diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2017-10-22 07:58:54 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-10-22 08:00:18 -0700 |
| commit | 7eda65f69e0e4533b76ca4614fe516de03fe2b3a (patch) | |
| tree | 0b81497d81ea5be20c8a130f92c62f245a4e2089 /sysdeps/i386/fpu | |
| parent | 5d15c9697577d2c342b5ade820bfd7b84a736b23 (diff) | |
| download | glibc-7eda65f69e0e4533b76ca4614fe516de03fe2b3a.tar glibc-7eda65f69e0e4533b76ca4614fe516de03fe2b3a.tar.gz glibc-7eda65f69e0e4533b76ca4614fe516de03fe2b3a.tar.bz2 glibc-7eda65f69e0e4533b76ca4614fe516de03fe2b3a.zip | |
i386: Replace assembly versions of e_exp2f with generic e_exp2f.c
This patch replaces i386 assembly versions of e_exp2f with generic
e_exp2f.c. For workload-spec2017.wrf, on Nehalem, it improves
performance by:
Before After Improvement
reciprocal-throughput 112.996 40.0454 182%
latency 126.581 54.4479 132%
On Skylake, it improves performance by:
Before After Improvement
reciprocal-throughput 113.14 39.447 186%
latency 136.068 55.684 144%
On IvyBridge with --disable-multi-arch, it improves performance by:
Before After Improvement
reciprocal-throughput 132.521 40.3759 228%
latency 145.791 58.4587 149%
* sysdeps/i386/fpu/e_exp2f.S: Removed.
* sysdeps/i386/fpu/w_exp2f.c: Likewise.
* sysdeps/i386/fpu/libm-test-ulps: Updated for generic e_exp2f.c.
* sysdeps/i386/i686/fpu/multiarch/libm-test-ulps: Likewise.
* sysdeps/i386/i686/fpu/multiarch/Makefile (libm-sysdep_routines):
Add e_exp2f-sse2.
(CFLAGS-e_exp2f-sse2.c): New.
* sysdeps/i386/i686/fpu/multiarch/e_exp2f-sse2.c: New file.
* sysdeps/i386/i686/fpu/multiarch/e_exp2f.c: Likewise.
Diffstat (limited to 'sysdeps/i386/fpu')
| -rw-r--r-- | sysdeps/i386/fpu/e_exp2f.S | 52 | ||||
| -rw-r--r-- | sysdeps/i386/fpu/libm-test-ulps | 2 | ||||
| -rw-r--r-- | sysdeps/i386/fpu/w_exp2f.c | 1 |
3 files changed, 2 insertions, 53 deletions
diff --git a/sysdeps/i386/fpu/e_exp2f.S b/sysdeps/i386/fpu/e_exp2f.S deleted file mode 100644 index 30623cd850..0000000000 --- a/sysdeps/i386/fpu/e_exp2f.S +++ /dev/null @@ -1,52 +0,0 @@ -/* - * Written by J.T. Conklin <jtc@netbsd.org>. - * Adapted for exp2 by Ulrich Drepper <drepper@cygnus.com>. - * Public domain. - */ - -#include <machine/asm.h> -#include <i386-math-asm.h> - -DEFINE_FLT_MIN - -#ifdef PIC -# define MO(op) op##@GOTOFF(%ecx) -#else -# define MO(op) op -#endif - - .text -ENTRY(__ieee754_exp2f) -#ifdef PIC - LOAD_PIC_REG (cx) -#endif - flds 4(%esp) -/* I added the following ugly construct because exp(+-Inf) resulted - in NaN. The ugliness results from the bright minds at Intel. - For the i686 the code can be written better. - -- drepper@cygnus.com. */ - fxam /* Is NaN or +-Inf? */ - fstsw %ax - movb $0x45, %dh - andb %ah, %dh - cmpb $0x05, %dh - je 1f /* Is +-Inf, jump. */ - fld %st - frndint /* int(x) */ - fsubr %st,%st(1) /* fract(x) */ - fxch - f2xm1 /* 2^(fract(x)) - 1 */ - fld1 - faddp /* 2^(fract(x)) */ - fscale /* e^x */ - fstp %st(1) - FLT_NARROW_EVAL_UFLOW_NONNEG_NAN - ret - -1: testl $0x200, %eax /* Test sign. */ - jz 2f /* If positive, jump. */ - fstp %st - fldz /* Set result to 0. */ -2: ret -END (__ieee754_exp2f) -strong_alias (__ieee754_exp2f, __exp2f_finite) diff --git a/sysdeps/i386/fpu/libm-test-ulps b/sysdeps/i386/fpu/libm-test-ulps index c826b29c2c..0aa18ea9b7 100644 --- a/sysdeps/i386/fpu/libm-test-ulps +++ b/sysdeps/i386/fpu/libm-test-ulps @@ -1921,7 +1921,9 @@ ildouble: 1 ldouble: 1 Function: "exp2_upward": +float: 1 float128: 2 +ifloat: 1 ifloat128: 2 ildouble: 1 ldouble: 1 diff --git a/sysdeps/i386/fpu/w_exp2f.c b/sysdeps/i386/fpu/w_exp2f.c deleted file mode 100644 index 583065d12a..0000000000 --- a/sysdeps/i386/fpu/w_exp2f.c +++ /dev/null @@ -1 +0,0 @@ -#include <sysdeps/../math/w_exp2f.c> |