1 /* s_sinf.c -- float version of s_sin.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5 /*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
16 #include "math.h"
17 #include "math_private.h"
18
19 float
sinf(float x)20 sinf(float x)
21 {
22 float y[2],z=0.0;
23 int32_t n, ix;
24
25 GET_FLOAT_WORD(ix,x);
26
27 /* |x| ~< pi/4 */
28 ix &= 0x7fffffff;
29 if(ix <= 0x3f490fd8) return __kernel_sinf(x,z,0);
30
31 /* sin(Inf or NaN) is NaN */
32 else if (ix>=0x7f800000) return x-x;
33
34 /* argument reduction needed */
35 else {
36 n = __ieee754_rem_pio2f(x,y);
37 switch(n&3) {
38 case 0: return __kernel_sinf(y[0],y[1],1);
39 case 1: return __kernel_cosf(y[0],y[1]);
40 case 2: return -__kernel_sinf(y[0],y[1],1);
41 default:
42 return -__kernel_cosf(y[0],y[1]);
43 }
44 }
45 }
46