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> > @@ -2570,6 +2570,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> > index 095e914b73..5e59d90623 100644
> > --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> > @@ -2521,6 +2521,7 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > GLIBC_2.4 __confstr_chk F
> > GLIBC_2.4 __fgets_chk F
> > GLIBC_2.4 __fgets_unlocked_chk F
> > diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> > index dd910f7fe9..94412dc134 100644
> > --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> > @@ -2627,3 +2627,4 @@ GLIBC_2.34 tss_create F
> > GLIBC_2.34 tss_delete F
> > GLIBC_2.34 tss_get F
> > GLIBC_2.34 tss_set F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/x86_64/memcmp.S b/sysdeps/x86_64/memcmp.S
> > index 870e15c5a0..f60ddb2ed1 100644
> > --- a/sysdeps/x86_64/memcmp.S
> > +++ b/sysdeps/x86_64/memcmp.S
> > @@ -358,4 +358,7 @@ END(memcmp)
> >
> > #undef bcmp
> > weak_alias (memcmp, bcmp)
> > +/* Weak alias for __memcmpeq here as it will be preempted by
> > + definition coming from IFUNC in multiarch/memcmp.c. */
> > +weak_alias (memcmp, __memcmpeq)
> > libc_hidden_builtin_def (memcmp)
> > diff --git a/sysdeps/x86_64/multiarch/memcmp.c b/sysdeps/x86_64/multiarch/memcmp.c
> > index fe725f3563..4a3aad2c9c 100644
> > --- a/sysdeps/x86_64/multiarch/memcmp.c
> > +++ b/sysdeps/x86_64/multiarch/memcmp.c
> > @@ -29,6 +29,8 @@
> > libc_ifunc_redirected (__redirect_memcmp, memcmp, IFUNC_SELECTOR ());
> > # undef bcmp
> > weak_alias (memcmp, bcmp)
> > +# undef __memcmpeq
> > +strong_alias (memcmp, __memcmpeq)
> >
> > # ifdef SHARED
> > __hidden_ver1 (memcmp, __GI_memcmp, __redirect_memcmp)
> > --
> > 2.25.1
> >
On Fri, Oct 22, 2021 at 10:41 AM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
>
> On Fri, Oct 22, 2021 at 12:19 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> >
> > On Fri, Oct 22, 2021 at 12:51 AM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> > >
> > > No bug.
> > >
> > > This commit adds support for __memcmpeq() as a new ABI for all
> > > targets. In this commit __memcmpeq() is implemented only as an alias
> > > to the corresponding targets memcmp() implementation. __memcmpeq() is
> > > added as a new symbol starting with GLIBC_2.35 and defined in string.h
> > > with comments explaining its behavior. Basic tests that it is callable
> > > and works where added in string/tester.c
> > >
> > > As discussed in the proposal "Add new ABI '__memcmpeq()' to libc"
> > > __memcmpeq() is essentially a reserved namespace for bcmp(). The means
> > > is shares the same specifications as memcmp() except the return value
> > > for non-equal byte sequences is any non-zero value. This is less
> > > strict than memcmp()'s return value specification and can be better
> > > optimized when a boolean return is all that is needed.
> > >
> > > __memcmpeq() is meant to only be called by compilers if they can prove
> > > that the return value of a memcmp() call is only used for its boolean
> > > value.
> > >
> > > All tests in string/tester.c passed. As well build succeeds on
> > > x86_64-linux-gnu target.
> > > ---
> > > Kept one weak alias in in:
> > > sysdeps/x86_64/memcmp.S
> > >
> > > This will be preempted by the strong_alias in:
> > > sysdeps/x86_64/multiarch/memcmp.c
> >
> > This issue is present on some other builds. Fixing.
>
> Should the check on --disable-multi-arch also include
> IS_IN (LIBC)?
Why? It can be used in ld.so.
On Fri, Oct 22, 2021 at 12:45 PM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> On Fri, Oct 22, 2021 at 10:41 AM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> >
> > On Fri, Oct 22, 2021 at 12:19 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> > >
> > > On Fri, Oct 22, 2021 at 12:51 AM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> > > >
> > > > No bug.
> > > >
> > > > This commit adds support for __memcmpeq() as a new ABI for all
> > > > targets. In this commit __memcmpeq() is implemented only as an alias
> > > > to the corresponding targets memcmp() implementation. __memcmpeq() is
> > > > added as a new symbol starting with GLIBC_2.35 and defined in string.h
> > > > with comments explaining its behavior. Basic tests that it is callable
> > > > and works where added in string/tester.c
> > > >
> > > > As discussed in the proposal "Add new ABI '__memcmpeq()' to libc"
> > > > __memcmpeq() is essentially a reserved namespace for bcmp(). The means
> > > > is shares the same specifications as memcmp() except the return value
> > > > for non-equal byte sequences is any non-zero value. This is less
> > > > strict than memcmp()'s return value specification and can be better
> > > > optimized when a boolean return is all that is needed.
> > > >
> > > > __memcmpeq() is meant to only be called by compilers if they can prove
> > > > that the return value of a memcmp() call is only used for its boolean
> > > > value.
> > > >
> > > > All tests in string/tester.c passed. As well build succeeds on
> > > > x86_64-linux-gnu target.
> > > > ---
> > > > Kept one weak alias in in:
> > > > sysdeps/x86_64/memcmp.S
> > > >
> > > > This will be preempted by the strong_alias in:
> > > > sysdeps/x86_64/multiarch/memcmp.c
> > >
> > > This issue is present on some other builds. Fixing.
> >
> > Should the check on --disable-multi-arch also include
> > IS_IN (LIBC)?
>
> Why? It can be used in ld.so.
Just looking at:
'#if ! HAVE_MEMCMP_IFUNC'
in memcmp-z900.S which requires
both.
>
> --
> H.J.
On Fri, Oct 22, 2021 at 11:09 AM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
>
> On Fri, Oct 22, 2021 at 12:45 PM H.J. Lu <hjl.tools@gmail.com> wrote:
> >
> > On Fri, Oct 22, 2021 at 10:41 AM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> > >
> > > On Fri, Oct 22, 2021 at 12:19 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> > > >
> > > > On Fri, Oct 22, 2021 at 12:51 AM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> > > > >
> > > > > No bug.
> > > > >
> > > > > This commit adds support for __memcmpeq() as a new ABI for all
> > > > > targets. In this commit __memcmpeq() is implemented only as an alias
> > > > > to the corresponding targets memcmp() implementation. __memcmpeq() is
> > > > > added as a new symbol starting with GLIBC_2.35 and defined in string.h
> > > > > with comments explaining its behavior. Basic tests that it is callable
> > > > > and works where added in string/tester.c
> > > > >
> > > > > As discussed in the proposal "Add new ABI '__memcmpeq()' to libc"
> > > > > __memcmpeq() is essentially a reserved namespace for bcmp(). The means
> > > > > is shares the same specifications as memcmp() except the return value
> > > > > for non-equal byte sequences is any non-zero value. This is less
> > > > > strict than memcmp()'s return value specification and can be better
> > > > > optimized when a boolean return is all that is needed.
> > > > >
> > > > > __memcmpeq() is meant to only be called by compilers if they can prove
> > > > > that the return value of a memcmp() call is only used for its boolean
> > > > > value.
> > > > >
> > > > > All tests in string/tester.c passed. As well build succeeds on
> > > > > x86_64-linux-gnu target.
> > > > > ---
> > > > > Kept one weak alias in in:
> > > > > sysdeps/x86_64/memcmp.S
> > > > >
> > > > > This will be preempted by the strong_alias in:
> > > > > sysdeps/x86_64/multiarch/memcmp.c
> > > >
> > > > This issue is present on some other builds. Fixing.
> > >
> > > Should the check on --disable-multi-arch also include
> > > IS_IN (LIBC)?
> >
> > Why? It can be used in ld.so.
>
> Just looking at:
> '#if ! HAVE_MEMCMP_IFUNC'
> in memcmp-z900.S which requires
> both.
Different targets have different requirements. For x86, it is
safe to use IFUNC for memcmp in ld.so, except when initializing
tunables.
@@ -89,4 +89,7 @@ libc {
sigdescr_np; sigabbrev_np;
strerrordesc_np; strerrorname_np;
}
+ GLIBC_2.35 {
+ __memcmpeq;
+ }
}
@@ -358,4 +358,6 @@ libc_hidden_builtin_def(memcmp)
#ifdef weak_alias
# undef bcmp
weak_alias (memcmp, bcmp)
+# undef __memcmpeq
+strong_alias (memcmp, __memcmpeq)
#endif
@@ -64,6 +64,22 @@ extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1));
extern int memcmp (const void *__s1, const void *__s2, size_t __n)
__THROW __attribute_pure__ __nonnull ((1, 2));
+/* Compare N bytes of S1 and S2. Return zero if S1 and S2 are equal.
+ Return some non-zero value otherwise.
+
+ Essentially __memcmpeq has the exact same semantics as memcmp
+ except the return value is less constrained. memcmp is always a
+ correct implementation of __memcmpeq. As well !!memcmp, -memcmp,
+ or bcmp are correct implementations.
+
+ __memcmpeq is meant to be used by compilers when memcmp return is
+ only used for its bolean value.
+
+ __memcmpeq is declared only for use by compilers. Programs should
+ continue to use memcmp. */
+extern int __memcmpeq (const void *__s1, const void *__s2, size_t __n)
+ __THROW __attribute_pure__ __nonnull ((1, 2));
+
/* Search N bytes of S for C. */
#ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
extern "C++"
@@ -1449,6 +1449,19 @@ test_bcmp (void)
check(bcmp("abc", "def", 0) == 0, 8); /* Zero count. */
}
+static void
+test_memcmpeq (void)
+{
+ it = "__memcmpeq";
+ check (__memcmpeq ("a", "a", 1) == 0, 1); /* Identity. */
+ check (__memcmpeq ("abc", "abc", 3) == 0, 2); /* Multicharacter. */
+ check (__memcmpeq ("abcd", "abce", 4) != 0, 3); /* Honestly unequal. */
+ check (__memcmpeq ("abce", "abcd", 4) != 0, 4);
+ check (__memcmpeq ("alph", "beta", 4) != 0, 5);
+ check (__memcmpeq ("abce", "abcd", 3) == 0, 6); /* Count limited. */
+ check (__memcmpeq ("abc", "def", 0) == 0, 8); /* Zero count. */
+}
+
static void
test_strerror (void)
{
@@ -1611,6 +1624,9 @@ main (void)
/* bcmp - somewhat like memcmp. */
test_bcmp ();
+ /* __memcmpeq - somewhat like memcmp. */
+ test_memcmpeq ();
+
/* strndup. */
test_strndup ();
@@ -177,4 +177,6 @@ L(ret_0):
END (memcmp)
#undef bcmp
weak_alias (memcmp, bcmp)
+#undef __memcmpeq
+strong_alias (memcmp, __memcmpeq)
libc_hidden_builtin_def (memcmp)
@@ -138,5 +138,6 @@ ENTRY (memcmp)
br .L_s1_aligned
END (memcmp)
weak_alias (memcmp, bcmp)
+strong_alias (memcmp, __memcmpeq)
libc_hidden_def (memcmp)
.weak memcmp
@@ -405,4 +405,6 @@ L(table_32bytes) :
#undef bcmp
weak_alias (memcmp, bcmp)
+#undef __memcmpeq
+strong_alias (memcmp, __memcmpeq)
libc_hidden_builtin_def (memcmp)
@@ -29,4 +29,5 @@
libc_ifunc_redirected (__redirect_memcmp, memcmp, IFUNC_SELECTOR ());
weak_alias (memcmp, bcmp)
+strong_alias (memcmp, __memcmpeq)
#endif
@@ -70,4 +70,6 @@ END (memcmp)
#undef bcmp
weak_alias (memcmp, bcmp)
+#undef __memcmpeq
+strong_alias (memcmp, __memcmpeq)
libc_hidden_builtin_def (memcmp)
@@ -160,4 +160,5 @@ ENTRY(memcmp)
END(memcmp)
weak_alias (memcmp, bcmp)
+strong_alias (memcmp, __memcmpeq)
libc_hidden_builtin_def (memcmp)
@@ -2285,6 +2285,7 @@ GLIBC_2.34 res_send F
GLIBC_2.34 shm_open F
GLIBC_2.34 shm_unlink F
GLIBC_2.34 timespec_getres F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -126,3 +126,4 @@ L(st2):
END (memcmp)
libc_hidden_builtin_def (memcmp)
weak_alias (memcmp,bcmp)
+strong_alias (memcmp, __memcmpeq)
@@ -1373,3 +1373,4 @@ END (memcmp)
libc_hidden_builtin_def (memcmp)
weak_alias (memcmp, bcmp)
+strong_alias (memcmp, __memcmpeq)
@@ -1373,3 +1373,4 @@ END (memcmp)
libc_hidden_builtin_def (memcmp)
weak_alias (memcmp, bcmp)
+strong_alias (memcmp, __memcmpeq)
@@ -177,3 +177,4 @@ L(tail8):
END (MEMCMP)
libc_hidden_builtin_def (memcmp)
weak_alias (memcmp, bcmp)
+strong_alias (memcmp, __memcmpeq)
@@ -1374,3 +1374,4 @@ L(duzeroLength):
END (MEMCMP)
libc_hidden_builtin_def (memcmp)
weak_alias (memcmp, bcmp)
+strong_alias (memcmp, __memcmpeq)
@@ -1059,3 +1059,4 @@ L(duzeroLength):
END (MEMCMP)
libc_hidden_builtin_def (memcmp)
weak_alias (memcmp, bcmp)
+strong_alias (memcmp, __memcmpeq)
@@ -1442,3 +1442,4 @@ L(duzeroLength):
END (MEMCMP)
libc_hidden_builtin_def (memcmp)
weak_alias (memcmp, bcmp)
+strong_alias (memcmp, __memcmpeq)
@@ -164,6 +164,7 @@ END(MEMCMP_Z196)
Otherwise see sysdeps/s390/memcmp.c. */
strong_alias (MEMCMP_DEFAULT, memcmp)
weak_alias (memcmp, bcmp)
+strong_alias (memcmp, __memcmpeq)
#endif
#if defined SHARED && IS_IN (libc)
@@ -46,4 +46,5 @@ s390_libc_ifunc_expr (__redirect_memcmp, memcmp,
})
)
weak_alias (memcmp, bcmp);
+strong_alias (memcmp, __memcmpeq)
#endif
@@ -137,4 +137,6 @@ END(memcmp)
#undef bcmp
weak_alias (memcmp, bcmp)
+#undef __memcmpeq
+strong_alias (memcmp, __memcmpeq)
libc_hidden_builtin_def (memcmp)
@@ -2612,3 +2612,4 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
@@ -2709,6 +2709,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2373,3 +2373,4 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
@@ -491,6 +491,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
@@ -488,6 +488,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
@@ -2647,3 +2647,4 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
@@ -2596,6 +2596,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2780,6 +2780,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2547,6 +2547,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -492,6 +492,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 _Exit F
GLIBC_2.4 _IO_2_1_stderr_ D 0x98
GLIBC_2.4 _IO_2_1_stdin_ D 0x98
@@ -2723,6 +2723,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2696,3 +2696,4 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
@@ -2693,3 +2693,4 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
@@ -2688,6 +2688,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2686,6 +2686,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2694,6 +2694,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2598,6 +2598,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2735,3 +2735,4 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
@@ -2750,6 +2750,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2783,6 +2783,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2506,6 +2506,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2808,3 +2808,4 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
@@ -2375,3 +2375,4 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
@@ -2575,3 +2575,4 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
@@ -2748,6 +2748,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2543,6 +2543,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2603,6 +2603,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2600,6 +2600,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2743,6 +2743,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 _IO_fprintf F
GLIBC_2.4 _IO_printf F
GLIBC_2.4 _IO_sprintf F
@@ -2570,6 +2570,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2521,6 +2521,7 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
GLIBC_2.4 __confstr_chk F
GLIBC_2.4 __fgets_chk F
GLIBC_2.4 __fgets_unlocked_chk F
@@ -2627,3 +2627,4 @@ GLIBC_2.34 tss_create F
GLIBC_2.34 tss_delete F
GLIBC_2.34 tss_get F
GLIBC_2.34 tss_set F
+GLIBC_2.35 __memcmpeq F
@@ -358,4 +358,7 @@ END(memcmp)
#undef bcmp
weak_alias (memcmp, bcmp)
+/* Weak alias for __memcmpeq here as it will be preempted by
+ definition coming from IFUNC in multiarch/memcmp.c. */
+weak_alias (memcmp, __memcmpeq)
libc_hidden_builtin_def (memcmp)
@@ -29,6 +29,8 @@
libc_ifunc_redirected (__redirect_memcmp, memcmp, IFUNC_SELECTOR ());
# undef bcmp
weak_alias (memcmp, bcmp)
+# undef __memcmpeq
+strong_alias (memcmp, __memcmpeq)
# ifdef SHARED
__hidden_ver1 (memcmp, __GI_memcmp, __redirect_memcmp)