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Side by Side Diff: fusl/src/math/cosf.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_cosf.c */ 1 /* origin: FreeBSD /usr/src/lib/msun/src/s_cosf.c */
2 /* 2 /*
3 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 3 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
4 * Optimized by Bruce D. Evans. 4 * Optimized by Bruce D. Evans.
5 */ 5 */
6 /* 6 /*
7 * ==================================================== 7 * ====================================================
8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 * 9 *
10 * Developed at SunPro, a Sun Microsystems, Inc. business. 10 * Developed at SunPro, a Sun Microsystems, Inc. business.
11 * Permission to use, copy, modify, and distribute this 11 * Permission to use, copy, modify, and distribute this
12 * software is freely granted, provided that this notice 12 * software is freely granted, provided that this notice
13 * is preserved. 13 * is preserved.
14 * ==================================================== 14 * ====================================================
15 */ 15 */
16 16
17 #include "libm.h" 17 #include "libm.h"
18 18
19 /* Small multiples of pi/2 rounded to double precision. */ 19 /* Small multiples of pi/2 rounded to double precision. */
20 static const double 20 static const double c1pio2 = 1 * M_PI_2, /* 0x3FF921FB, 0x54442D18 */
21 c1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */ 21 c2pio2 = 2 * M_PI_2, /* 0x400921FB, 0x54442D18 */
22 c2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */ 22 c3pio2 = 3 * M_PI_2, /* 0x4012D97C, 0x7F3321D2 */
23 c3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */ 23 c4pio2 = 4 * M_PI_2; /* 0x401921FB, 0x54442D18 */
24 c4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */
25 24
26 float cosf(float x) 25 float cosf(float x) {
27 { 26 double y;
28 » double y; 27 uint32_t ix;
29 » uint32_t ix; 28 unsigned n, sign;
30 » unsigned n, sign;
31 29
32 » GET_FLOAT_WORD(ix, x); 30 GET_FLOAT_WORD(ix, x);
33 » sign = ix >> 31; 31 sign = ix >> 31;
34 » ix &= 0x7fffffff; 32 ix &= 0x7fffffff;
35 33
36 » if (ix <= 0x3f490fda) { /* |x| ~<= pi/4 */ 34 if (ix <= 0x3f490fda) { /* |x| ~<= pi/4 */
37 » » if (ix < 0x39800000) { /* |x| < 2**-12 */ 35 if (ix < 0x39800000) { /* |x| < 2**-12 */
38 » » » /* raise inexact if x != 0 */ 36 /* raise inexact if x != 0 */
39 » » » FORCE_EVAL(x + 0x1p120f); 37 FORCE_EVAL(x + 0x1p120f);
40 » » » return 1.0f; 38 return 1.0f;
41 » » } 39 }
42 » » return __cosdf(x); 40 return __cosdf(x);
43 » } 41 }
44 » if (ix <= 0x407b53d1) { /* |x| ~<= 5*pi/4 */ 42 if (ix <= 0x407b53d1) { /* |x| ~<= 5*pi/4 */
45 » » if (ix > 0x4016cbe3) /* |x| ~> 3*pi/4 */ 43 if (ix > 0x4016cbe3) /* |x| ~> 3*pi/4 */
46 » » » return -__cosdf(sign ? x+c2pio2 : x-c2pio2); 44 return -__cosdf(sign ? x + c2pio2 : x - c2pio2);
47 » » else { 45 else {
48 » » » if (sign) 46 if (sign)
49 » » » » return __sindf(x + c1pio2); 47 return __sindf(x + c1pio2);
50 » » » else 48 else
51 » » » » return __sindf(c1pio2 - x); 49 return __sindf(c1pio2 - x);
52 » » } 50 }
53 » } 51 }
54 » if (ix <= 0x40e231d5) { /* |x| ~<= 9*pi/4 */ 52 if (ix <= 0x40e231d5) { /* |x| ~<= 9*pi/4 */
55 » » if (ix > 0x40afeddf) /* |x| ~> 7*pi/4 */ 53 if (ix > 0x40afeddf) /* |x| ~> 7*pi/4 */
56 » » » return __cosdf(sign ? x+c4pio2 : x-c4pio2); 54 return __cosdf(sign ? x + c4pio2 : x - c4pio2);
57 » » else { 55 else {
58 » » » if (sign) 56 if (sign)
59 » » » » return __sindf(-x - c3pio2); 57 return __sindf(-x - c3pio2);
60 » » » else 58 else
61 » » » » return __sindf(x - c3pio2); 59 return __sindf(x - c3pio2);
62 » » } 60 }
63 » } 61 }
64 62
65 » /* cos(Inf or NaN) is NaN */ 63 /* cos(Inf or NaN) is NaN */
66 » if (ix >= 0x7f800000) 64 if (ix >= 0x7f800000)
67 » » return x-x; 65 return x - x;
68 66
69 » /* general argument reduction needed */ 67 /* general argument reduction needed */
70 » n = __rem_pio2f(x,&y); 68 n = __rem_pio2f(x, &y);
71 » switch (n&3) { 69 switch (n & 3) {
72 » case 0: return __cosdf(y); 70 case 0:
73 » case 1: return __sindf(-y); 71 return __cosdf(y);
74 » case 2: return -__cosdf(y); 72 case 1:
75 » default: 73 return __sindf(-y);
76 » » return __sindf(y); 74 case 2:
77 » } 75 return -__cosdf(y);
76 default:
77 return __sindf(y);
78 }
78 } 79 }
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