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math: Remove the SVID error handling from log10f 

It improves latency for about 3-10% and throughput for about 5-10%.

Tested on x86_64-linux-gnu and i686-linux-gnu.

Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>
This commit is contained in:
Adhemerval Zanella 2025-10-08 10:55:08 -03:00
parent 6deadd4eb6
commit 0b484d7b77
29 changed files with 54 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
math/Versions
View File

@ -686,4 +686,8 @@ libm {
rootnf64x; rootnf128;
rsqrtf64x; rsqrtf128;
}
GLIBC_2.43 {
# No SVID compatible error handling.
log10f;
}
}

10
math/w_log10f_compat.c
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@ -22,10 +22,10 @@
#include <libm-alias-float.h>
#if LIBM_SVID_COMPAT
#if LIBM_SVID_COMPAT && SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_43)
/* wrapper log10f(x) */
float
__log10f (float x)
__log10_compatf (float x)
{
if (__builtin_expect (islessequal (x, 0.0f), 0) && _LIB_VERSION != _IEEE_)
{
@ -43,5 +43,9 @@ __log10f (float x)
return __ieee754_log10f (x);
}
libm_alias_float (__log10, log10)
# ifdef NO_COMPAT_NEEDED
libm_alias_float (__log10_compat, log10)
# else
compat_symbol (libm, __log10_compatf, log10f, GLIBC_2_0);
# endif
#endif

11
sysdeps/ieee754/flt-32/e_log10f.c
View File

@ -27,6 +27,8 @@ SOFTWARE.
#include <math.h>
#include <stdint.h>
#include <libm-alias-finite.h>
#include <libm-alias-float.h>
#include <math-svid-compat.h>
#include "math_config.h"
static __attribute__ ((noinline)) float
@ -45,7 +47,7 @@ as_special (float x)
}
float
__ieee754_log10f (float x)
__log10f (float x)
{
static const double tr[] =
{
@ -158,4 +160,11 @@ __ieee754_log10f (float x)
}
return ub;
}
strong_alias (__log10f, __ieee754_log10f)
#if LIBM_SVID_COMPAT
versioned_symbol (libm, __log10f, log10f, GLIBC_2_43);
libm_alias_float_other (__log10, log10)
#else
libm_alias_float (__log10, log10)
#endif
libm_alias_finite (__ieee754_log10f, __log10f)

1
sysdeps/ieee754/flt-32/w_log10f.c Normal file
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@ -0,0 +1 @@
/* Not needed. */

8
sysdeps/m68k/m680x0/fpu/w_log10f_compat.c Normal file
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@ -0,0 +1,8 @@
/* m68k provides an optimized __ieee754_log10f. */
#ifdef SHARED
# define NO_COMPAT_NEEDED 1
# include <math/w_log10f_compat.c>
#else
# include <math-type-macros-float.h>
# include <w_log10_template.c>
#endif

1
sysdeps/mach/hurd/i386/libm.abilist
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@ -1319,3 +1319,4 @@ GLIBC_2.42 rsqrtf64x F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 fmod F
GLIBC_2.43 fmodf F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/aarch64/libm.abilist
View File

@ -1285,3 +1285,4 @@ GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtf64x F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/alpha/libm.abilist
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@ -1444,3 +1444,4 @@ GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtf64x F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/arm/be/libm.abilist
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@ -950,3 +950,4 @@ GLIBC_2.42 rsqrtf32 F
GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/arm/le/libm.abilist
View File

@ -950,3 +950,4 @@ GLIBC_2.42 rsqrtf32 F
GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/hppa/libm.abilist
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@ -950,3 +950,4 @@ GLIBC_2.42 rsqrtf32 F
GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/i386/libm.abilist
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@ -1326,3 +1326,4 @@ GLIBC_2.42 rsqrtf64x F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 fmod F
GLIBC_2.43 fmodf F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist
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@ -950,3 +950,4 @@ GLIBC_2.42 rsqrtf32 F
GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/microblaze/be/libm.abilist
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@ -950,3 +950,4 @@ GLIBC_2.42 rsqrtf32 F
GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/microblaze/le/libm.abilist
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@ -950,3 +950,4 @@ GLIBC_2.42 rsqrtf32 F
GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/mips/mips32/libm.abilist
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@ -950,3 +950,4 @@ GLIBC_2.42 rsqrtf32 F
GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/mips/mips64/libm.abilist
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@ -1285,3 +1285,4 @@ GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtf64x F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist
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@ -1097,3 +1097,4 @@ GLIBC_2.42 rsqrtf32 F
GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist
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@ -1096,3 +1096,4 @@ GLIBC_2.42 rsqrtf32 F
GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libm.abilist
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@ -1090,3 +1090,4 @@ GLIBC_2.42 rsqrtf32 F
GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libm.abilist
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@ -1474,3 +1474,4 @@ GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtf64x F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist
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@ -1388,3 +1388,4 @@ GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtf64x F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist
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@ -1388,3 +1388,4 @@ GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtf64x F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/sh/be/libm.abilist
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@ -950,3 +950,4 @@ GLIBC_2.42 rsqrtf32 F
GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/sh/le/libm.abilist
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@ -950,3 +950,4 @@ GLIBC_2.42 rsqrtf32 F
GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist
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@ -1395,3 +1395,4 @@ GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtf64x F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist
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@ -1285,3 +1285,4 @@ GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtf64x F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/x86_64/64/libm.abilist
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@ -1318,3 +1318,4 @@ GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtf64x F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F

1
sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist
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@ -1318,3 +1318,4 @@ GLIBC_2.42 rsqrtf32x F
GLIBC_2.42 rsqrtf64 F
GLIBC_2.42 rsqrtf64x F
GLIBC_2.42 rsqrtl F
GLIBC_2.43 log10f F