Patchwork [8/9] Remove the error handling wrapper from log2

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Submitter Szabolcs Nagy
Date June 29, 2018, 12:56 p.m.
Message ID <a1760a90-08f5-a684-cf16-14f67f1931d6@arm.com>
Download mbox | patch
Permalink /patch/28149/
State New
Headers show

Comments

Szabolcs Nagy - June 29, 2018, 12:56 p.m.
Introduce new log2 symbol version that doesn't do SVID compatible error
handling.  The standard errno and fp exception based error handling is
inline in the new code and does not have significant overhead (only
affects uncommon special case code paths).

The w_log2.c wrapper is disabled for sysdeps/ieee754/dbl-64 by using an
empty w_log2.c and enabled for targets that use their own log2
implementation.

The __log2_finite symbol is just an alias to log2 now.  For backward
compatibility the old log2 symbol versions still use a wrapper with
SVID error handling around the new code.

The ia64 asm is chaned so the compat and new symbol versions map to the
same address.

2018-06-29  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* math/Versions (GLIBC_2.28): Add log2.
	* math/w_log2_compat.c (__log2_compat): Change to versioned compat
	symbol.
	* math/w_log2.c: New file.
	* sysdeps/i386/fpu/w_log2.c: New file.
	* sysdeps/ia64/fpu/e_log2.S: Add versioned symbols.
	* sysdeps/ieee754/dbl-64/e_log2.c (__ieee754_log2): Rename to __log2
	and add necessary aliases.
	* sysdeps/ieee754/dbl-64/w_log2.c: New file.
	* sysdeps/m68k/m680x0/fpu/w_log2.c: New file.
	* sysdeps/mach/hurd/i386/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/alpha/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/arm/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/hppa/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/i386/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/ia64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/nios2/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/riscv/rv64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/sh/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Update.
---
  math/Versions                                                |  2 +-
  math/w_log2.c                                                |  8 ++++++++
  math/w_log2_compat.c                                         |  6 +++---
  sysdeps/i386/fpu/w_log2.c                                    |  1 +
  sysdeps/ia64/fpu/e_log2.S                                    |  6 ++++++
  sysdeps/ieee754/dbl-64/e_log2.c                              | 11 ++++++++---
  sysdeps/ieee754/dbl-64/w_log2.c                              |  1 +
  sysdeps/m68k/m680x0/fpu/w_log2.c                             |  1 +
  sysdeps/mach/hurd/i386/libm.abilist                          |  1 +
  sysdeps/unix/sysv/linux/aarch64/libm.abilist                 |  1 +
  sysdeps/unix/sysv/linux/alpha/libm.abilist                   |  1 +
  sysdeps/unix/sysv/linux/arm/libm.abilist                     |  1 +
  sysdeps/unix/sysv/linux/hppa/libm.abilist                    |  1 +
  sysdeps/unix/sysv/linux/i386/libm.abilist                    |  1 +
  sysdeps/unix/sysv/linux/ia64/libm.abilist                    |  1 +
  sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist           |  1 +
  sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist             |  1 +
  sysdeps/unix/sysv/linux/microblaze/libm.abilist              |  1 +
  sysdeps/unix/sysv/linux/mips/mips32/libm.abilist             |  1 +
  sysdeps/unix/sysv/linux/mips/mips64/libm.abilist             |  1 +
  sysdeps/unix/sysv/linux/nios2/libm.abilist                   |  1 +
  sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist   |  1 +
  sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist |  1 +
  sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist       |  1 +
  sysdeps/unix/sysv/linux/riscv/rv64/libm.abilist              |  1 +
  sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist            |  1 +
  sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist            |  1 +
  sysdeps/unix/sysv/linux/sh/libm.abilist                      |  1 +
  sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist           |  1 +
  sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist           |  1 +
  sysdeps/unix/sysv/linux/x86_64/64/libm.abilist               |  1 +
  sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist              |  1 +
  32 files changed, 53 insertions(+), 7 deletions(-)
  create mode 100644 math/w_log2.c
  create mode 100644 sysdeps/i386/fpu/w_log2.c
  create mode 100644 sysdeps/ieee754/dbl-64/w_log2.c
  create mode 100644 sysdeps/m68k/m680x0/fpu/w_log2.c

Patch

diff --git a/math/Versions b/math/Versions
index 78d02c2f41..986dd3cee4 100644
--- a/math/Versions
+++ b/math/Versions
@@ -575,6 +575,6 @@  libm {
     f32xsubf64x; f32xsubf128; f64subf64x; f64subf128;
     f64xsubf128;
     # No SVID compatible error handling.
-    exp; exp2; log;
+    exp; exp2; log; log2;
   }
 }
diff --git a/math/w_log2.c b/math/w_log2.c
new file mode 100644
index 0000000000..da00b2805f
--- /dev/null
+++ b/math/w_log2.c
@@ -0,0 +1,8 @@ 
+#include <math-type-macros-double.h>
+#undef __USE_WRAPPER_TEMPLATE
+#define __USE_WRAPPER_TEMPLATE 1
+#undef declare_mgen_alias
+#define declare_mgen_alias(a, b)
+#include <w_log2_template.c>
+versioned_symbol (libm, __log2, log2, GLIBC_2_28);
+libm_alias_double_other (__log2, log2)
diff --git a/math/w_log2_compat.c b/math/w_log2_compat.c
index 61e7170ae1..4bd5289606 100644
--- a/math/w_log2_compat.c
+++ b/math/w_log2_compat.c
@@ -23,10 +23,10 @@ 
 #include <libm-alias-double.h>
 
 
-#if LIBM_SVID_COMPAT
+#if LIBM_SVID_COMPAT && SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_28)
 /* wrapper log2(x) */
 double
-__log2 (double x)
+__log2_compat (double x)
 {
   if (__builtin_expect (islessequal (x, 0.0), 0) && _LIB_VERSION != _IEEE_)
     {
@@ -44,5 +44,5 @@  __log2 (double x)
 
   return  __ieee754_log2 (x);
 }
-libm_alias_double (__log2, log2)
+compat_symbol (libm, __log2_compat, log2, GLIBC_2_1);
 #endif
diff --git a/sysdeps/i386/fpu/w_log2.c b/sysdeps/i386/fpu/w_log2.c
new file mode 100644
index 0000000000..eafbe5cf3e
--- /dev/null
+++ b/sysdeps/i386/fpu/w_log2.c
@@ -0,0 +1 @@ 
+#include <sysdeps/../math/w_log2.c>
diff --git a/sysdeps/ia64/fpu/e_log2.S b/sysdeps/ia64/fpu/e_log2.S
index 17893a2ede..c0831b3701 100644
--- a/sysdeps/ia64/fpu/e_log2.S
+++ b/sysdeps/ia64/fpu/e_log2.S
@@ -655,6 +655,12 @@  SPECIAL_LOG2:
 
 GLOBAL_LIBM_END(log2)
 libm_alias_double_other (log2, log2)
+#ifdef SHARED
+.symver log2,log2@@GLIBC_2.28
+.weak __log2_compat
+.set __log2_compat,__log2
+.symver __log2_compat,log2@GLIBC_2.1
+#endif
 
 
 LOCAL_LIBM_ENTRY(__libm_error_region)
diff --git a/sysdeps/ieee754/dbl-64/e_log2.c b/sysdeps/ieee754/dbl-64/e_log2.c
index 9c63cb6beb..24f6715732 100644
--- a/sysdeps/ieee754/dbl-64/e_log2.c
+++ b/sysdeps/ieee754/dbl-64/e_log2.c
@@ -18,6 +18,8 @@ 
 
 #include <math.h>
 #include <stdint.h>
+#include <shlib-compat.h>
+#include <libm-alias-double.h>
 #include "math_config.h"
 
 #define T __log2_data.tab
@@ -37,7 +39,7 @@  top16 (double x)
 }
 
 double
-__ieee754_log2 (double x)
+__log2 (double x)
 {
   /* double_t for better performance on targets with FLT_EVAL_METHOD==2.  */
   double_t z, r, r2, r4, y, invc, logc, kd, hi, lo, t1, t2, t3, p;
@@ -142,6 +144,9 @@  __ieee754_log2 (double x)
 #endif
   return y;
 }
-#ifndef __ieee754_log2
-strong_alias (__ieee754_log2, __log2_finite)
+#ifndef __log2
+strong_alias (__log2, __ieee754_log2)
+strong_alias (__log2, __log2_finite)
+versioned_symbol (libm, __log2, log2, GLIBC_2_28);
+libm_alias_double_other (__log2, log2)
 #endif
diff --git a/sysdeps/ieee754/dbl-64/w_log2.c b/sysdeps/ieee754/dbl-64/w_log2.c
new file mode 100644
index 0000000000..1cc8931700
--- /dev/null
+++ b/sysdeps/ieee754/dbl-64/w_log2.c
@@ -0,0 +1 @@ 
+/* Not needed.  */
diff --git a/sysdeps/m68k/m680x0/fpu/w_log2.c b/sysdeps/m68k/m680x0/fpu/w_log2.c
new file mode 100644
index 0000000000..eafbe5cf3e
--- /dev/null
+++ b/sysdeps/m68k/m680x0/fpu/w_log2.c
@@ -0,0 +1 @@ 
+#include <sysdeps/../math/w_log2.c>
diff --git a/sysdeps/mach/hurd/i386/libm.abilist b/sysdeps/mach/hurd/i386/libm.abilist
index e4df9ed69d..49b8298cae 100644
--- a/sysdeps/mach/hurd/i386/libm.abilist
+++ b/sysdeps/mach/hurd/i386/libm.abilist
@@ -1071,3 +1071,4 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
diff --git a/sysdeps/unix/sysv/linux/aarch64/libm.abilist b/sysdeps/unix/sysv/linux/aarch64/libm.abilist
index 1c3add0005..5822c73a25 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libm.abilist
@@ -1035,3 +1035,4 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
diff --git a/sysdeps/unix/sysv/linux/alpha/libm.abilist b/sysdeps/unix/sysv/linux/alpha/libm.abilist
index 3f322996a5..99fd72df34 100644
--- a/sysdeps/unix/sysv/linux/alpha/libm.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libm.abilist
@@ -1046,6 +1046,7 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
 GLIBC_2.3.4 __c1_cabsf F
 GLIBC_2.3.4 __c1_cacosf F
 GLIBC_2.3.4 __c1_cacoshf F
diff --git a/sysdeps/unix/sysv/linux/arm/libm.abilist b/sysdeps/unix/sysv/linux/arm/libm.abilist
index 709a2f6b75..f25337fe76 100644
--- a/sysdeps/unix/sysv/linux/arm/libm.abilist
+++ b/sysdeps/unix/sysv/linux/arm/libm.abilist
@@ -456,6 +456,7 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
 GLIBC_2.4 _LIB_VERSION D 0x4
 GLIBC_2.4 __clog10 F
 GLIBC_2.4 __clog10f F
diff --git a/sysdeps/unix/sysv/linux/hppa/libm.abilist b/sysdeps/unix/sysv/linux/hppa/libm.abilist
index 843b35ff24..cee07ba66c 100644
--- a/sysdeps/unix/sysv/linux/hppa/libm.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libm.abilist
@@ -767,4 +767,5 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
 GLIBC_2.4 exp2l F
diff --git a/sysdeps/unix/sysv/linux/i386/libm.abilist b/sysdeps/unix/sysv/linux/i386/libm.abilist
index e813a34b69..98f19cb137 100644
--- a/sysdeps/unix/sysv/linux/i386/libm.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libm.abilist
@@ -1078,3 +1078,4 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
diff --git a/sysdeps/unix/sysv/linux/ia64/libm.abilist b/sysdeps/unix/sysv/linux/ia64/libm.abilist
index b71bb9b08f..b32cff741b 100644
--- a/sysdeps/unix/sysv/linux/ia64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/ia64/libm.abilist
@@ -1008,3 +1008,4 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist
index 709a2f6b75..f25337fe76 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist
@@ -456,6 +456,7 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
 GLIBC_2.4 _LIB_VERSION D 0x4
 GLIBC_2.4 __clog10 F
 GLIBC_2.4 __clog10f F
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist
index 591b67823c..9a04d77ec0 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist
@@ -807,3 +807,4 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
diff --git a/sysdeps/unix/sysv/linux/microblaze/libm.abilist b/sysdeps/unix/sysv/linux/microblaze/libm.abilist
index ada5cb622e..519eaa6df9 100644
--- a/sysdeps/unix/sysv/linux/microblaze/libm.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/libm.abilist
@@ -768,3 +768,4 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/libm.abilist b/sysdeps/unix/sysv/linux/mips/mips32/libm.abilist
index 085b26ade4..4050a919d5 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/libm.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/libm.abilist
@@ -767,4 +767,5 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
 GLIBC_2.4 exp2l F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/libm.abilist b/sysdeps/unix/sysv/linux/mips/mips64/libm.abilist
index e3857aa5e5..61c60c4e11 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/libm.abilist
@@ -1035,3 +1035,4 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
diff --git a/sysdeps/unix/sysv/linux/nios2/libm.abilist b/sysdeps/unix/sysv/linux/nios2/libm.abilist
index 72da89b941..bc52c8f7ee 100644
--- a/sysdeps/unix/sysv/linux/nios2/libm.abilist
+++ b/sysdeps/unix/sysv/linux/nios2/libm.abilist
@@ -768,3 +768,4 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist
index 3191dd05ab..66f87147e2 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist
@@ -813,6 +813,7 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
 GLIBC_2.4 __clog10l F
 GLIBC_2.4 __finitel F
 GLIBC_2.4 __fpclassifyl F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist
index 74f61203af..324b4e68dc 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist
@@ -812,6 +812,7 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
 GLIBC_2.4 __clog10l F
 GLIBC_2.4 __finitel F
 GLIBC_2.4 __fpclassifyl F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist
index a57ea562e1..39ff08b018 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist
@@ -491,6 +491,7 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
 GLIBC_2.3 _LIB_VERSION D 0x4
 GLIBC_2.3 __clog10 F
 GLIBC_2.3 __clog10f F
diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libm.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libm.abilist
index 83a78fc91a..1c8404c8de 100644
--- a/sysdeps/unix/sysv/linux/riscv/rv64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/riscv/rv64/libm.abilist
@@ -1022,3 +1022,4 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist
index 53dbbe1a45..ba4d1a1959 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist
@@ -1036,6 +1036,7 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
 GLIBC_2.4 __clog10l F
 GLIBC_2.4 __finitel F
 GLIBC_2.4 __fpclassifyl F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist
index 446c18bbd8..3649e5321a 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist
@@ -1036,6 +1036,7 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
 GLIBC_2.4 __clog10l F
 GLIBC_2.4 __finitel F
 GLIBC_2.4 __fpclassifyl F
diff --git a/sysdeps/unix/sysv/linux/sh/libm.abilist b/sysdeps/unix/sysv/linux/sh/libm.abilist
index cc7289f1fe..5e42e06e1d 100644
--- a/sysdeps/unix/sysv/linux/sh/libm.abilist
+++ b/sysdeps/unix/sysv/linux/sh/libm.abilist
@@ -767,4 +767,5 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
 GLIBC_2.4 exp2l F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist
index 0dfc34b305..795f7a70de 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist
@@ -1043,6 +1043,7 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
 GLIBC_2.4 __clog10l F
 GLIBC_2.4 __finitel F
 GLIBC_2.4 __fpclassifyl F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist
index f17165c5bd..e3cd41f16e 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist
@@ -1035,3 +1035,4 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libm.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libm.abilist
index d76f2b221d..6d9a61107c 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libm.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libm.abilist
@@ -1069,3 +1069,4 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist
index fbf49ae82d..ca609340df 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist
@@ -1069,3 +1069,4 @@  GLIBC_2.28 fmull F
 GLIBC_2.28 fsub F
 GLIBC_2.28 fsubl F
 GLIBC_2.28 log F
+GLIBC_2.28 log2 F