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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-10-22 08:06:46 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-10-22 08:06:58 -0700 |
| commit | 5c7adbd8eded546eb6e17a82f5ab3b35def47f38 (patch) | |
| tree | 028268e2e0619f90ed85bd1444421ab7ceabb3ff /sysdeps/x86_64 | |
| parent | 0ccc7153ccd8fbecefb0793a65cd5a85cdb099fc (diff) | |
| download | glibc-5c7adbd8eded546eb6e17a82f5ab3b35def47f38.tar.gz glibc-5c7adbd8eded546eb6e17a82f5ab3b35def47f38.tar.xz glibc-5c7adbd8eded546eb6e17a82f5ab3b35def47f38.zip | |
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.
Diffstat (limited to 'sysdeps/x86_64')
| -rw-r--r-- | sysdeps/x86_64/fpu/multiarch/Makefile | 3 | ||||
| -rw-r--r-- | sysdeps/x86_64/fpu/multiarch/e_log2f-fma.c | 3 | ||||
| -rw-r--r-- | sysdeps/x86_64/fpu/multiarch/e_log2f.c | 40 |
3 files changed, 45 insertions, 1 deletions
diff --git a/sysdeps/x86_64/fpu/multiarch/Makefile b/sysdeps/x86_64/fpu/multiarch/Makefile index 97d886aa59..5338a6b41b 100644 --- a/sysdeps/x86_64/fpu/multiarch/Makefile +++ b/sysdeps/x86_64/fpu/multiarch/Makefile @@ -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 \ diff --git a/sysdeps/x86_64/fpu/multiarch/e_log2f-fma.c b/sysdeps/x86_64/fpu/multiarch/e_log2f-fma.c new file mode 100644 index 0000000000..8a76b836fb --- /dev/null +++ b/sysdeps/x86_64/fpu/multiarch/e_log2f-fma.c @@ -0,0 +1,3 @@ +#define __log2f __log2f_fma + +#include <sysdeps/ieee754/flt-32/e_log2f.c> diff --git a/sysdeps/x86_64/fpu/multiarch/e_log2f.c b/sysdeps/x86_64/fpu/multiarch/e_log2f.c new file mode 100644 index 0000000000..be12c4529e --- /dev/null +++ b/sysdeps/x86_64/fpu/multiarch/e_log2f.c @@ -0,0 +1,40 @@ +/* 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> |