mirror of
https://sourceware.org/git/glibc.git
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powerpc: Use generic e_expf
Generic implementation is faster on both power8 and power9:
POWER9:
- sysdeps/ieee754/flt-32/e_expf.c
"expf": {
"workload-spec2017.wrf": {
"duration": 5.1236e+09,
"iterations": 7.53344e+08,
"reciprocal-throughput": 5.9436,
"latency": 7.65869,
"max-throughput": 1.68248e+08,
"min-throughput": 1.30571e+08
}
}
- sysdeps/powerpc/powerpc64/power8/fpu/e_expf.S
"expf": {
"workload-spec2017.wrf": {
"duration": 5.14429e+09,
"iterations": 5.29248e+08,
"reciprocal-throughput": 8.05372,
"latency": 11.3863,
"max-throughput": 1.24166e+08,
"min-throughput": 8.78249e+07
}
}
Checked on powerpc-linux-gnu (built without --with-cpu, with
--with-cpu=power4 and with --with-cpu=power5+ and --disable-multi-arch),
powerpc64-linux-gnu (built without --with-cp and with --with-cpu=power5+
and --disable-multi-arch).
* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
(libm-sysdep_routines): Remove e_expf-power8 and expf-ppc64.
* sysdeps/powerpc/powerpc64/fpu/multiarch/e_expf-power8.S: Remove
file.
* sysdeps/powerpc/powerpc64/fpu/multiarch/e_expf-ppc64.c: Likewise.
* sysdeps/powerpc/powerpc64/fpu/multiarch/e_expf.c: Likewise.
* sysdeps/powerpc/powerpc64/fpu/multiarch/w_expf.c: Likewise.
* sysdeps/powerpc/powerpc64/power8/fpu/e_expf.S: Likewise.
* sysdeps/powerpc/powerpc64/power8/fpu/w_expf.c: Likewise.
Reviewed-by: Gabriel F. T. Gomes <gabriel@inconstante.eti.br>
This commit is contained in:
Adhemerval Zanella
parent
9d5d214e86
commit
aa32f5bf0c
10
ChangeLog
10
ChangeLog
@ -1,5 +1,15 @@
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2019-06-26 Adhemerval Zanella <adhemerval.zanella@linaro.org>
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* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
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(libm-sysdep_routines): Remove e_expf-power8 and expf-ppc64.
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* sysdeps/powerpc/powerpc64/fpu/multiarch/e_expf-power8.S: Remove
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file.
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* sysdeps/powerpc/powerpc64/fpu/multiarch/e_expf-ppc64.c: Likewise.
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* sysdeps/powerpc/powerpc64/fpu/multiarch/e_expf.c: Likewise.
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* sysdeps/powerpc/powerpc64/fpu/multiarch/w_expf.c: Likewise.
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* sysdeps/powerpc/powerpc64/power8/fpu/e_expf.S: Likewise.
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* sysdeps/powerpc/powerpc64/power8/fpu/w_expf.c: Likewise.
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* sysdeps/powerpc/powerpc32/fpu/Makefile
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[$(subdir) == math] (CFLAGS-s_lround.c): New rule.
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* sysdeps/powerpc/powerpc32/fpu/s_llround.c (__llround): Add power5+
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@ -10,7 +10,6 @@ libm-sysdep_routines += s_logb-power7 s_logbf-power7 \
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s_logbl-power7 s_logb-ppc64 s_logbf-ppc64 \
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s_logbl-ppc64 e_hypot-ppc64 \
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e_hypot-power7 e_hypotf-ppc64 e_hypotf-power7 \
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e_expf-power8 e_expf-ppc64 \
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$(sysdep_calls:s_%=m_%)
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CFLAGS-s_logbf-power7.c = -mcpu=power7
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@ -1,24 +0,0 @@
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/* __ieee754_expf() POWER8 version.
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Copyright (C) 2016-2019 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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#undef strong_alias
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#define strong_alias(a, b)
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#define __ieee754_expf __ieee754_expf_power8
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#include <sysdeps/powerpc/powerpc64/power8/fpu/e_expf.S>
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@ -1,21 +0,0 @@
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/* __ieee_expf() PowerPC64 version.
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Copyright (C) 2016-2019 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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#define __expf __ieee754_expf_ppc64
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#include <sysdeps/ieee754/flt-32/e_expf.c>
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@ -1,32 +0,0 @@
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/* Multiple versions of ieee754_expf.
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Copyright (C) 2016-2019 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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#include <math.h>
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#include <math_private.h>
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#include <math_ldbl_opt.h>
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#include "init-arch.h"
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extern __typeof (__ieee754_expf) __ieee754_expf_ppc64 attribute_hidden;
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extern __typeof (__ieee754_expf) __ieee754_expf_power8 attribute_hidden;
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libc_ifunc (__ieee754_expf,
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(hwcap2 & PPC_FEATURE2_ARCH_2_07)
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? __ieee754_expf_power8
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: __ieee754_expf_ppc64);
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strong_alias (__ieee754_expf, __expf_finite)
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@ -1 +0,0 @@
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#include <sysdeps/../math/w_expf.c>
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@ -1,303 +0,0 @@
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/* Optimized expf(). PowerPC64/POWER8 version.
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Copyright (C) 2016-2019 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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#include <sysdep.h>
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/* Short algorithm description:
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*
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* Let K = 64 (table size).
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* e^x = 2^(x/log(2)) = 2^n * T[j] * (1 + P(y))
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* where:
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* x = m*log(2)/K + y, y in [0.0..log(2)/K]
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* m = n*K + j, m,n,j - signed integer, j in [0..K-1]
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* values of 2^(j/K) are tabulated as T[j].
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*
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* P(y) is a minimax polynomial approximation of expf(y)-1
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* on small interval [0.0..log(2)/K].
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*
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* P(y) = P3*y*y*y*y + P2*y*y*y + P1*y*y + P0*y, calculated as
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* z = y*y; P(y) = (P3*z + P1)*z + (P2*z + P0)*y
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*
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* Special cases:
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* expf(NaN) = NaN
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* expf(+INF) = +INF
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* expf(-INF) = 0
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* expf(x) = 1 for subnormals
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* for finite argument, only expf(0)=1 is exact
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* expf(x) overflows if x>88.7228317260742190
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* expf(x) underflows if x<-103.972076416015620
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*/
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#define C1 0x42ad496b /* Single precision 125*log(2). */
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#define C2 0x31800000 /* Single precision 2^(-28). */
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#define SP_INF 0x7f800000 /* Single precision Inf. */
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#define SP_EXP_BIAS 0x1fc0 /* Single precision exponent bias. */
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#define DATA_OFFSET r9
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/* Implements the function
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float [fp1] expf (float [fp1] x) */
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.machine power8
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ENTRY (__ieee754_expf, 4)
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addis DATA_OFFSET,r2,.Lanchor@toc@ha
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addi DATA_OFFSET,DATA_OFFSET,.Lanchor@toc@l
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xscvdpspn v0,v1
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mfvsrd r8,v0 /* r8 = x */
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lfd fp2,(.KLN2-.Lanchor)(DATA_OFFSET)
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lfd fp3,(.P2-.Lanchor)(DATA_OFFSET)
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rldicl r3,r8,32,33 /* r3 = |x| */
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lis r4,C1@ha /* r4 = 125*log(2) */
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ori r4,r4,C1@l
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cmpw r3,r4
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lfd fp5,(.P3-.Lanchor)(DATA_OFFSET)
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lfd fp4,(.RS-.Lanchor)(DATA_OFFSET)
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fmadd fp2,fp1,fp2,fp4 /* fp2 = x * K/log(2) + (2^23 + 2^22) */
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bge L(special_paths) /* |x| >= 125*log(2) ? */
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lis r4,C2@ha
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ori r4,r4,C2@l
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cmpw r3,r4
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blt L(small_args) /* |x| < 2^(-28) ? */
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/* Main path: here if 2^(-28) <= |x| < 125*log(2) */
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frsp fp6,fp2
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xscvdpsp v2,v2
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mfvsrd r8,v2
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mr r3,r8 /* r3 = m */
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rldicl r8,r8,32,58 /* r8 = j */
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lfs fp4,(.SP_RS-.Lanchor)(DATA_OFFSET)
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fsubs fp2,fp6,fp4 /* fp2 = m = x * K/log(2) */
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srdi r3,r3,32
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clrrwi r3,r3,6 /* r3 = n */
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lfd fp6,(.NLN2K-.Lanchor)(DATA_OFFSET)
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fmadd fp0,fp2,fp6,fp1 /* fp0 = y = x - m*log(2)/K */
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fmul fp2,fp0,fp0 /* fp2 = z = y^2 */
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lfd fp4,(.P1-.Lanchor)(DATA_OFFSET)
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lfd fp6,(.P0-.Lanchor)(DATA_OFFSET)
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lis r4,SP_EXP_BIAS@ha
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ori r4,r4,SP_EXP_BIAS@l
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add r3,r3,r4
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rldic r3,r3,49,1 /* r3 = 2^n */
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fmadd fp4,fp5,fp2,fp4 /* fp4 = P3 * z + P1 */
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fmadd fp6,fp3,fp2,fp6 /* fp6 = P2 * z + P0 */
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mtvsrd v1,r3
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xscvspdp v1,v1
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fmul fp4,fp4,fp2 /* fp4 = (P3 * z + P1)*z */
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fmadd fp0,fp0,fp6,fp4 /* fp0 = P(y) */
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sldi r8,r8,3 /* Access doublewords from T[j]. */
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addi r6,DATA_OFFSET,(.Ttable-.Lanchor)
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lfdx fp3,r6,r8
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fmadd fp0,fp0,fp3,fp3 /* fp0 = T[j] * (1 + P(y)) */
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fmul fp1,fp1,fp0 /* fp1 = 2^n * T[j] * (1 + P(y)) */
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frsp fp1,fp1
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blr
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.align 4
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/* x is either underflow, overflow, infinite or NaN. */
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L(special_paths):
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srdi r8,r8,32
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rlwinm r8,r8,3,29,29 /* r8 = 0, if x positive.
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r8 = 4, otherwise. */
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addi r6,DATA_OFFSET,(.SPRANGE-.Lanchor)
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lwzx r4,r6,r8 /* r4 = .SPRANGE[signbit(x)] */
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cmpw r3,r4
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/* |x| <= .SPRANGE[signbit(x)] */
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ble L(near_under_or_overflow)
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lis r4,SP_INF@ha
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ori r4,r4,SP_INF@l
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cmpw r3,r4
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bge L(arg_inf_or_nan) /* |x| > Infinite ? */
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addi r6,DATA_OFFSET,(.SPLARGE_SMALL-.Lanchor)
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lfsx fp1,r6,r8
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fmuls fp1,fp1,fp1
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blr
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.align 4
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L(small_args):
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/* expf(x) = 1.0, where |x| < |2^(-28)| */
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lfs fp2,(.SPone-.Lanchor)(DATA_OFFSET)
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fadds fp1,fp1,fp2
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blr
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.align 4
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L(arg_inf_or_nan:)
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bne L(arg_nan)
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/* expf(+INF) = +INF
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expf(-INF) = 0 */
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addi r6,DATA_OFFSET,(.INF_ZERO-.Lanchor)
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lfsx fp1,r6,r8
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blr
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.align 4
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L(arg_nan):
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/* expf(NaN) = NaN */
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fadd fp1,fp1,fp1
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frsp fp1,fp1
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blr
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.align 4
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L(near_under_or_overflow):
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frsp fp6,fp2
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xscvdpsp v2,v2
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mfvsrd r8,v2
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mr r3,r8 /* r3 = m */
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rldicl r8,r8,32,58 /* r8 = j */
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lfs fp4,(.SP_RS-.Lanchor)(DATA_OFFSET)
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fsubs fp2,fp6,fp4 /* fp2 = m = x * K/log(2) */
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srdi r3,r3,32
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clrrwi r3,r3,6 /* r3 = n */
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lfd fp6,(.NLN2K-.Lanchor)(DATA_OFFSET)
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fmadd fp0,fp2,fp6,fp1 /* fp0 = y = x - m*log(2)/K */
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fmul fp2,fp0,fp0 /* fp2 = z = y^2 */
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lfd fp4,(.P1-.Lanchor)(DATA_OFFSET)
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lfd fp6,(.P0-.Lanchor)(DATA_OFFSET)
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ld r4,(.DP_EXP_BIAS-.Lanchor)(DATA_OFFSET)
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add r3,r3,r4
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rldic r3,r3,46,1 /* r3 = 2 */
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fmadd fp4,fp5,fp2,fp4 /* fp4 = P3 * z + P1 */
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fmadd fp6,fp3,fp2,fp6 /* fp6 = P2 * z + P0 */
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mtvsrd v1,r3
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fmul fp4,fp4,fp2 /* fp4 = (P3*z + P1)*z */
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fmadd fp0,fp0,fp6,fp4 /* fp0 = P(y) */
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sldi r8,r8,3 /* Access doublewords from T[j]. */
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addi r6,DATA_OFFSET,(.Ttable-.Lanchor)
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lfdx fp3,r6,r8
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fmadd fp0,fp0,fp3,fp3 /* fp0 = T[j] * (1 + T[j]) */
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fmul fp1,fp1,fp0 /* fp1 = 2^n * T[j] * (1 + T[j]) */
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frsp fp1,fp1
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blr
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END(__ieee754_expf)
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.section .rodata, "a",@progbits
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.Lanchor:
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.balign 8
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/* Table T[j] = 2^(j/K). Double precision. */
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.Ttable:
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.8byte 0x3ff0000000000000
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.8byte 0x3ff02c9a3e778061
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.8byte 0x3ff059b0d3158574
|
||||
.8byte 0x3ff0874518759bc8
|
||||
.8byte 0x3ff0b5586cf9890f
|
||||
.8byte 0x3ff0e3ec32d3d1a2
|
||||
.8byte 0x3ff11301d0125b51
|
||||
.8byte 0x3ff1429aaea92de0
|
||||
.8byte 0x3ff172b83c7d517b
|
||||
.8byte 0x3ff1a35beb6fcb75
|
||||
.8byte 0x3ff1d4873168b9aa
|
||||
.8byte 0x3ff2063b88628cd6
|
||||
.8byte 0x3ff2387a6e756238
|
||||
.8byte 0x3ff26b4565e27cdd
|
||||
.8byte 0x3ff29e9df51fdee1
|
||||
.8byte 0x3ff2d285a6e4030b
|
||||
.8byte 0x3ff306fe0a31b715
|
||||
.8byte 0x3ff33c08b26416ff
|
||||
.8byte 0x3ff371a7373aa9cb
|
||||
.8byte 0x3ff3a7db34e59ff7
|
||||
.8byte 0x3ff3dea64c123422
|
||||
.8byte 0x3ff4160a21f72e2a
|
||||
.8byte 0x3ff44e086061892d
|
||||
.8byte 0x3ff486a2b5c13cd0
|
||||
.8byte 0x3ff4bfdad5362a27
|
||||
.8byte 0x3ff4f9b2769d2ca7
|
||||
.8byte 0x3ff5342b569d4f82
|
||||
.8byte 0x3ff56f4736b527da
|
||||
.8byte 0x3ff5ab07dd485429
|
||||
.8byte 0x3ff5e76f15ad2148
|
||||
.8byte 0x3ff6247eb03a5585
|
||||
.8byte 0x3ff6623882552225
|
||||
.8byte 0x3ff6a09e667f3bcd
|
||||
.8byte 0x3ff6dfb23c651a2f
|
||||
.8byte 0x3ff71f75e8ec5f74
|
||||
.8byte 0x3ff75feb564267c9
|
||||
.8byte 0x3ff7a11473eb0187
|
||||
.8byte 0x3ff7e2f336cf4e62
|
||||
.8byte 0x3ff82589994cce13
|
||||
.8byte 0x3ff868d99b4492ed
|
||||
.8byte 0x3ff8ace5422aa0db
|
||||
.8byte 0x3ff8f1ae99157736
|
||||
.8byte 0x3ff93737b0cdc5e5
|
||||
.8byte 0x3ff97d829fde4e50
|
||||
.8byte 0x3ff9c49182a3f090
|
||||
.8byte 0x3ffa0c667b5de565
|
||||
.8byte 0x3ffa5503b23e255d
|
||||
.8byte 0x3ffa9e6b5579fdbf
|
||||
.8byte 0x3ffae89f995ad3ad
|
||||
.8byte 0x3ffb33a2b84f15fb
|
||||
.8byte 0x3ffb7f76f2fb5e47
|
||||
.8byte 0x3ffbcc1e904bc1d2
|
||||
.8byte 0x3ffc199bdd85529c
|
||||
.8byte 0x3ffc67f12e57d14b
|
||||
.8byte 0x3ffcb720dcef9069
|
||||
.8byte 0x3ffd072d4a07897c
|
||||
.8byte 0x3ffd5818dcfba487
|
||||
.8byte 0x3ffda9e603db3285
|
||||
.8byte 0x3ffdfc97337b9b5f
|
||||
.8byte 0x3ffe502ee78b3ff6
|
||||
.8byte 0x3ffea4afa2a490da
|
||||
.8byte 0x3ffefa1bee615a27
|
||||
.8byte 0x3fff50765b6e4540
|
||||
.8byte 0x3fffa7c1819e90d8
|
||||
|
||||
.KLN2:
|
||||
.8byte 0x40571547652b82fe /* Double precision K/log(2). */
|
||||
|
||||
/* Double precision polynomial coefficients. */
|
||||
.P0:
|
||||
.8byte 0x3fefffffffffe7c6
|
||||
.P1:
|
||||
.8byte 0x3fe00000008d6118
|
||||
.P2:
|
||||
.8byte 0x3fc55550da752d4f
|
||||
.P3:
|
||||
.8byte 0x3fa56420eb78fa85
|
||||
|
||||
.RS:
|
||||
.8byte 0x4168000000000000 /* Double precision 2^23 + 2^22. */
|
||||
.NLN2K:
|
||||
.8byte 0xbf862e42fefa39ef /* Double precision -log(2)/K. */
|
||||
.DP_EXP_BIAS:
|
||||
.8byte 0x000000000000ffc0 /* Double precision exponent bias. */
|
||||
|
||||
.balign 4
|
||||
.SPone:
|
||||
.4byte 0x3f800000 /* Single precision 1.0. */
|
||||
.SP_RS:
|
||||
.4byte 0x4b400000 /* Single precision 2^23 + 2^22. */
|
||||
|
||||
.SPRANGE: /* Single precision overflow/underflow bounds. */
|
||||
.4byte 0x42b17217 /* if x>this bound, then result overflows. */
|
||||
.4byte 0x42cff1b4 /* if x<this bound, then result underflows. */
|
||||
|
||||
.SPLARGE_SMALL:
|
||||
.4byte 0x71800000 /* 2^100. */
|
||||
.4byte 0x0d800000 /* 2^-100. */
|
||||
|
||||
.INF_ZERO:
|
||||
.4byte 0x7f800000 /* Single precision Inf. */
|
||||
.4byte 0 /* Single precision zero. */
|
||||
|
||||
strong_alias (__ieee754_expf, __expf_finite)
|
||||
@ -1 +0,0 @@
|
||||
#include <sysdeps/../math/w_expf.c>
|
||||
Loading…
Reference in New Issue
Block a user