s_sinf.c revision 8870
12116Sjkh/* s_sinf.c -- float version of s_sin.c. 22116Sjkh * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 32116Sjkh */ 42116Sjkh 52116Sjkh/* 62116Sjkh * ==================================================== 72116Sjkh * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 82116Sjkh * 92116Sjkh * Developed at SunPro, a Sun Microsystems, Inc. business. 102116Sjkh * Permission to use, copy, modify, and distribute this 118870Srgrimes * software is freely granted, provided that this notice 122116Sjkh * is preserved. 132116Sjkh * ==================================================== 142116Sjkh */ 152116Sjkh 162116Sjkh#ifndef lint 178870Srgrimesstatic char rcsid[] = "$Id: s_sinf.c,v 1.1.1.1 1994/08/19 09:39:58 jkh Exp $"; 182116Sjkh#endif 192116Sjkh 202116Sjkh#include "math.h" 212116Sjkh#include "math_private.h" 222116Sjkh 232116Sjkh#ifdef __STDC__ 242116Sjkh float sinf(float x) 252116Sjkh#else 262116Sjkh float sinf(x) 272116Sjkh float x; 282116Sjkh#endif 292116Sjkh{ 302116Sjkh float y[2],z=0.0; 312116Sjkh int32_t n, ix; 322116Sjkh 332116Sjkh GET_FLOAT_WORD(ix,x); 342116Sjkh 352116Sjkh /* |x| ~< pi/4 */ 362116Sjkh ix &= 0x7fffffff; 372116Sjkh if(ix <= 0x3f490fd8) return __kernel_sinf(x,z,0); 382116Sjkh 392116Sjkh /* sin(Inf or NaN) is NaN */ 402116Sjkh else if (ix>=0x7f800000) return x-x; 412116Sjkh 422116Sjkh /* argument reduction needed */ 432116Sjkh else { 442116Sjkh n = __ieee754_rem_pio2f(x,y); 452116Sjkh switch(n&3) { 462116Sjkh case 0: return __kernel_sinf(y[0],y[1],1); 472116Sjkh case 1: return __kernel_cosf(y[0],y[1]); 482116Sjkh case 2: return -__kernel_sinf(y[0],y[1],1); 492116Sjkh default: 502116Sjkh return -__kernel_cosf(y[0],y[1]); 512116Sjkh } 522116Sjkh } 532116Sjkh} 54