1*05a0b428SJohn Marino /* s_sinf.c -- float version of s_sin.c.
2*05a0b428SJohn Marino * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3*05a0b428SJohn Marino */
4*05a0b428SJohn Marino
5*05a0b428SJohn Marino /*
6*05a0b428SJohn Marino * ====================================================
7*05a0b428SJohn Marino * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8*05a0b428SJohn Marino *
9*05a0b428SJohn Marino * Developed at SunPro, a Sun Microsystems, Inc. business.
10*05a0b428SJohn Marino * Permission to use, copy, modify, and distribute this
11*05a0b428SJohn Marino * software is freely granted, provided that this notice
12*05a0b428SJohn Marino * is preserved.
13*05a0b428SJohn Marino * ====================================================
14*05a0b428SJohn Marino */
15*05a0b428SJohn Marino
16*05a0b428SJohn Marino #include "math.h"
17*05a0b428SJohn Marino #include "math_private.h"
18*05a0b428SJohn Marino
19*05a0b428SJohn Marino float
sinf(float x)20*05a0b428SJohn Marino sinf(float x)
21*05a0b428SJohn Marino {
22*05a0b428SJohn Marino float y[2],z=0.0;
23*05a0b428SJohn Marino int32_t n, ix;
24*05a0b428SJohn Marino
25*05a0b428SJohn Marino GET_FLOAT_WORD(ix,x);
26*05a0b428SJohn Marino
27*05a0b428SJohn Marino /* |x| ~< pi/4 */
28*05a0b428SJohn Marino ix &= 0x7fffffff;
29*05a0b428SJohn Marino if(ix <= 0x3f490fd8) return __kernel_sinf(x,z,0);
30*05a0b428SJohn Marino
31*05a0b428SJohn Marino /* sin(Inf or NaN) is NaN */
32*05a0b428SJohn Marino else if (ix>=0x7f800000) return x-x;
33*05a0b428SJohn Marino
34*05a0b428SJohn Marino /* argument reduction needed */
35*05a0b428SJohn Marino else {
36*05a0b428SJohn Marino n = __ieee754_rem_pio2f(x,y);
37*05a0b428SJohn Marino switch(n&3) {
38*05a0b428SJohn Marino case 0: return __kernel_sinf(y[0],y[1],1);
39*05a0b428SJohn Marino case 1: return __kernel_cosf(y[0],y[1]);
40*05a0b428SJohn Marino case 2: return -__kernel_sinf(y[0],y[1],1);
41*05a0b428SJohn Marino default:
42*05a0b428SJohn Marino return -__kernel_cosf(y[0],y[1]);
43*05a0b428SJohn Marino }
44*05a0b428SJohn Marino }
45*05a0b428SJohn Marino }
46