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)
31 GET_FLOAT_WORD(hx, x);
35 if (ix <= 0x3f490fda) {
37 if (ix < 0x39800000) {
38 /* raise inexact if x != 0 */
51 if (ix <= 0x407b53d1) {
52 if (ix <= 0x4016cbe3) { /* |x| ~<= 3pi/4 */
53 if (hx < 0x80000000) {
54 *sin = __cosdf(x - s1pio2);
55 *cos = __sindf(s1pio2 - x);
57 *sin = -__cosdf(x + s1pio2);
58 *cos = __sindf(x + s1pio2);
62 *sin = __sindf(hx < 0x80000000 ? s2pio2 - x : -s2pio2 - x);
63 *cos = -__cosdf(hx < 0x80000000 ? x - s2pio2 : x + s2pio2);
68 if (ix <= 0x40e231d5) {
69 if (ix <= 0x40afeddf) { /* |x| ~<= 7*pi/4 */
70 if (hx < 0x80000000) {
71 *sin = -__cosdf(x - s3pio2);
72 *cos = __sindf(x - s3pio2);
74 *sin = __cosdf(x + s3pio2);
75 *cos = __sindf(-s3pio2 - x);
79 *sin = __sindf(hx < 0x80000000 ? x - s4pio2 : x + s4pio2);
80 *cos = __cosdf(hx < 0x80000000 ? x - s4pio2 : x + s4pio2);
84 /* sin(Inf or NaN) is NaN */
85 if (ix >= 0x7f800000) {
90 /* general argument reduction needed */
91 n = __rem_pio2f(x, &y);