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Side by Side Diff: fusl/src/math/__rem_pio2f.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/e_rem_pio2f.c */ 1 /* origin: FreeBSD /usr/src/lib/msun/src/e_rem_pio2f.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 * Debugged and optimized by Bruce D. Evans. 4 * Debugged and 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 /* __rem_pio2f(x,y) 16 /* __rem_pio2f(x,y)
17 * 17 *
18 * return the remainder of x rem pi/2 in *y 18 * return the remainder of x rem pi/2 in *y
19 * use double precision for everything except passing x 19 * use double precision for everything except passing x
20 * use __rem_pio2_large() for large x 20 * use __rem_pio2_large() for large x
21 */ 21 */
22 22
23 #include "libm.h" 23 #include "libm.h"
24 24
25 #if FLT_EVAL_METHOD==0 || FLT_EVAL_METHOD==1 25 #if FLT_EVAL_METHOD == 0 || FLT_EVAL_METHOD == 1
26 #define EPS DBL_EPSILON 26 #define EPS DBL_EPSILON
27 #elif FLT_EVAL_METHOD==2 27 #elif FLT_EVAL_METHOD == 2
28 #define EPS LDBL_EPSILON 28 #define EPS LDBL_EPSILON
29 #endif 29 #endif
30 30
31 /* 31 /*
32 * invpio2: 53 bits of 2/pi 32 * invpio2: 53 bits of 2/pi
33 * pio2_1: first 25 bits of pi/2 33 * pio2_1: first 25 bits of pi/2
34 * pio2_1t: pi/2 - pio2_1 34 * pio2_1t: pi/2 - pio2_1
35 */ 35 */
36 static const double 36 static const double toint = 1.5 / EPS,
37 toint = 1.5/EPS, 37 invpio2 =
38 invpio2 = 6.36619772367581382433e-01, /* 0x3FE45F30, 0x6DC9C883 */ 38 6.36619772367581382433e-01, /* 0x3FE45F30, 0x6DC9C883 */
39 pio2_1 = 1.57079631090164184570e+00, /* 0x3FF921FB, 0x50000000 */ 39 pio2_1 = 1.57079631090164184570e+00, /* 0x3FF921FB, 0x50000000 */
40 pio2_1t = 1.58932547735281966916e-08; /* 0x3E5110b4, 0x611A6263 */ 40 pio2_1t = 1.58932547735281966916e-08; /* 0x3E5110b4, 0x611A6263 */
41 41
42 int __rem_pio2f(float x, double *y) 42 int __rem_pio2f(float x, double* y) {
43 { 43 union {
44 » union {float f; uint32_t i;} u = {x}; 44 float f;
45 » double tx[1],ty[1]; 45 uint32_t i;
46 » double_t fn; 46 } u = {x};
47 » uint32_t ix; 47 double tx[1], ty[1];
48 » int n, sign, e0; 48 double_t fn;
49 uint32_t ix;
50 int n, sign, e0;
49 51
50 » ix = u.i & 0x7fffffff; 52 ix = u.i & 0x7fffffff;
51 » /* 25+53 bit pi is good enough for medium size */ 53 /* 25+53 bit pi is good enough for medium size */
52 » if (ix < 0x4dc90fdb) { /* |x| ~< 2^28*(pi/2), medium size */ 54 if (ix < 0x4dc90fdb) { /* |x| ~< 2^28*(pi/2), medium size */
53 » » /* Use a specialized rint() to get fn. Assume round-to-nearest. */ 55 /* Use a specialized rint() to get fn. Assume round-to-nearest. */
54 » » fn = (double_t)x*invpio2 + toint - toint; 56 fn = (double_t)x * invpio2 + toint - toint;
55 » » n = (int32_t)fn; 57 n = (int32_t)fn;
56 » » *y = x - fn*pio2_1 - fn*pio2_1t; 58 *y = x - fn * pio2_1 - fn * pio2_1t;
57 » » return n; 59 return n;
58 » } 60 }
59 » if(ix>=0x7f800000) { /* x is inf or NaN */ 61 if (ix >= 0x7f800000) { /* x is inf or NaN */
60 » » *y = x-x; 62 *y = x - x;
61 » » return 0; 63 return 0;
62 » } 64 }
63 » /* scale x into [2^23, 2^24-1] */ 65 /* scale x into [2^23, 2^24-1] */
64 » sign = u.i>>31; 66 sign = u.i >> 31;
65 » e0 = (ix>>23) - (0x7f+23); /* e0 = ilogb(|x|)-23, positive */ 67 e0 = (ix >> 23) - (0x7f + 23); /* e0 = ilogb(|x|)-23, positive */
66 » u.i = ix - (e0<<23); 68 u.i = ix - (e0 << 23);
67 » tx[0] = u.f; 69 tx[0] = u.f;
68 » n = __rem_pio2_large(tx,ty,e0,1,0); 70 n = __rem_pio2_large(tx, ty, e0, 1, 0);
69 » if (sign) { 71 if (sign) {
70 » » *y = -ty[0]; 72 *y = -ty[0];
71 » » return -n; 73 return -n;
72 » } 74 }
73 » *y = ty[0]; 75 *y = ty[0];
74 » return n; 76 return n;
75 } 77 }
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