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5d15c96975
For workload-spec2017.wrf, on Skylake, it improves performance by:
Before After Improvement
reciprocal-throughput 13.0291 11.2225 16%
latency 44.5154 37.5766 18%
* sysdeps/x86_64/fpu/multiarch/Makefile (libm-sysdep_routines):
Add e_exp2f-fma.
(CFLAGS-e_exp2f-fma.c): New.
* sysdeps/x86_64/fpu/multiarch/e_exp2f-fma.c: New file.
* sysdeps/x86_64/fpu/multiarch/e_exp2f.c: Likewise.
38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
/* Multiple versions of exp2f.
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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_exp2f (float);
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#define SYMBOL_NAME exp2f
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#include "ifunc-fma.h"
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libc_ifunc_redirected (__redirect_exp2f, __exp2f, IFUNC_SELECTOR ());
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#ifdef SHARED
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# include <shlib-compat.h>
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versioned_symbol (libm, __exp2f, exp2f, GLIBC_2_27);
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#else
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weak_alias (__exp2f, exp2f)
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#endif
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strong_alias (__exp2f, __ieee754_exp2f)
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strong_alias (__exp2f, __exp2f_finite)
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#define __exp2f __exp2f_sse2
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#include <sysdeps/ieee754/flt-32/e_exp2f.c>
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