1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23 */ 24 /* 25 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 #pragma weak cosf = __cosf 30 31 /* 32 * See sincosf.c 33 */ 34 35 #include "libm.h" 36 37 extern const int _TBL_ipio2_inf[]; 38 extern int __rem_pio2m(double *, double *, int, int, int, const int *); 39 #if defined(__i386) && !defined(__amd64) 40 extern int __swapRP(int); 41 #endif 42 43 static const double C[] = { 44 1.85735322054308378716204874632872525989806770558e-0003, 45 -1.95035094218403635082921458859320791358115801259e-0004, 46 5.38400550766074785970952495168558701485841707252e+0002, 47 -3.31975110777873728964197739157371509422022905947e+0001, 48 1.09349482127188401868272000389539985058873853699e-0003, 49 -5.03324285989964979398034700054920226866107675091e-0004, 50 2.43792880266971107750418061559602239831538067410e-0005, 51 9.14499072605666582228127405245558035523741471271e+0002, 52 -3.63151270591815439197122504991683846785293207730e+0001, 53 0.636619772367581343075535, /* 2^ -1 * 1.45F306DC9C883 */ 54 0.5, 55 1.570796326734125614166, /* 2^ 0 * 1.921FB54400000 */ 56 6.077100506506192601475e-11, /* 2^-34 * 1.0B4611A626331 */ 57 }; 58 59 #define S0 C[0] 60 #define S1 C[1] 61 #define S2 C[2] 62 #define S3 C[3] 63 #define C0 C[4] 64 #define C1 C[5] 65 #define C2 C[6] 66 #define C3 C[7] 67 #define C4 C[8] 68 #define invpio2 C[9] 69 #define half C[10] 70 #define pio2_1 C[11] 71 #define pio2_t C[12] 72 73 float 74 cosf(float x) 75 { 76 double y, z, w; 77 float f; 78 int n, ix, hx, hy; 79 volatile int i; 80 81 hx = *((int *)&x); 82 ix = hx & 0x7fffffff; 83 84 y = (double)x; 85 86 if (ix <= 0x4016cbe4) { /* |x| < 3*pi/4 */ 87 if (ix <= 0x3f490fdb) { /* |x| < pi/4 */ 88 if (ix <= 0x39800000) { /* |x| <= 2**-12 */ 89 i = (int)y; 90 #ifdef lint 91 i = i; 92 #endif 93 return (1.0f); 94 } 95 z = y * y; 96 return ((float)(((C0 + z * C1) + (z * z) * C2) * 97 (C3 + z * (C4 + z)))); 98 } else if (hx > 0) { 99 y = (y - pio2_1) - pio2_t; 100 z = y * y; 101 return ((float)-((y * (S0 + z * S1)) * 102 (S2 + z * (S3 + z)))); 103 } else { 104 y = (y + pio2_1) + pio2_t; 105 z = y * y; 106 return ((float)((y * (S0 + z * S1)) * 107 (S2 + z * (S3 + z)))); 108 } 109 } else if (ix <= 0x49c90fdb) { /* |x| < 2^19*pi */ 110 #if defined(__i386) && !defined(__amd64) 111 int rp; 112 113 rp = __swapRP(fp_extended); 114 #endif 115 w = y * invpio2; 116 if (hx < 0) 117 n = (int)(w - half); 118 else 119 n = (int)(w + half); 120 y = (y - n * pio2_1) - n * pio2_t; 121 n++; 122 #if defined(__i386) && !defined(__amd64) 123 if (rp != fp_extended) 124 (void) __swapRP(rp); 125 #endif 126 } else { 127 if (ix >= 0x7f800000) 128 return (x / x); /* cos(Inf or NaN) is NaN */ 129 hy = ((int *)&y)[HIWORD]; 130 n = ((hy >> 20) & 0x7ff) - 1046; 131 ((int *)&w)[HIWORD] = (hy & 0xfffff) | 0x41600000; 132 ((int *)&w)[LOWORD] = ((int *)&y)[LOWORD]; 133 n = __rem_pio2m(&w, &y, n, 1, 0, _TBL_ipio2_inf) + 1; 134 } 135 136 if (n & 1) { 137 /* compute cos y */ 138 z = y * y; 139 f = (float)(((C0 + z * C1) + (z * z) * C2) * 140 (C3 + z * (C4 + z))); 141 } else { 142 /* compute sin y */ 143 z = y * y; 144 f = (float)((y * (S0 + z * S1)) * (S2 + z * (S3 + z))); 145 } 146 147 return ((n & 2)? -f : f); 148 } 149