From 5c7adbd8eded546eb6e17a82f5ab3b35def47f38 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Sun, 22 Oct 2017 08:06:46 -0700 Subject: 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. --- sysdeps/x86_64/fpu/multiarch/Makefile | 3 ++- sysdeps/x86_64/fpu/multiarch/e_log2f-fma.c | 3 +++ sysdeps/x86_64/fpu/multiarch/e_log2f.c | 40 ++++++++++++++++++++++++++++++ 3 files changed, 45 insertions(+), 1 deletion(-) create mode 100644 sysdeps/x86_64/fpu/multiarch/e_log2f-fma.c create mode 100644 sysdeps/x86_64/fpu/multiarch/e_log2f.c (limited to 'sysdeps/x86_64') 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 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 + . */ + +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 +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 -- cgit 1.4.1