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| author | Wilco Dijkstra <wdijkstr@arm.com> | 2018-08-15 16:01:21 +0100 |
|---|---|---|
| committer | Wilco Dijkstra <wdijkstr@arm.com> | 2018-08-15 16:01:21 +0100 |
| commit | 126c4e3f804881f9fbc4eb71787f41793d2d7be5 (patch) | |
| tree | a8925aeea4de10fc9fdf788cabc89118e06cd892 /sysdeps/ieee754/flt-32/k_sinf.c | |
| parent | 49acec179ca9fb2da961b78f56ef5ce501bbb50b (diff) | |
| download | glibc-126c4e3f804881f9fbc4eb71787f41793d2d7be5.tar glibc-126c4e3f804881f9fbc4eb71787f41793d2d7be5.tar.gz glibc-126c4e3f804881f9fbc4eb71787f41793d2d7be5.tar.bz2 glibc-126c4e3f804881f9fbc4eb71787f41793d2d7be5.zip | |
Use generic sinf/cosf in lgammaf_r
The internal functions __kernel_sinf and __kernel_cosf are used only by
lgammaf_r. Removing the internal functions and using the generic sinf
and cosf is better overall. Benchmarking on Cortex-A72 shows the generic
sinf and cosf are 1.4x and 2.3x faster in the range |x| < PI/4, and 0.66x
and 1.1x for |x| < PI/2, so it should make lgammaf_r faster on average.
GLIBC regression tests pass on AArch64.
* sysdeps/ieee754/flt-32/e_lgammaf_r.c (sin_pif): Use __sinf/__cosf.
* sysdeps/ieee754/flt-32/k_cosf.c (__kernel_cosf): Remove all code.
* sysdeps/ieee754/flt-32/k_sinf.c (__kernel_sinf): Likewise.
Diffstat (limited to 'sysdeps/ieee754/flt-32/k_sinf.c')
| -rw-r--r-- | sysdeps/ieee754/flt-32/k_sinf.c | 52 |
1 files changed, 1 insertions, 51 deletions
diff --git a/sysdeps/ieee754/flt-32/k_sinf.c b/sysdeps/ieee754/flt-32/k_sinf.c index dcf3c35358..1cc8931700 100644 --- a/sysdeps/ieee754/flt-32/k_sinf.c +++ b/sysdeps/ieee754/flt-32/k_sinf.c @@ -1,51 +1 @@ -/* k_sinf.c -- float version of k_sin.c - * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. - */ - -/* - * ==================================================== - * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. - * - * Developed at SunPro, a Sun Microsystems, Inc. business. - * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice - * is preserved. - * ==================================================== - */ - -#if defined(LIBM_SCCS) && !defined(lint) -static char rcsid[] = "$NetBSD: k_sinf.c,v 1.4 1995/05/10 20:46:33 jtc Exp $"; -#endif - -#include <float.h> -#include <math.h> -#include <math_private.h> -#include <math-underflow.h> - -static const float -half = 5.0000000000e-01,/* 0x3f000000 */ -S1 = -1.6666667163e-01, /* 0xbe2aaaab */ -S2 = 8.3333337680e-03, /* 0x3c088889 */ -S3 = -1.9841270114e-04, /* 0xb9500d01 */ -S4 = 2.7557314297e-06, /* 0x3638ef1b */ -S5 = -2.5050759689e-08, /* 0xb2d72f34 */ -S6 = 1.5896910177e-10; /* 0x2f2ec9d3 */ - -float __kernel_sinf(float x, float y, int iy) -{ - float z,r,v; - int32_t ix; - GET_FLOAT_WORD(ix,x); - ix &= 0x7fffffff; /* high word of x */ - if(ix<0x32000000) /* |x| < 2**-27 */ - { - math_check_force_underflow (x); - if ((int) x == 0) - return x; /* generate inexact */ - } - z = x*x; - v = z*x; - r = S2+z*(S3+z*(S4+z*(S5+z*S6))); - if(iy==0) return x+v*(S1+z*r); - else return x-((z*(half*y-v*r)-y)-v*S1); -} +/* Not needed. */ |