s_sinf.c revision 97409
175584Sru/* s_sinf.c -- float version of s_sin.c.
275584Sru * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3104862Sru */
475584Sru
575584Sru/*
675584Sru * ====================================================
775584Sru * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
875584Sru *
975584Sru * Developed at SunPro, a Sun Microsystems, Inc. business.
1075584Sru * Permission to use, copy, modify, and distribute this
1175584Sru * software is freely granted, provided that this notice
1275584Sru * is preserved.
1375584Sru * ====================================================
1475584Sru */
1575584Sru
16#ifndef lint
17static char rcsid[] = "$FreeBSD: head/lib/msun/src/s_sinf.c 97409 2002-05-28 17:51:46Z alfred $";
18#endif
19
20#include "math.h"
21#include "math_private.h"
22
23	float sinf(float x)
24{
25	float y[2],z=0.0;
26	int32_t n, ix;
27
28	GET_FLOAT_WORD(ix,x);
29
30    /* |x| ~< pi/4 */
31	ix &= 0x7fffffff;
32	if(ix <= 0x3f490fd8) return __kernel_sinf(x,z,0);
33
34    /* sin(Inf or NaN) is NaN */
35	else if (ix>=0x7f800000) return x-x;
36
37    /* argument reduction needed */
38	else {
39	    n = __ieee754_rem_pio2f(x,y);
40	    switch(n&3) {
41		case 0: return  __kernel_sinf(y[0],y[1],1);
42		case 1: return  __kernel_cosf(y[0],y[1]);
43		case 2: return -__kernel_sinf(y[0],y[1],1);
44		default:
45			return -__kernel_cosf(y[0],y[1]);
46	    }
47	}
48}
49