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x86-64: Add cosf with FMA 

On Skylake, bench-cosf reports performance improvement:

            Before        After         Improvement
max        135.362       94.552            43%
min        8.532         7.688             11%
mean       17.1446       11.8128           45%

	* sysdeps/x86_64/fpu/multiarch/Makefile (libm-sysdep_routines):
	Add s_cosf-sse2 and s_cosf-fma.
	(CFLAGS-s_cosf-fma.c): New.
	* sysdeps/x86_64/fpu/multiarch/s_cosf-fma.c: New file.
	* sysdeps/x86_64/fpu/multiarch/s_cosf-sse2.c: Likewise.
	* sysdeps/x86_64/fpu/multiarch/s_cosf.c: Likewise.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
H.J. Lu 2017-12-12 15:32:58 -08:00
parent eb4285768b
commit ac817e083b
6 changed files with 47 additions and 4 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2017-12-12 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/x86_64/fpu/multiarch/Makefile (libm-sysdep_routines):
Add s_cosf-sse2 and s_cosf-fma.
(CFLAGS-s_cosf-fma.c): New.
* sysdeps/x86_64/fpu/multiarch/s_cosf-fma.c: New file.
* sysdeps/x86_64/fpu/multiarch/s_cosf-sse2.c: Likewise.
* sysdeps/x86_64/fpu/multiarch/s_cosf.c: Likewise.
2017-12-12 Steve Ellcey <sellcey@cavium.com>
* nscd/nscd.h (init_traced_file): Change strncpy to memcpy.

5
NEWS
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@ -9,8 +9,9 @@ Version 2.27
Major new features:
* Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, sinf and
tan with FMA, contributed by Arjan van de Ven and H.J. Lu from Intel.
* Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
sinf and tan with FMA, contributed by Arjan van de Ven and H.J. Lu
from Intel.
* Optimized x86-64 trunc and truncf for processors with SSE4.1.

5
sysdeps/x86_64/fpu/multiarch/Makefile
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@ -37,10 +37,10 @@ CFLAGS-slowpow-fma.c = -mfma -mavx2
CFLAGS-s_sin-fma.c = -mfma -mavx2
CFLAGS-s_tan-fma.c = -mfma -mavx2
libm-sysdep_routines += s_sinf-sse2
libm-sysdep_routines += s_sinf-sse2 s_cosf-sse2
libm-sysdep_routines += e_exp2f-fma e_expf-fma e_log2f-fma e_logf-fma \
e_powf-fma s_sinf-fma
e_powf-fma s_sinf-fma s_cosf-fma
CFLAGS-e_exp2f-fma.c = -mfma -mavx2
CFLAGS-e_expf-fma.c = -mfma -mavx2
@ -48,6 +48,7 @@ CFLAGS-e_log2f-fma.c = -mfma -mavx2
CFLAGS-e_logf-fma.c = -mfma -mavx2
CFLAGS-e_powf-fma.c = -mfma -mavx2
CFLAGS-s_sinf-fma.c = -mfma -mavx2
CFLAGS-s_cosf-fma.c = -mfma -mavx2
libm-sysdep_routines += e_exp-fma4 e_log-fma4 e_pow-fma4 s_atan-fma4 \
e_asin-fma4 e_atan2-fma4 s_sin-fma4 s_tan-fma4 \

2
sysdeps/x86_64/fpu/multiarch/s_cosf-fma.c Normal file
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@ -0,0 +1,2 @@
#define COSF __cosf_fma
#include <sysdeps/ieee754/flt-32/s_cosf.c>

2
sysdeps/x86_64/fpu/multiarch/s_cosf-sse2.c Normal file
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@ -0,0 +1,2 @@
#define COSF __cosf_sse2
#include <sysdeps/ieee754/flt-32/s_cosf.c>

28
sysdeps/x86_64/fpu/multiarch/s_cosf.c Normal file
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@ -0,0 +1,28 @@
/* Multiple versions of cosf.
Copyright (C) 2017 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
<http://www.gnu.org/licenses/>. */
#include <libm-alias-float.h>
extern float __redirect_cosf (float);
#define SYMBOL_NAME cosf
#include "ifunc-fma.h"
libc_ifunc_redirected (__redirect_cosf, __cosf, IFUNC_SELECTOR ());
libm_alias_float (__cos, cos)