1 /*-
2 * ====================================================
3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
4 * Copyright (c) 2008 Steven G. Kargl, David Schultz, Bruce D. Evans.
5 *
6 * Developed at SunSoft, 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 * k_sinl.c and k_cosl.c merged by Steven G. Kargl
13 */
14
15 #include <sys/cdefs.h>
16 __FBSDID("$FreeBSD$");
17
18 #if LDBL_MANT_DIG == 64 /* ld80 version of k_sincosl.c. */
19
20 #if defined(__amd64__) || defined(__i386__)
21 /* Long double constants are slow on these arches, and broken on i386. */
22 static const volatile double
23 C1hi = 0.041666666666666664, /* 0x15555555555555.0p-57 */
24 C1lo = 2.2598839032744733e-18, /* 0x14d80000000000.0p-111 */
25 S1hi = -0.16666666666666666, /* -0x15555555555555.0p-55 */
26 S1lo = -9.2563760475949941e-18; /* -0x15580000000000.0p-109 */
27 #define S1 ((long double)S1hi + S1lo)
28 #define C1 ((long double)C1hi + C1lo)
29 #else
30 static const long double
31 C1 = 0.0416666666666666666136L, /* 0xaaaaaaaaaaaaaa9b.0p-68 */
32 S1 = -0.166666666666666666671L; /* -0xaaaaaaaaaaaaaaab.0p-66 */
33 #endif
34
35 static const double
36 C2 = -0.0013888888888888874, /* -0x16c16c16c16c10.0p-62 */
37 C3 = 0.000024801587301571716, /* 0x1a01a01a018e22.0p-68 */
38 C4 = -0.00000027557319215507120, /* -0x127e4fb7602f22.0p-74 */
39 C5 = 0.0000000020876754400407278, /* 0x11eed8caaeccf1.0p-81 */
40 C6 = -1.1470297442401303e-11, /* -0x19393412bd1529.0p-89 */
41 C7 = 4.7383039476436467e-14, /* 0x1aac9d9af5c43e.0p-97 */
42 S2 = 0.0083333333333333332, /* 0x11111111111111.0p-59 */
43 S3 = -0.00019841269841269427, /* -0x1a01a01a019f81.0p-65 */
44 S4 = 0.0000027557319223597490, /* 0x171de3a55560f7.0p-71 */
45 S5 = -0.000000025052108218074604, /* -0x1ae64564f16cad.0p-78 */
46 S6 = 1.6059006598854211e-10, /* 0x161242b90243b5.0p-85 */
47 S7 = -7.6429779983024564e-13, /* -0x1ae42ebd1b2e00.0p-93 */
48 S8 = 2.6174587166648325e-15; /* 0x179372ea0b3f64.0p-101 */
49
50 static inline void
__kernel_sincosl(long double x,long double y,int iy,long double * sn,long double * cs)51 __kernel_sincosl(long double x, long double y, int iy, long double *sn,
52 long double *cs)
53 {
54 long double hz, r, v, w, z;
55
56 z = x * x;
57 v = z * x;
58 /*
59 * XXX Replace Horner scheme with an algorithm suitable for CPUs
60 * with more complex pipelines.
61 */
62 r = S2 + z * (S3 + z * (S4 + z * (S5 + z * (S6 + z * (S7 + z * S8)))));
63
64 if (iy == 0)
65 *sn = x + v * (S1 + z * r);
66 else
67 *sn = x - ((z * (y / 2 - v * r) - y) - v * S1);
68
69 hz = z / 2;
70 w = 1 - hz;
71 r = z * (C1 + z * (C2 + z * (C3 + z * (C4 + z * (C5 + z * (C6 +
72 z * C7))))));
73 *cs = w + (((1 - w) - hz) + (z * r - x * y));
74 }
75
76 #elif LDBL_MANT_DIG == 113 /* ld128 version of k_sincosl.c. */
77
78 static const long double
79 S1 = -0.16666666666666666666666666666666666606732416116558L,
80 S2 = 0.0083333333333333333333333333333331135404851288270047L,
81 S3 = -0.00019841269841269841269841269839935785325638310428717L,
82 S4 = 0.27557319223985890652557316053039946268333231205686e-5L,
83 S5 = -0.25052108385441718775048214826384312253862930064745e-7L,
84 S6 = 0.16059043836821614596571832194524392581082444805729e-9L,
85 S7 = -0.76471637318198151807063387954939213287488216303768e-12L,
86 S8 = 0.28114572543451292625024967174638477283187397621303e-14L;
87
88 static const double
89 S9 = -0.82206352458348947812512122163446202498005154296863e-17,
90 S10 = 0.19572940011906109418080609928334380560135358385256e-19,
91 S11 = -0.38680813379701966970673724299207480965452616911420e-22,
92 S12 = 0.64038150078671872796678569586315881020659912139412e-25;
93
94 static const long double
95 C1 = 4.16666666666666666666666666666666667e-02L,
96 C2 = -1.38888888888888888888888888888888834e-03L,
97 C3 = 2.48015873015873015873015873015446795e-05L,
98 C4 = -2.75573192239858906525573190949988493e-07L,
99 C5 = 2.08767569878680989792098886701451072e-09L,
100 C6 = -1.14707455977297247136657111139971865e-11L,
101 C7 = 4.77947733238738518870113294139830239e-14L,
102 C8 = -1.56192069685858079920640872925306403e-16L,
103 C9 = 4.11031762320473354032038893429515732e-19L,
104 C10= -8.89679121027589608738005163931958096e-22L,
105 C11= 1.61171797801314301767074036661901531e-24L,
106 C12= -2.46748624357670948912574279501044295e-27L;
107
108 static inline void
__kernel_sincosl(long double x,long double y,int iy,long double * sn,long double * cs)109 __kernel_sincosl(long double x, long double y, int iy, long double *sn,
110 long double *cs)
111 {
112 long double hz, r, v, w, z;
113
114 z = x * x;
115 v = z * x;
116 /*
117 * XXX Replace Horner scheme with an algorithm suitable for CPUs
118 * with more complex pipelines.
119 */
120 r = S2 + z * (S3 + z * (S4 + z * (S5 + z * (S6 + z * (S7 + z * (S8 +
121 z * (S9 + z * (S10 + z * (S11 + z * S12)))))))));
122
123 if (iy == 0)
124 *sn = x + v * (S1 + z * r);
125 else
126 *sn = x - ((z * (y / 2 - v * r) - y) - v * S1);
127
128 hz = z / 2;
129 w = 1 - hz;
130 r = z * (C1 + z * (C2 + z * (C3 + z * (C4 + z * (C5 + z * (C6 +
131 z * (C7 + z * (C8 + z * (C9 + z * (C10 + z * (C11+z*C12)))))))))));
132
133 *cs = w + (((1 - w) - hz) + (z * r - x * y));
134 }
135 #else
136 #error "Unsupported long double format"
137 #endif
138