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6089a3ee24
This patch replaces i386 assembly versions of e_log2f with generic
e_log2f.c. For workload-spec2017.wrf, on Nehalem, it improves
performance by:
Before After Improvement
reciprocal-throughput 92.3845 30.8752 199%
latency 112.855 54.8645 105%
On Skylake, it improves performance by:
Before After Improvement
reciprocal-throughput 98.7488 22.7507 334%
latency 118.01 51.6083 128%
On IvyBridge with --disable-multi-arch, it improves performance by:
Before After Improvement
reciprocal-throughput 106.635 28.8596 269%
latency 129.888 56.9187 128%
* sysdeps/i386/fpu/e_log2f.S: Removed.
* sysdeps/i386/fpu/e_log2f_data.c: Likewise.
* sysdeps/i386/fpu/w_log2f.c: Likewise.
* sysdeps/i386/fpu/libm-test-ulps: Updated for generic e_log2f.c.
* sysdeps/i386/i686/fpu/multiarch/libm-test-ulps: Likewise.
* sysdeps/i386/i686/fpu/multiarch/Makefile (libm-sysdep_routines):
Add e_log2f-sse2.
(CFLAGS-e_log2f-sse2.c): New.
* sysdeps/i386/i686/fpu/multiarch/e_log2f-sse2.c: New file.
* sysdeps/i386/i686/fpu/multiarch/e_log2f.c: Likewise.
41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/* Multiple versions of log2f.
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Copyright (C) 2017 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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<http://www.gnu.org/licenses/>. */
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extern float __redirect_log2f (float);
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#define SYMBOL_NAME log2f
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#include "ifunc-sse2.h"
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libc_ifunc_redirected (__redirect_log2f, __log2f, IFUNC_SELECTOR ());
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#ifdef SHARED
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__hidden_ver1 (__log2f_ia32, __GI___log2f, __redirect_log2f)
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__attribute__ ((visibility ("hidden")));
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# include <shlib-compat.h>
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versioned_symbol (libm, __log2f, log2f, GLIBC_2_27);
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#else
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weak_alias (__log2f, log2f)
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#endif
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strong_alias (__log2f, __ieee754_log2f)
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strong_alias (__log2f, __log2f_finite)
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#define __log2f __log2f_ia32
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#include <sysdeps/ieee754/flt-32/e_log2f.c>
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