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Side by Side Diff: fusl/src/math/tanf.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_tanf.c */ 1 /* origin: FreeBSD /usr/src/lib/msun/src/s_tanf.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 t1pio2 = 1 * M_PI_2, /* 0x3FF921FB, 0x54442D18 */
21 t1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */ 21 t2pio2 = 2 * M_PI_2, /* 0x400921FB, 0x54442D18 */
22 t2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */ 22 t3pio2 = 3 * M_PI_2, /* 0x4012D97C, 0x7F3321D2 */
23 t3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */ 23 t4pio2 = 4 * M_PI_2; /* 0x401921FB, 0x54442D18 */
24 t4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */
25 24
26 float tanf(float x) 25 float tanf(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 and underflow if subnormal */ 36 /* raise inexact if x!=0 and underflow if subnormal */
39 » » » FORCE_EVAL(ix < 0x00800000 ? x/0x1p120f : x+0x1p120f); 37 FORCE_EVAL(ix < 0x00800000 ? x / 0x1p120f : x + 0x1p120f);
40 » » » return x; 38 return x;
41 » » } 39 }
42 » » return __tandf(x, 0); 40 return __tandf(x, 0);
43 » } 41 }
44 » if (ix <= 0x407b53d1) { /* |x| ~<= 5*pi/4 */ 42 if (ix <= 0x407b53d1) { /* |x| ~<= 5*pi/4 */
45 » » if (ix <= 0x4016cbe3) /* |x| ~<= 3pi/4 */ 43 if (ix <= 0x4016cbe3) /* |x| ~<= 3pi/4 */
46 » » » return __tandf((sign ? x+t1pio2 : x-t1pio2), 1); 44 return __tandf((sign ? x + t1pio2 : x - t1pio2), 1);
47 » » else 45 else
48 » » » return __tandf((sign ? x+t2pio2 : x-t2pio2), 0); 46 return __tandf((sign ? x + t2pio2 : x - t2pio2), 0);
49 » } 47 }
50 » if (ix <= 0x40e231d5) { /* |x| ~<= 9*pi/4 */ 48 if (ix <= 0x40e231d5) { /* |x| ~<= 9*pi/4 */
51 » » if (ix <= 0x40afeddf) /* |x| ~<= 7*pi/4 */ 49 if (ix <= 0x40afeddf) /* |x| ~<= 7*pi/4 */
52 » » » return __tandf((sign ? x+t3pio2 : x-t3pio2), 1); 50 return __tandf((sign ? x + t3pio2 : x - t3pio2), 1);
53 » » else 51 else
54 » » » return __tandf((sign ? x+t4pio2 : x-t4pio2), 0); 52 return __tandf((sign ? x + t4pio2 : x - t4pio2), 0);
55 » } 53 }
56 54
57 » /* tan(Inf or NaN) is NaN */ 55 /* tan(Inf or NaN) is NaN */
58 » if (ix >= 0x7f800000) 56 if (ix >= 0x7f800000)
59 » » return x - x; 57 return x - x;
60 58
61 » /* argument reduction */ 59 /* argument reduction */
62 » n = __rem_pio2f(x, &y); 60 n = __rem_pio2f(x, &y);
63 » return __tandf(y, n&1); 61 return __tandf(y, n & 1);
64 } 62 }
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