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Side by Side Diff: fusl/src/math/cos.c

Issue 1714623002: [fusl] clang-format fusl (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: headers too Created 4 years, 10 months ago
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1 /* origin: FreeBSD /usr/src/lib/msun/src/s_cos.c */ 1 /* origin: FreeBSD /usr/src/lib/msun/src/s_cos.c */
2 /* 2 /*
3 * ==================================================== 3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 * 5 *
6 * Developed at SunPro, a Sun Microsystems, Inc. business. 6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this 7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice 8 * software is freely granted, provided that this notice
9 * is preserved. 9 * is preserved.
10 * ==================================================== 10 * ====================================================
(...skipping 24 matching lines...) Expand all
35 * Let trig be any of sin, cos, or tan. 35 * Let trig be any of sin, cos, or tan.
36 * trig(+-INF) is NaN, with signals; 36 * trig(+-INF) is NaN, with signals;
37 * trig(NaN) is that NaN; 37 * trig(NaN) is that NaN;
38 * 38 *
39 * Accuracy: 39 * Accuracy:
40 * TRIG(x) returns trig(x) nearly rounded 40 * TRIG(x) returns trig(x) nearly rounded
41 */ 41 */
42 42
43 #include "libm.h" 43 #include "libm.h"
44 44
45 double cos(double x) 45 double cos(double x) {
46 { 46 double y[2];
47 » double y[2]; 47 uint32_t ix;
48 » uint32_t ix; 48 unsigned n;
49 » unsigned n;
50 49
51 » GET_HIGH_WORD(ix, x); 50 GET_HIGH_WORD(ix, x);
52 » ix &= 0x7fffffff; 51 ix &= 0x7fffffff;
53 52
54 » /* |x| ~< pi/4 */ 53 /* |x| ~< pi/4 */
55 » if (ix <= 0x3fe921fb) { 54 if (ix <= 0x3fe921fb) {
56 » » if (ix < 0x3e46a09e) { /* |x| < 2**-27 * sqrt(2) */ 55 if (ix < 0x3e46a09e) { /* |x| < 2**-27 * sqrt(2) */
57 » » » /* raise inexact if x!=0 */ 56 /* raise inexact if x!=0 */
58 » » » FORCE_EVAL(x + 0x1p120f); 57 FORCE_EVAL(x + 0x1p120f);
59 » » » return 1.0; 58 return 1.0;
60 » » } 59 }
61 » » return __cos(x, 0); 60 return __cos(x, 0);
62 » } 61 }
63 62
64 » /* cos(Inf or NaN) is NaN */ 63 /* cos(Inf or NaN) is NaN */
65 » if (ix >= 0x7ff00000) 64 if (ix >= 0x7ff00000)
66 » » return x-x; 65 return x - x;
67 66
68 » /* argument reduction */ 67 /* argument reduction */
69 » n = __rem_pio2(x, y); 68 n = __rem_pio2(x, y);
70 » switch (n&3) { 69 switch (n & 3) {
71 » case 0: return __cos(y[0], y[1]); 70 case 0:
72 » case 1: return -__sin(y[0], y[1], 1); 71 return __cos(y[0], y[1]);
73 » case 2: return -__cos(y[0], y[1]); 72 case 1:
74 » default: 73 return -__sin(y[0], y[1], 1);
75 » » return __sin(y[0], y[1], 1); 74 case 2:
76 » } 75 return -__cos(y[0], y[1]);
76 default:
77 return __sin(y[0], y[1], 1);
78 }
77 } 79 }
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