s_sinf.c revision 97409
1194179Sed/* s_sinf.c -- float version of s_sin.c. 2194179Sed * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 3194179Sed */ 4194179Sed 5194179Sed/* 6194179Sed * ==================================================== 7194179Sed * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 8194179Sed * 9194179Sed * Developed at SunPro, a Sun Microsystems, Inc. business. 10194179Sed * Permission to use, copy, modify, and distribute this 11194179Sed * software is freely granted, provided that this notice 12194179Sed * is preserved. 13194179Sed * ==================================================== 14194179Sed */ 15194179Sed 16194179Sed#ifndef lint 17194179Sedstatic char rcsid[] = "$FreeBSD: head/lib/msun/src/s_sinf.c 97409 2002-05-28 17:51:46Z alfred $"; 18194179Sed#endif 19194179Sed 20194179Sed#include "math.h" 21194179Sed#include "math_private.h" 22194179Sed 23194179Sed float sinf(float x) 24194179Sed{ 25194179Sed float y[2],z=0.0; 26194179Sed int32_t n, ix; 27194179Sed 28194179Sed GET_FLOAT_WORD(ix,x); 29194179Sed 30194179Sed /* |x| ~< pi/4 */ 31194179Sed ix &= 0x7fffffff; 32218893Sdim if(ix <= 0x3f490fd8) return __kernel_sinf(x,z,0); 33218893Sdim 34249423Sdim /* sin(Inf or NaN) is NaN */ 35194179Sed else if (ix>=0x7f800000) return x-x; 36194179Sed 37239462Sdim /* argument reduction needed */ 38239462Sdim else { 39198092Srdivacky n = __ieee754_rem_pio2f(x,y); 40226633Sdim switch(n&3) { 41194179Sed case 0: return __kernel_sinf(y[0],y[1],1); 42198092Srdivacky case 1: return __kernel_cosf(y[0],y[1]); 43198092Srdivacky case 2: return -__kernel_sinf(y[0],y[1],1); 44227737Sdim default: 45243830Sdim return -__kernel_cosf(y[0],y[1]); 46194179Sed } 47194179Sed } 48218893Sdim} 49194179Sed