1 /* origin: FreeBSD /usr/src/lib/msun/src/s_sinf.c */
3 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
4 * Optimized by Bruce D. Evans.
7 * ====================================================
8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
10 * Developed at SunPro, a Sun Microsystems, Inc. business.
11 * Permission to use, copy, modify, and distribute this
12 * software is freely granted, provided that this notice
14 * ====================================================
19 /* Small multiples of pi/2 rounded to double precision. */
21 s1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */
22 s2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */
23 s3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */
24 s4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */
26 void sincosf(float x, float *sin, float *cos)
33 GET_FLOAT_WORD(ix, x);
38 if (ix <= 0x3f490fda) {
40 if (ix < 0x39800000) {
41 /* raise inexact if x!=0 and underflow if subnormal */
42 FORCE_EVAL(ix < 0x00100000 ? x/0x1p120f : x+0x1p120f);
53 if (ix <= 0x407b53d1) {
54 if (ix <= 0x4016cbe3) { /* |x| ~<= 3pi/4 */
56 *sin = -__cosdf(x + s1pio2);
57 *cos = __sindf(x + s1pio2);
59 *sin = __cosdf(s1pio2 - x);
60 *cos = __sindf(s1pio2 - x);
64 /* -sin(x+c) is not correct if x+c could be 0: -0 vs +0 */
65 *sin = -__sindf(sign ? x + s2pio2 : x - s2pio2);
66 *cos = -__cosdf(sign ? x + s2pio2 : x - s2pio2);
71 if (ix <= 0x40e231d5) {
72 if (ix <= 0x40afeddf) { /* |x| ~<= 7*pi/4 */
74 *sin = __cosdf(x + s3pio2);
75 *cos = -__sindf(x + s3pio2);
77 *sin = -__cosdf(x - s3pio2);
78 *cos = __sindf(x - s3pio2);
82 *sin = __sindf(sign ? x + s4pio2 : x - s4pio2);
83 *cos = __cosdf(sign ? x + s4pio2 : x - s4pio2);
87 /* sin(Inf or NaN) is NaN */
88 if (ix >= 0x7f800000) {
93 /* general argument reduction needed */
94 n = __rem_pio2f(x, &y);