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powerpc: refactor logb{f,l}
The power7 logb implementation does not show a performance gain on
ISA 2.07+ chips with faster floating-point to GRP instructions
(currently POWER8 and POWER9).
This patch moves the POWER7 implementation to generic one and enables
it for POWER7. It also add some cleanup to use inline floating-point
number instead of define them using static const.
The performance difference is for POWER9:
- Without patch:
"logb": {
"subnormal": {
"duration": 4.99202e+09,
"iterations": 8.83662e+08,
"max": 75.194,
"min": 5.501,
"mean": 5.64925
},
"normal": {
"duration": 4.97063e+09,
"iterations": 9.97094e+08,
"max": 46.489,
"min": 4.956,
"mean": 4.98512
}
}
- With patch:
"logb": {
"subnormal": {
"duration": 4.97226e+09,
"iterations": 9.92036e+08,
"max": 77.209,
"min": 4.892,
"mean": 5.01218
},
"normal": {
"duration": 4.96192e+09,
"iterations": 1.07545e+09,
"max": 12.361,
"min": 4.593,
"mean": 4.61382
}
}
The ifunc implementation is also enabled only for powerpc64.
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/power7/fpu/s_logb.c: Move to ...
* sysdeps/powerpc/fpu/s_logb.c: ... here. Use inline FP constants.
* sysdeps/powerpc/power7/fpu/s_logbf.c: Move to ...
* sysdeps/powerpc/fpu/s_logbf.c: ... here. Use inline FP constants.
* sysdeps/powerpc/power7/fpu/s_logbl.c: Move to ...
* sysdeps/powerpc/fpu/s_logbl.c: ... here. Use inline FP constants.
* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logb-power7.c:
Adjust implementation path.
* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbf-power7.c:
Adjust implementation path.
* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbl-power7.c:
Adjust implementation path.
* sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile
(libm-sysdep_routines): Add s_log* objects.
(CFLAGS-s_logbf-power7.c, CFLAGS-s_logbl-power7.c,
CFLAGS-s_logb-power7.c): New fule.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logb-power7.c: Move
to ...
* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logb-power7.c:
... here.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logb-ppc64.c: Move
to ...
* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logb-ppc64.c:
... here.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logb.c: Move to ...
* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logb.c: ... here.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbf-power7.c: Move
to ...
* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbf-power7.c:
... here.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbf-ppc64.c: Move
to ...
* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbf-ppc64.c:
... here.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbf.c: Move to ...
* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbf.c: ... here.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbl-power7.c: Move
to ...
* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbl-power7.c:
... here.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbl-ppc64.c: Move
to ...
* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbl-ppc64.c:
... here.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbl.c: Move to ...
* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbl.c: ... here.
* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile: Remove file.
* sysdeps/powerpc/powerpc64/power7/fpu/s_logb.c: Remove file.
* sysdeps/powerpc/powerpc64/power7/fpu/s_logbf.c: Likewise.
* sysdeps/powerpc/powerpc64/power7/fpu/s_logbl.c: Likewise.
Reviewed-by: Gabriel F. T. Gomes <gabrielftg@linux.ibm.com>
This commit is contained in:
Adhemerval Zanella
parent
105f2ed368
commit
6ea21bfe43
51
ChangeLog
51
ChangeLog
@ -1,5 +1,56 @@
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2019-07-08 Adhemerval Zanella <adhemerval.zanella@linaro.org>
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* sysdeps/powerpc/power7/fpu/s_logb.c: Move to ...
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* sysdeps/powerpc/fpu/s_logb.c: ... here. Use inline FP constants.
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* sysdeps/powerpc/power7/fpu/s_logbf.c: Move to ...
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* sysdeps/powerpc/fpu/s_logbf.c: ... here. Use inline FP constants.
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* sysdeps/powerpc/power7/fpu/s_logbl.c: Move to ...
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* sysdeps/powerpc/fpu/s_logbl.c: ... here. Use inline FP constants.
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* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logb-power7.c:
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Adjust implementation path.
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* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbf-power7.c:
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Adjust implementation path.
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* sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbl-power7.c:
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Adjust implementation path.
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* sysdeps/powerpc/powerpc64/be/fpu/multiarch/Makefile
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(libm-sysdep_routines): Add s_log* objects.
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(CFLAGS-s_logbf-power7.c, CFLAGS-s_logbl-power7.c,
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CFLAGS-s_logb-power7.c): New fule.
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* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logb-power7.c: Move
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to ...
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* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logb-power7.c:
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... here.
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* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logb-ppc64.c: Move
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to ...
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* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logb-ppc64.c:
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... here.
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* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logb.c: Move to ...
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* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logb.c: ... here.
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* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbf-power7.c: Move
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to ...
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* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbf-power7.c:
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... here.
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* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbf-ppc64.c: Move
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to ...
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* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbf-ppc64.c:
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... here.
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* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbf.c: Move to ...
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* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbf.c: ... here.
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* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbl-power7.c: Move
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to ...
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* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbl-power7.c:
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... here.
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* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbl-ppc64.c: Move
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to ...
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* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbl-ppc64.c:
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... here.
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* sysdeps/powerpc/powerpc64/fpu/multiarch/s_logbl.c: Move to ...
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* sysdeps/powerpc/powerpc64/be/fpu/multiarch/s_logbl.c: ... here.
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* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile: Remove file.
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* sysdeps/powerpc/powerpc64/power7/fpu/s_logb.c: Remove file.
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* sysdeps/powerpc/powerpc64/power7/fpu/s_logbf.c: Likewise.
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* sysdeps/powerpc/powerpc64/power7/fpu/s_logbl.c: Likewise.
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* sysdeps/ieee754/dbl-64/wordsize-64/s_logb.c: Move to ...
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* sysdeps/ieee754/dbl-64/s_logb.c: ... here. Add work around for
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powerpc32 integer 0 converting to -0.
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@ -1,4 +1,4 @@
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/* logb(). PowerPC/POWER7 version.
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/* Get exponent of a floating-point value. PowerPC version.
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Copyright (C) 2012-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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@ -16,59 +16,49 @@
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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 <libm-alias-double.h>
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/* ISA 2.07 provides fast GPR to FP instruction (mfvsr{d,wz}) which make
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generic implementation faster. */
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#if defined(_ARCH_PWR8) || !defined(_ARCH_PWR7)
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# include <sysdeps/ieee754/dbl-64/s_logb.c>
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#else
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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 <libm-alias-double.h>
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/* This implementation avoids FP to INT conversions by using VSX
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bitwise instructions over FP values. */
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static const double two1div52 = 2.220446049250313e-16; /* 1/2**52 */
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static const double two10m1 = -1023.0; /* 2**10 -1 */
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/* FP mask to extract the exponent. */
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static const union {
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unsigned long long mask;
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double d;
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} mask = { 0x7ff0000000000000ULL };
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double
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__logb (double x)
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{
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double ret;
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if (__builtin_expect (x == 0.0, 0))
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if (__glibc_unlikely (x == 0.0))
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/* Raise FE_DIVBYZERO and return -HUGE_VAL[LF]. */
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return -1.0 / __builtin_fabs (x);
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return -1.0 / fabs (x);
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/* ret = x & 0x7ff0000000000000; */
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asm (
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"xxland %x0,%x1,%x2\n"
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"fcfid %0,%0"
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: "=f" (ret)
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: "f" (x), "f" (mask.d));
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/* ret = (ret >> 52) - 1023.0; */
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ret = (ret * two1div52) + two10m1;
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if (__builtin_expect (ret > -two10m1, 0))
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/* Mask to extract the exponent. */
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asm ("xxland %x0,%x1,%x2\n"
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"fcfid %0,%0"
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: "=d" (ret)
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: "d" (x), "d" (0x7ff0000000000000ULL));
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ret = (ret * 0x1p-52) - 1023.0;
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if (ret > 1023.0)
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/* Multiplication is used to set logb (+-INF) = INF. */
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return (x * x);
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else if (__builtin_expect (ret == two10m1, 0))
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else if (ret == -1023.0)
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{
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/* POSIX specifies that denormal numbers are treated as
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though they were normalized. */
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int32_t lx, ix;
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int ma;
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EXTRACT_WORDS (ix, lx, x);
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ix &= 0x7fffffff;
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if (ix == 0)
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ma = __builtin_clz (lx) + 32;
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else
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ma = __builtin_clz (ix);
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return (double) (-1023 - (ma - 12));
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int64_t ix;
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EXTRACT_WORDS64 (ix, x);
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ix &= UINT64_C (0x7fffffffffffffff);
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return (double) (-1023 - (__builtin_clzll (ix) - 12));
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}
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/* Test to avoid logb_downward (0.0) == -0.0. */
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return ret == -0.0 ? 0.0 : ret;
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}
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# ifndef __logb
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libm_alias_double (__logb, logb)
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# endif
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#endif
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@ -1,4 +1,4 @@
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/* logbf(). PowerPC/POWER7 version.
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/* Get exponent of a floating-point value. PowerPC version.
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Copyright (C) 2012-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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@ -16,40 +16,33 @@
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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 <libm-alias-float.h>
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/* ISA 2.07 provides fast GPR to FP instruction (mfvsr{d,wz}) which make
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generic implementation faster. */
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#if defined(_ARCH_PWR8) || !defined(_ARCH_PWR7)
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# include <sysdeps/ieee754/flt-32/s_logbf.c>
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#else
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# include <math.h>
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# include <libm-alias-float.h>
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/* This implementation avoids FP to INT conversions by using VSX
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bitwise instructions over FP values. */
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static const double two1div52 = 2.220446049250313e-16; /* 1/2**52 */
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static const double two10m1 = -1023.0; /* -2**10 + 1 */
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static const double two7m1 = -127.0; /* -2**7 + 1 */
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/* FP mask to extract the exponent. */
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static const union {
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unsigned long long mask;
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double d;
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} mask = { 0x7ff0000000000000ULL };
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float
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__logbf (float x)
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{
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/* VSX operation are all done internally as double. */
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double ret;
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if (__builtin_expect (x == 0.0, 0))
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if (__glibc_unlikely (x == 0.0))
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/* Raise FE_DIVBYZERO and return -HUGE_VAL[LF]. */
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return -1.0 / __builtin_fabsf (x);
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return -1.0 / fabs (x);
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/* ret = x & 0x7f800000; */
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asm (
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"xxland %x0,%x1,%x2\n"
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"fcfid %0,%0"
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: "=f"(ret)
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: "f" (x), "f" (mask.d));
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/* mask to extract the exponent. */
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asm ("xxland %x0,%x1,%x2\n"
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"fcfid %0,%0"
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: "=d"(ret)
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: "d" (x), "d" (0x7ff0000000000000ULL));
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/* ret = (ret >> 52) - 1023.0, since ret is double. */
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ret = (ret * two1div52) + two10m1;
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if (__builtin_expect (ret > -two7m1, 0))
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ret = (ret * 0x1p-52) - 1023.0;
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if (ret > 127.0)
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/* Multiplication is used to set logb (+-INF) = INF. */
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return (x * x);
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/* Since operations are done with double we don't need
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@ -57,4 +50,7 @@ __logbf (float x)
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The test is to avoid logb_downward (0.0) == -0.0. */
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return ret == -0.0 ? 0.0 : ret;
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}
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# ifndef __logbf
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libm_alias_float (__logb, logb)
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# endif
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#endif
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@ -1,4 +1,4 @@
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/* logbl(). PowerPC/POWER7 version.
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/* Get exponent of a floating-point value. PowerPC version.
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Copyright (C) 2012-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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@ -16,22 +16,17 @@
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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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/* ISA 2.07 provides fast GPR to FP instruction (mfvsr{d,wz}) which make
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generic implementation faster. */
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#if defined(_ARCH_PWR8) || !defined(_ARCH_PWR7)
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# include <./sysdeps/ieee754/ldbl-128ibm/s_logbl.c>
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#else
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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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/* This implementation avoids FP to INT conversions by using VSX
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bitwise instructions over FP values. */
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static const double two1div52 = 2.220446049250313e-16; /* 1/2**52 */
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static const double two10m1 = -1023.0; /* 2**10 -1 */
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/* FP mask to extract the exponent. */
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static const union {
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unsigned long long mask;
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double d;
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} mask = { 0x7ff0000000000000ULL };
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long double
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__logbl (long double x)
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{
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@ -39,24 +34,23 @@ __logbl (long double x)
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double ret;
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int64_t hx;
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if (__builtin_expect (x == 0.0L, 0))
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if (__glibc_unlikely (x == 0.0))
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/* Raise FE_DIVBYZERO and return -HUGE_VAL[LF]. */
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return -1.0L / __builtin_fabsl (x);
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ldbl_unpack (x, &xh, &xl);
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EXTRACT_WORDS64 (hx, xh);
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/* ret = x & 0x7ff0000000000000; */
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asm (
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"xxland %x0,%x1,%x2\n"
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"fcfid %0,%0"
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: "=f" (ret)
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: "f" (xh), "f" (mask.d));
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/* ret = (ret >> 52) - 1023.0; */
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ret = (ret * two1div52) + two10m1;
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if (__builtin_expect (ret > -two10m1, 0))
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/* Mask to extract the exponent. */
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asm ("xxland %x0,%x1,%x2\n"
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"fcfid %0,%0"
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: "=d" (ret)
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: "d" (xh), "d" (0x7ff0000000000000ULL));
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ret = (ret * 0x1p-52) - 1023.0;
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if (ret > 1023.0)
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/* Multiplication is used to set logb (+-INF) = INF. */
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return (xh * xh);
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else if (__builtin_expect (ret == two10m1, 0))
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else if (ret == -1023.0)
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{
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/* POSIX specifies that denormal number is treated as
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though it were normalized. */
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@ -78,6 +72,7 @@ __logbl (long double x)
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/* Test to avoid logb_downward (0.0) == -0.0. */
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return ret == -0.0 ? 0.0 : ret;
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}
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#ifndef __logbl
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# ifndef __logbl
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long_double_symbol (libm, __logbl, logbl);
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# endif
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#endif
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@ -16,16 +16,5 @@
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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_ldbl_opt.h>
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#undef weak_alias
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#define weak_alias(a, b)
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#undef strong_alias
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#define strong_alias(a, b)
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#undef compat_symbol
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#define compat_symbol(lib, name, alias, ver)
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#define __logb __logb_power7
|
||||
|
||||
#include <sysdeps/powerpc/power7/fpu/s_logb.c>
|
||||
#include <sysdeps/powerpc/fpu/s_logb.c>
|
||||
|
||||
@ -16,11 +16,5 @@
|
||||
License along with the GNU C Library; if not, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#include <math.h>
|
||||
|
||||
#undef weak_alias
|
||||
#define weak_alias(a, b)
|
||||
|
||||
#define __logbf __logbf_power7
|
||||
|
||||
#include <sysdeps/powerpc/power7/fpu/s_logbf.c>
|
||||
#include <sysdeps/powerpc/fpu/s_logbf.c>
|
||||
|
||||
@ -17,5 +17,4 @@
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#define __logbl __logbl_power7
|
||||
|
||||
#include <sysdeps/powerpc/power7/fpu/s_logbl.c>
|
||||
#include <sysdeps/powerpc/fpu/s_logbl.c>
|
||||
|
||||
@ -32,6 +32,12 @@ libm-sysdep_routines += s_ceil-power5+ \
|
||||
s_llround-power5+ \
|
||||
s_llround-ppc64 \
|
||||
s_llroundf-ppc64 \
|
||||
s_logb-power7 \
|
||||
s_logbf-power7 \
|
||||
s_logbl-power7 \
|
||||
s_logb-ppc64 \
|
||||
s_logbf-ppc64 \
|
||||
s_logbl-ppc64 \
|
||||
$(sysdep_calls:s_%=m_%)
|
||||
|
||||
CFLAGS-s_ceil-power5+.c = -mcpu=power5+
|
||||
@ -50,6 +56,10 @@ CFLAGS-s_llround-power5+.c += -mcpu=power5+
|
||||
|
||||
CFLAGS-s_modf-power5+.c += -mcpu=power5+
|
||||
CFLAGS-s_modff-power5+.c += -mcpu=power5+
|
||||
CFLAGS-s_logbf-power7.c = -mcpu=power7
|
||||
CFLAGS-s_logbl-power7.c = -mcpu=power7
|
||||
CFLAGS-s_logb-power7.c = -mcpu=power7
|
||||
|
||||
# These files quiet sNaNs in a way that is optimized away without
|
||||
# -fsignaling-nans.
|
||||
CFLAGS-s_modf-ppc64.c += -fsignaling-nans
|
||||
|
||||
@ -16,4 +16,5 @@
|
||||
License along with the GNU C Library; if not, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#include <sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logb-power7.c>
|
||||
#define __logb __logb_power7
|
||||
#include <sysdeps/powerpc/fpu/s_logb.c>
|
||||
@ -16,4 +16,5 @@
|
||||
License along with the GNU C Library; if not, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#include <sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbf-power7.c>
|
||||
#define __logbf __logbf_power7
|
||||
#include <sysdeps/powerpc/fpu/s_logbf.c>
|
||||
@ -16,4 +16,5 @@
|
||||
License along with the GNU C Library; if not, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#include <sysdeps/powerpc/powerpc32/power4/fpu/multiarch/s_logbl-power7.c>
|
||||
#define __logbl __logbl_power7
|
||||
#include <sysdeps/powerpc/fpu/s_logbl.c>
|
||||
@ -1,11 +0,0 @@
|
||||
ifeq ($(subdir),math)
|
||||
sysdep_routines += $(sysdep_calls)
|
||||
libm-sysdep_routines += s_logb-power7 s_logbf-power7 \
|
||||
s_logbl-power7 s_logb-ppc64 s_logbf-ppc64 \
|
||||
s_logbl-ppc64 \
|
||||
$(sysdep_calls:s_%=m_%)
|
||||
|
||||
CFLAGS-s_logbf-power7.c = -mcpu=power7
|
||||
CFLAGS-s_logbl-power7.c = -mcpu=power7
|
||||
CFLAGS-s_logb-power7.c = -mcpu=power7
|
||||
endif
|
||||
@ -1 +0,0 @@
|
||||
#include <sysdeps/powerpc/power7/fpu/s_logb.c>
|
||||
@ -1 +0,0 @@
|
||||
#include <sysdeps/powerpc/power7/fpu/s_logbf.c>
|
||||
@ -1 +0,0 @@
|
||||
#include <sysdeps/powerpc/power7/fpu/s_logbl.c>
|
||||
Loading…
Reference in New Issue
Block a user