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x86_64: Add exp2m1f with FMA

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The CORE-MATH exp2m1f implementation showed slight worse latency
when using x86_64 baseline ABI.  This patch adds a ifunc variant
with similar performance for x86_64-v3.

Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Adhemerval Zanella 2024-10-25 15:21:55 -03:00
parent c28f8d7f19
commit 6d477b8de8
4 changed files with 41 additions and 0 deletions
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2
sysdeps/ieee754/flt-32/s_exp2m1f.c
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@ -189,4 +189,6 @@ __exp2m1f (float x)
return (s - 1.0) + w * c0;
}
}
#ifndef __exp2m1f
libm_alias_float (__exp2m1, exp2m1)
#endif

2
sysdeps/x86_64/fpu/multiarch/Makefile
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@ -12,6 +12,7 @@ CFLAGS-s_sin-fma.c = -mfma -mavx2
CFLAGS-s_tan-fma.c = -mfma -mavx2
CFLAGS-s_sincos-fma.c = -mfma -mavx2
CFLAGS-s_exp10m1f-fma.c = -mfma -mavx2
CFLAGS-s_exp2m1f-fma.c = -mfma -mavx2
CFLAGS-e_exp2f-fma.c = -mfma -mavx2
CFLAGS-e_expf-fma.c = -mfma -mavx2
@ -74,6 +75,7 @@ libm-sysdep_routines += \
s_cosf-fma \
s_cosf-sse2 \
s_exp10m1f-fma \
s_exp2m1f-fma \
s_expm1-fma \
s_floor-sse4_1 \
s_floorf-sse4_1 \

4
sysdeps/x86_64/fpu/multiarch/s_exp2m1f-fma.c Normal file
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@ -0,0 +1,4 @@
#define __exp2m1f __exp2m1f_fma
#define SECTION __attribute__ ((section (".text.fma")))
#include <sysdeps/ieee754/flt-32/s_exp2m1f.c>

33
sysdeps/x86_64/fpu/multiarch/s_exp2m1f.c Normal file
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@ -0,0 +1,33 @@
/* Multiple versions of exp2m1.
Copyright (C) 2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sysdeps/x86/isa-level.h>
#if MINIMUM_X86_ISA_LEVEL < AVX2_X86_ISA_LEVEL
# include <libm-alias-float.h>
extern float __redirect_exp2m1f (float);
# define SYMBOL_NAME exp2m1f
# include "ifunc-fma.h"
libc_ifunc_redirected (__redirect_exp2m1f, __exp2m1f, IFUNC_SELECTOR ());
libm_alias_float (__exp2m1, exp2m1)
# define __exp2m1f __exp2m1f_sse2
#endif
#include <sysdeps/ieee754/flt-32/s_exp2m1f.c>