revert between 56095 -> 55830 in arch
[AROS.git] / compiler / stdc / math / s_sinf.c
blob87d72460ff101a6660868e2fcbf1aadf5c7ff5e1
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.
4 */
6 /*
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
13 * is preserved.
14 * ====================================================
17 #ifndef lint
18 static char rcsid[] = "$FreeBSD: src/lib/msun/src/s_sinf.c,v 1.17 2008/02/25 22:19:17 bde Exp $";
19 #endif
21 #include "math.h"
22 #define INLINE_KERNEL_COSDF
23 #define INLINE_KERNEL_SINDF
24 #define INLINE_REM_PIO2F
25 #include "math_private.h"
26 #include "e_rem_pio2f.c"
27 #include "k_cosf.c"
28 #include "k_sinf.c"
30 /* Small multiples of pi/2 rounded to double precision. */
31 static const double
32 s1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */
33 s2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */
34 s3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */
35 s4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */
37 float
38 sinf(float x)
40 double y;
41 int32_t n, hx, ix;
43 GET_FLOAT_WORD(hx,x);
44 ix = hx & 0x7fffffff;
46 if(ix <= 0x3f490fda) { /* |x| ~<= pi/4 */
47 if(ix<0x39800000) /* |x| < 2**-12 */
48 if(((int)x)==0) return x; /* x with inexact if x != 0 */
49 return __kernel_sindf(x);
51 if(ix<=0x407b53d1) { /* |x| ~<= 5*pi/4 */
52 if(ix<=0x4016cbe3) { /* |x| ~<= 3pi/4 */
53 if(hx>0)
54 return __kernel_cosdf(x - s1pio2);
55 else
56 return -__kernel_cosdf(x + s1pio2);
57 } else
58 return __kernel_sindf((hx > 0 ? s2pio2 : -s2pio2) - x);
60 if(ix<=0x40e231d5) { /* |x| ~<= 9*pi/4 */
61 if(ix<=0x40afeddf) { /* |x| ~<= 7*pi/4 */
62 if(hx>0)
63 return -__kernel_cosdf(x - s3pio2);
64 else
65 return __kernel_cosdf(x + s3pio2);
66 } else
67 return __kernel_sindf(x + (hx > 0 ? -s4pio2 : s4pio2));
70 /* sin(Inf or NaN) is NaN */
71 else if (ix>=0x7f800000) return x-x;
73 /* general argument reduction needed */
74 else {
75 n = __ieee754_rem_pio2f(x,&y);
76 switch(n&3) {
77 case 0: return __kernel_sindf(y);
78 case 1: return __kernel_cosdf(y);
79 case 2: return __kernel_sindf(-y);
80 default:
81 return -__kernel_cosdf(y);