e1f59bebd8
This patch replaces x86-64 assembly versions of e_expf with generic
e_expf.c. For workload-spec2017.wrf, on Nehalem, it improves
performance by:
Before After Improvement
reciprocal-throughput 36.039 20.7749 73%
latency 58.8096 40.8715 43%
On Skylake, it improves
Before After Improvement
reciprocal-throughput 18.4436 11.1693 65%
latency 47.5162 37.5411 26%
* sysdeps/x86_64/fpu/e_expf.S: Removed.
* sysdeps/x86_64/fpu/multiarch/e_expf-fma.S: Likewise.
* sysdeps/x86_64/fpu/w_expf.c: Likewise.
* sysdeps/x86_64/fpu/libm-test-ulps: Updated for generic
e_expf.c.
* sysdeps/x86_64/fpu/multiarch/Makefile (CFLAGS-e_expf-fma.c):
New.
* sysdeps/x86_64/fpu/multiarch/e_expf-fma.c: New file.
* sysdeps/x86_64/fpu/multiarch/e_expf.c (__redirect_ieee754_expf):
Renamed to ...
(__redirect_expf): This.
(SYMBOL_NAME): Changed to expf.
(__ieee754_expf): Renamed to ...
(__expf): This.
(__GI___expf): This.
(__ieee754_expf): Add strong_alias.
(__expf_finite): Likewise.
(__expf): New.
Include <sysdeps/ieee754/flt-32/e_expf.c>.
41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/* Multiple versions of expf.
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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_expf (float);
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#define SYMBOL_NAME expf
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#include "ifunc-fma.h"
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libc_ifunc_redirected (__redirect_expf, __expf, IFUNC_SELECTOR ());
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#ifdef SHARED
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__hidden_ver1 (__expf, __GI___expf, __redirect_expf)
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__attribute__ ((visibility ("hidden")));
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# include <shlib-compat.h>
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versioned_symbol (libm, __expf, expf, GLIBC_2_27);
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#else
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weak_alias (__expf, expf)
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#endif
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strong_alias (__expf, __ieee754_expf)
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strong_alias (__expf, __expf_finite)
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#define __expf __expf_sse2
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#include <sysdeps/ieee754/flt-32/e_expf.c>
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