1 /* s_sinf.c -- float version of s_sin.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 * 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 * ====================================================
15 * FreeBSD SVN: 176569 (2008-02-25)
19 #define INLINE_KERNEL_COSDF
20 #define INLINE_KERNEL_SINDF
21 #define INLINE_REM_PIO2F
22 #include "math_private.h"
23 #include "e_rem_pio2f.c"
27 /* Small multiples of pi/2 rounded to double precision. */
29 s1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */
30 s2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */
31 s3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */
32 s4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */
43 if(ix <= 0x3f490fda) { /* |x| ~<= pi/4 */
44 if(ix<0x39800000) /* |x| < 2**-12 */
45 if(((int)x)==0) return x; /* x with inexact if x != 0 */
46 return __kernel_sindf(x);
48 if(ix<=0x407b53d1) { /* |x| ~<= 5*pi/4 */
49 if(ix<=0x4016cbe3) { /* |x| ~<= 3pi/4 */
51 return __kernel_cosdf(x - s1pio2);
53 return -__kernel_cosdf(x + s1pio2);
55 return __kernel_sindf((hx > 0 ? s2pio2 : -s2pio2) - x);
57 if(ix<=0x40e231d5) { /* |x| ~<= 9*pi/4 */
58 if(ix<=0x40afeddf) { /* |x| ~<= 7*pi/4 */
60 return -__kernel_cosdf(x - s3pio2);
62 return __kernel_cosdf(x + s3pio2);
64 return __kernel_sindf(x + (hx > 0 ? -s4pio2 : s4pio2));
67 /* sin(Inf or NaN) is NaN */
68 else if (ix>=0x7f800000) return x-x;
70 /* general argument reduction needed */
72 n = __libm_rem_pio2f(x,&y);
74 case 0: return __kernel_sindf(y);
75 case 1: return __kernel_cosdf(y);
76 case 2: return __kernel_sindf(-y);
78 return -__kernel_cosdf(y);