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s_cos.c (117912) s_cos.c (151620)
1/* @(#)s_cos.c 5.1 93/09/24 */
2/*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 *
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice
9 * is preserved.
10 * ====================================================
11 */
12
13#ifndef lint
1/* @(#)s_cos.c 5.1 93/09/24 */
2/*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 *
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice
9 * is preserved.
10 * ====================================================
11 */
12
13#ifndef lint
14static char rcsid[] = "$FreeBSD: head/lib/msun/src/s_cos.c 117912 2003-07-23 04:53:47Z peter $";
14static char rcsid[] = "$FreeBSD: head/lib/msun/src/s_cos.c 151620 2005-10-24 14:08:36Z bde $";
15#endif
16
17/* cos(x)
18 * Return cosine function of x.
19 *
20 * kernel function:
21 * __kernel_sin ... sine function on [-pi/4,pi/4]
22 * __kernel_cos ... cosine function on [-pi/4,pi/4]

--- 31 unchanged lines hidden (view full) ---

54 double y[2],z=0.0;
55 int32_t n, ix;
56
57 /* High word of x. */
58 GET_HIGH_WORD(ix,x);
59
60 /* |x| ~< pi/4 */
61 ix &= 0x7fffffff;
15#endif
16
17/* cos(x)
18 * Return cosine function of x.
19 *
20 * kernel function:
21 * __kernel_sin ... sine function on [-pi/4,pi/4]
22 * __kernel_cos ... cosine function on [-pi/4,pi/4]

--- 31 unchanged lines hidden (view full) ---

54 double y[2],z=0.0;
55 int32_t n, ix;
56
57 /* High word of x. */
58 GET_HIGH_WORD(ix,x);
59
60 /* |x| ~< pi/4 */
61 ix &= 0x7fffffff;
62 if(ix <= 0x3fe921fb) return __kernel_cos(x,z);
62 if(ix <= 0x3fe921fb) {
63 if(ix<0x3e400000) /* if x < 2**-27 */
64 if(((int)x)==0) return 1.0; /* generate inexact */
65 return __kernel_cos(x,z);
66 }
63
64 /* cos(Inf or NaN) is NaN */
65 else if (ix>=0x7ff00000) return x-x;
66
67 /* argument reduction needed */
68 else {
69 n = __ieee754_rem_pio2(x,y);
70 switch(n&3) {
71 case 0: return __kernel_cos(y[0],y[1]);
72 case 1: return -__kernel_sin(y[0],y[1],1);
73 case 2: return -__kernel_cos(y[0],y[1]);
74 default:
75 return __kernel_sin(y[0],y[1],1);
76 }
77 }
78}
67
68 /* cos(Inf or NaN) is NaN */
69 else if (ix>=0x7ff00000) return x-x;
70
71 /* argument reduction needed */
72 else {
73 n = __ieee754_rem_pio2(x,y);
74 switch(n&3) {
75 case 0: return __kernel_cos(y[0],y[1]);
76 case 1: return -__kernel_sin(y[0],y[1],1);
77 case 2: return -__kernel_cos(y[0],y[1]);
78 default:
79 return __kernel_sin(y[0],y[1],1);
80 }
81 }
82}