mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 20:51:11 +00:00
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
|
/* 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 "math.h"
|
||
|
|
#include "math_private.h"
|
||
|
|
|
||
|
|
#ifdef __STDC__
|
||
|
|
static const float
|
||
|
|
#else
|
||
|
|
static float
|
||
|
|
#endif
|
||
|
|
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 */
|
||
|
|
|
||
|
|
#ifdef __STDC__
|
||
|
|
float __kernel_sinf(float x, float y, int iy)
|
||
|
|
#else
|
||
|
|
float __kernel_sinf(x, y, iy)
|
||
|
|
float x,y; int iy; /* iy=0 if y is zero */
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
float z,r,v;
|
||
|
|
int32_t ix;
|
||
|
|
GET_FLOAT_WORD(ix,x);
|
||
|
|
ix &= 0x7fffffff; /* high word of x */
|
||
|
|
if(ix<0x32000000) /* |x| < 2**-27 */
|
||
|
|
{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);
|
||
|
|
}
|