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x86-64: Add log2f with FMA 

For workload-spec2017.wrf, on Skylake, it improves performance by:

                           Before            After     Improvement
reciprocal-throughput      16.5937          14.0789       17%
latency                    41.7755          35.3586       18%

	* sysdeps/x86_64/fpu/multiarch/Makefile (libm-sysdep_routines):
	Add e_log2f-fma.
	(CFLAGS-e_log2f-fma.c): New.
	* sysdeps/x86_64/fpu/multiarch/e_log2f-fma.c: New file.
	* sysdeps/x86_64/fpu/multiarch/e_log2f.c: Likewise.
This commit is contained in:
H.J. Lu 2017-10-22 08:06:46 -07:00
parent 0ccc7153cc
commit 5c7adbd8ed
4 changed files with 53 additions and 1 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2017-10-22 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/x86_64/fpu/multiarch/Makefile (libm-sysdep_routines):
Add e_log2f-fma.
(CFLAGS-e_log2f-fma.c): New.
* sysdeps/x86_64/fpu/multiarch/e_log2f-fma.c: New file.
* sysdeps/x86_64/fpu/multiarch/e_log2f.c: Likewise.
2017-10-22 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/x86_64/fpu/multiarch/Makefile (libm-sysdep_routines):

3
sysdeps/x86_64/fpu/multiarch/Makefile
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@ -37,10 +37,11 @@ CFLAGS-slowpow-fma.c = -mfma -mavx2
CFLAGS-s_sin-fma.c = -mfma -mavx2
CFLAGS-s_tan-fma.c = -mfma -mavx2
libm-sysdep_routines += e_exp2f-fma e_expf-fma e_logf-fma
libm-sysdep_routines += e_exp2f-fma e_expf-fma e_log2f-fma e_logf-fma
CFLAGS-e_exp2f-fma.c = -mfma -mavx2
CFLAGS-e_expf-fma.c = -mfma -mavx2
CFLAGS-e_log2f-fma.c = -mfma -mavx2
CFLAGS-e_logf-fma.c = -mfma -mavx2
libm-sysdep_routines += e_exp-fma4 e_log-fma4 e_pow-fma4 s_atan-fma4 \

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sysdeps/x86_64/fpu/multiarch/e_log2f-fma.c Normal file
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@ -0,0 +1,3 @@
#define __log2f __log2f_fma
#include <sysdeps/ieee754/flt-32/e_log2f.c>

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sysdeps/x86_64/fpu/multiarch/e_log2f.c Normal file
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/* Multiple versions of log2f.
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/>. */
extern float __redirect_log2f (float);
#define SYMBOL_NAME log2f
#include "ifunc-fma.h"
libc_ifunc_redirected (__redirect_log2f, __log2f, IFUNC_SELECTOR ());
#ifdef SHARED
__hidden_ver1 (__log2f, __GI___log2f, __redirect_log2f)
__attribute__ ((visibility ("hidden")));
# include <shlib-compat.h>
versioned_symbol (libm, __log2f, log2f, GLIBC_2_27);
#else
weak_alias (__log2f, log2f)
#endif
strong_alias (__log2f, __ieee754_log2f)
strong_alias (__log2f, __log2f_finite)
#define __log2f __log2f_sse2
#include <sysdeps/ieee754/flt-32/e_log2f.c>