diff mbox series

[v3] String: Add support for __memcmpeq() ABI on all targets

Message ID 20210928012407.557866-1-goldstein.w.n@gmail.com
State Superseded
Headers
Series [v3] String: Add support for __memcmpeq() ABI on all targets |

Checks

Context Check Description
dj/TryBot-apply_patch success Patch applied to master at the time it was sent
dj/TryBot-32bit success Build for i686

Commit Message

Noah Goldstein Sept. 28, 2021, 1:24 a.m. UTC 
  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.
---
 string/Versions                                  |  3 +++
 string/memcmp.c                                  |  2 ++
 string/string.h                                  | 13 +++++++++++++
 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                          |  2 ++
 sysdeps/x86_64/multiarch/memcmp.c                |  2 ++
 55 files changed, 91 insertions(+)

Comments

Andreas Schwab Sept. 28, 2021, 8:15 a.m. UTC | #1 
On Sep 27 2021, Noah Goldstein via Libc-alpha wrote:

> diff --git a/string/tester.c b/string/tester.c
> index 778160ae6e..7d8e1b7c1e 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. */

Style: space before paren.

Andreas.
Florian Weimer Sept. 28, 2021, 8:40 a.m. UTC | #2 
* Noah Goldstein via Libc-alpha:

> diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> index f6965c9d95..0fde110731 100644
> --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> @@ -2755,3 +2755,4 @@ GLIBC_2.9 ns_name_skip F
>  GLIBC_2.9 ns_name_uncompress F
>  GLIBC_2.9 ns_name_unpack F
>  GLIBC_2.9 pipe2 F
> +GLIBC_2.35 __memcmpeq F
> diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
> index 2e7603d9ed..73507b3a1e 100644
> --- a/sysdeps/unix/sysv/linux/i386/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
> @@ -2939,3 +2939,4 @@ GLIBC_2.9 ns_name_skip F
>  GLIBC_2.9 ns_name_uncompress F
>  GLIBC_2.9 ns_name_unpack F
>  GLIBC_2.9 pipe2 F
> +GLIBC_2.35 __memcmpeq F

These files still aren't sorted correctly.

Thanks,
Florian
Noah Goldstein Sept. 28, 2021, 4:47 p.m. UTC | #3 
On Tue, Sep 28, 2021 at 3:40 AM Florian Weimer <fweimer@redhat.com> wrote:
>
> * Noah Goldstein via Libc-alpha:
>
> > diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> > index f6965c9d95..0fde110731 100644
> > --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> > @@ -2755,3 +2755,4 @@ GLIBC_2.9 ns_name_skip F
> >  GLIBC_2.9 ns_name_uncompress F
> >  GLIBC_2.9 ns_name_unpack F
> >  GLIBC_2.9 pipe2 F
> > +GLIBC_2.35 __memcmpeq F
> > diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
> > index 2e7603d9ed..73507b3a1e 100644
> > --- a/sysdeps/unix/sysv/linux/i386/libc.abilist
> > +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
> > @@ -2939,3 +2939,4 @@ GLIBC_2.9 ns_name_skip F
> >  GLIBC_2.9 ns_name_uncompress F
> >  GLIBC_2.9 ns_name_unpack F
> >  GLIBC_2.9 pipe2 F
> > +GLIBC_2.35 __memcmpeq F
>
> These files still aren't sorted correctly.

Fixed. Think I got all of them.

Out of curiosity what dictates which files are sorted which ways?

>
> Thanks,
> Florian
>
Noah Goldstein Sept. 28, 2021, 4:47 p.m. UTC | #4 
On Tue, Sep 28, 2021 at 3:15 AM Andreas Schwab <schwab@linux-m68k.org> wrote:
>
> On Sep 27 2021, Noah Goldstein via Libc-alpha wrote:
>
> > diff --git a/string/tester.c b/string/tester.c
> > index 778160ae6e..7d8e1b7c1e 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. */
>
> Style: space before paren.
Fixed.
>
> Andreas.
>
> --
> Andreas Schwab, schwab@linux-m68k.org
> GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
> "And now for something completely different."
Florian Weimer Sept. 28, 2021, 4:51 p.m. UTC | #5 
* Noah Goldstein:

> On Tue, Sep 28, 2021 at 3:40 AM Florian Weimer <fweimer@redhat.com> wrote:
>>
>> * Noah Goldstein via Libc-alpha:
>>
>> > diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
>> > index f6965c9d95..0fde110731 100644
>> > --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
>> > +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
>> > @@ -2755,3 +2755,4 @@ GLIBC_2.9 ns_name_skip F
>> >  GLIBC_2.9 ns_name_uncompress F
>> >  GLIBC_2.9 ns_name_unpack F
>> >  GLIBC_2.9 pipe2 F
>> > +GLIBC_2.35 __memcmpeq F
>> > diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
>> > index 2e7603d9ed..73507b3a1e 100644
>> > --- a/sysdeps/unix/sysv/linux/i386/libc.abilist
>> > +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
>> > @@ -2939,3 +2939,4 @@ GLIBC_2.9 ns_name_skip F
>> >  GLIBC_2.9 ns_name_uncompress F
>> >  GLIBC_2.9 ns_name_unpack F
>> >  GLIBC_2.9 pipe2 F
>> > +GLIBC_2.35 __memcmpeq F
>>
>> These files still aren't sorted correctly.
>
> Fixed. Think I got all of them.
>
> Out of curiosity what dictates which files are sorted which ways?

All abilist files are sorted according to “LC_ALL=C sort”.

Thanks,
Florian
diff mbox series

Patch

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..550b7bb69b 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
+weak_alias (memcmp, __memcmpeq)
 #endif
diff --git a/string/string.h b/string/string.h
index 04e1b7067d..d965ca0eeb 100644
--- a/string/string.h
+++ b/string/string.h
@@ -64,6 +64,19 @@  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 equals.
+   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.
+
+   Used by compilers when memcmp return is only used for its bolean
+   value.  */
+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..7d8e1b7c1e 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..bc932eff2a 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
+weak_alias (memcmp, __memcmpeq)
 libc_hidden_builtin_def (memcmp)
diff --git a/sysdeps/csky/abiv2/memcmp.S b/sysdeps/csky/abiv2/memcmp.S
index 1560387618..d61fca0f29 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)
+weak_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..0194f8deab 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
+weak_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..956fc8e601 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)
+weak_alias (memcmp, __memcmpeq)
 #endif
diff --git a/sysdeps/i386/memcmp.S b/sysdeps/i386/memcmp.S
index 1f212b0f6d..18e225f963 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
+weak_alias (memcmp, __memcmpeq)
 libc_hidden_builtin_def (memcmp)
diff --git a/sysdeps/ia64/memcmp.S b/sysdeps/ia64/memcmp.S
index 97539c23fd..4488e0eba4 100644
--- a/sysdeps/ia64/memcmp.S
+++ b/sysdeps/ia64/memcmp.S
@@ -160,4 +160,5 @@  ENTRY(memcmp)
 END(memcmp)
 
 weak_alias (memcmp, bcmp)
+weak_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..e8b1b6c9bd 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)
+weak_alias (memcmp, __memcmpeq)
diff --git a/sysdeps/powerpc/powerpc32/power4/memcmp.S b/sysdeps/powerpc/powerpc32/power4/memcmp.S
index 814d2f211d..e4dde875bb 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)
+weak_alias (memcmp, __memcmpeq)
diff --git a/sysdeps/powerpc/powerpc32/power7/memcmp.S b/sysdeps/powerpc/powerpc32/power7/memcmp.S
index 8a19953e2d..e60a62fc86 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)
+weak_alias (memcmp, __memcmpeq)
diff --git a/sysdeps/powerpc/powerpc64/le/power10/memcmp.S b/sysdeps/powerpc/powerpc64/le/power10/memcmp.S
index 52f244e7e7..c7fe8047ca 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)
+weak_alias (memcmp, __memcmpeq)
diff --git a/sysdeps/powerpc/powerpc64/power4/memcmp.S b/sysdeps/powerpc/powerpc64/power4/memcmp.S
index dc1be3a0d8..4ab4a90496 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)
+weak_alias (memcmp, __memcmpeq)
diff --git a/sysdeps/powerpc/powerpc64/power7/memcmp.S b/sysdeps/powerpc/powerpc64/power7/memcmp.S
index bc034a55bc..b541978b5f 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)
+weak_alias (memcmp, __memcmpeq)
diff --git a/sysdeps/powerpc/powerpc64/power8/memcmp.S b/sysdeps/powerpc/powerpc64/power8/memcmp.S
index b676b09a9b..d4f84a5b6f 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)
+weak_alias (memcmp, __memcmpeq)
diff --git a/sysdeps/s390/memcmp-z900.S b/sysdeps/s390/memcmp-z900.S
index 995d52e47d..0942d32814 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)
+weak_alias (memcmp, __memcmpeq)
 #endif
 
 #if defined SHARED && IS_IN (libc)
diff --git a/sysdeps/s390/memcmp.c b/sysdeps/s390/memcmp.c
index 0b4e9da717..475fc45d3a 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);
+weak_alias (memcmp, __memcmpeq)
 #endif
diff --git a/sysdeps/sparc/sparc64/memcmp.S b/sysdeps/sparc/sparc64/memcmp.S
index d8d9ff9b24..edcc19915a 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
+weak_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..eb86ac77a1 100644
--- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
@@ -3037,3 +3037,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq 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..accb893165 100644
--- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
@@ -2736,3 +2736,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq F
diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
index 02f80418cc..b699df0a10 100644
--- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
@@ -2733,3 +2733,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq F
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..0fde110731 100644
--- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
@@ -2755,3 +2755,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq F
diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
index 2e7603d9ed..73507b3a1e 100644
--- a/sysdeps/unix/sysv/linux/i386/libc.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
@@ -2939,3 +2939,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq F
diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
index dd3a56d3fe..003aa08281 100644
--- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
@@ -2706,3 +2706,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq F
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
index c1e0ea9c10..1d2546d8d9 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
@@ -2715,3 +2715,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq F
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
index 93161048ca..e505a9fe15 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
@@ -2882,3 +2882,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq 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..b7a832f430 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
@@ -2843,3 +2843,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq 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..153a128ab4 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
@@ -2841,3 +2841,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq 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..b33cae050f 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
@@ -2849,3 +2849,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq 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..7729535954 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
@@ -2753,3 +2753,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq 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..9978c18019 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
@@ -3080,3 +3080,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq 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..4b0945e30c 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
@@ -3125,3 +3125,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq 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..eba9c641e9 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
@@ -2836,3 +2836,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq 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..29eeba351d 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
@@ -3092,3 +3092,4 @@  GLIBC_2.9 pututline F
 GLIBC_2.9 pututxline F
 GLIBC_2.9 updwtmp F
 GLIBC_2.9 updwtmpx F
+GLIBC_2.35 __memcmpeq 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..ed24ea1e1a 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
@@ -2871,3 +2871,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq F
diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
index dc502f6833..fdaa24a946 100644
--- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
@@ -2762,3 +2762,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq F
diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
index cba1abb556..993590b09a 100644
--- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
@@ -2759,3 +2759,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
index d4a516fb47..bb54de8e30 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
@@ -3097,3 +3097,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
index 6268875ba3..b4cb71c497 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
@@ -2729,3 +2729,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq 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..ee99d62fb5 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
@@ -2680,3 +2680,4 @@  GLIBC_2.9 ns_name_skip F
 GLIBC_2.9 ns_name_uncompress F
 GLIBC_2.9 ns_name_unpack F
 GLIBC_2.9 pipe2 F
+GLIBC_2.35 __memcmpeq 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..f41ae48006 100644
--- a/sysdeps/x86_64/memcmp.S
+++ b/sysdeps/x86_64/memcmp.S
@@ -358,4 +358,6 @@  END(memcmp)
 
 #undef bcmp
 weak_alias (memcmp, bcmp)
+#undef __memcmpeq
+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..9cc4750bbc 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
+weak_alias (memcmp, __memcmpeq)
 
 # ifdef SHARED
 __hidden_ver1 (memcmp, __GI_memcmp, __redirect_memcmp)