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x86_64: Add exp2m1f with FMA
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>
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@ -189,4 +189,6 @@ __exp2m1f (float x)
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return (s - 1.0) + w * c0;
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}
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}
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#ifndef __exp2m1f
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libm_alias_float (__exp2m1, exp2m1)
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#endif
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@ -12,6 +12,7 @@ CFLAGS-s_sin-fma.c = -mfma -mavx2
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CFLAGS-s_tan-fma.c = -mfma -mavx2
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CFLAGS-s_sincos-fma.c = -mfma -mavx2
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CFLAGS-s_exp10m1f-fma.c = -mfma -mavx2
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CFLAGS-s_exp2m1f-fma.c = -mfma -mavx2
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CFLAGS-e_exp2f-fma.c = -mfma -mavx2
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CFLAGS-e_expf-fma.c = -mfma -mavx2
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@ -74,6 +75,7 @@ libm-sysdep_routines += \
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s_cosf-fma \
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s_cosf-sse2 \
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s_exp10m1f-fma \
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s_exp2m1f-fma \
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s_expm1-fma \
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s_floor-sse4_1 \
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s_floorf-sse4_1 \
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4
sysdeps/x86_64/fpu/multiarch/s_exp2m1f-fma.c
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4
sysdeps/x86_64/fpu/multiarch/s_exp2m1f-fma.c
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@ -0,0 +1,4 @@
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#define __exp2m1f __exp2m1f_fma
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#define SECTION __attribute__ ((section (".text.fma")))
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#include <sysdeps/ieee754/flt-32/s_exp2m1f.c>
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33
sysdeps/x86_64/fpu/multiarch/s_exp2m1f.c
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33
sysdeps/x86_64/fpu/multiarch/s_exp2m1f.c
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@ -0,0 +1,33 @@
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/* Multiple versions of exp2m1.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdeps/x86/isa-level.h>
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#if MINIMUM_X86_ISA_LEVEL < AVX2_X86_ISA_LEVEL
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# include <libm-alias-float.h>
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extern float __redirect_exp2m1f (float);
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# define SYMBOL_NAME exp2m1f
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# include "ifunc-fma.h"
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libc_ifunc_redirected (__redirect_exp2m1f, __exp2m1f, IFUNC_SELECTOR ());
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libm_alias_float (__exp2m1, exp2m1)
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# define __exp2m1f __exp2m1f_sse2
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#endif
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#include <sysdeps/ieee754/flt-32/s_exp2m1f.c>
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