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math: Remove the SVID error handling from remainder

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The optimized i386 version is faster than the generic one, and
gcc implements it through the builtin. This optimization enables
us to migrate the implementation to a C version.  The performance
on a Zen3 chip is similar to the SVID one.

The m68k provided an optimized version through __m81_u(remainderf)
(mathimpl.h), and gcc does not implement it through a builtin
(different than i386).

Performance improves a bit on x86_64 (Zen3, gcc 15.2.1):

reciprocal-throughput           input    master   NO-SVID  improvement
x86_64                     subnormals   18.8522   16.2506       13.80%
x86_64                         normal  421.8260  403.9270        4.24%
x86_64                 close-exponent   21.0579   18.7642       10.89%
i686                       subnormals   21.3443   21.4229       -0.37%
i686                           normal  525.8380   538.807       -2.47%
i686                   close-exponent   21.6589   21.7983       -0.64%

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
2025-10-31 13:08:51 -03:00
parent c4c6c79d70
commit 0e1a1178ee
33 changed files with 118 additions and 37 deletions
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1
sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist
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@@ -1404,6 +1404,7 @@ GLIBC_2.43 j0f F
GLIBC_2.43 j1f F
GLIBC_2.43 jnf F
GLIBC_2.43 log10f F
GLIBC_2.43 remainder F
GLIBC_2.43 remainderf F
GLIBC_2.43 y0f F
GLIBC_2.43 y1f F

1
sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist
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@@ -1294,6 +1294,7 @@ GLIBC_2.43 j0f F
GLIBC_2.43 j1f F
GLIBC_2.43 jnf F
GLIBC_2.43 log10f F
GLIBC_2.43 remainder F
GLIBC_2.43 remainderf F
GLIBC_2.43 y0f F
GLIBC_2.43 y1f F