1 /* $NetBSD: s_sinl.c,v 1.2 2024/01/26 12:32:49 ryoon Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause 5 * 6 * Copyright (c) 2007 Steven G. Kargl 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice unmodified, this list of conditions, and the following 14 * disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __RCSID("$NetBSD: s_sinl.c,v 1.2 2024/01/26 12:32:49 ryoon Exp $"); 33 34 #include "namespace.h" 35 #include <float.h> 36 #ifdef __i386__ 37 #include <ieeefp.h> 38 #endif 39 40 #ifdef __weak_alias 41 __weak_alias(sinl, _sinl) 42 #endif 43 44 #include "math.h" 45 #include "math_private.h" 46 47 #ifdef __HAVE_LONG_DOUBLE 48 49 #if LDBL_MANT_DIG == 64 50 #include "../ld80/e_rem_pio2l.h" 51 #include "../ld80/k_sinl.c" 52 #elif LDBL_MANT_DIG == 113 53 #include "../ld128/e_rem_pio2l.h" 54 #include "../ld128/k_sinl.c" 55 #else 56 #error "Unsupported long double format" 57 #endif 58 59 long double 60 sinl(long double x) 61 { 62 union ieee_ext_u z; 63 int e0, s; 64 long double y[2]; 65 long double hi, lo; 66 67 z.extu_ld = x; 68 s = z.extu_sign; 69 z.extu_sign = 0; 70 71 /* If x = +-0 or x is a subnormal number, then sin(x) = x */ 72 if (z.extu_exp == 0) 73 return (x); 74 75 /* If x = NaN or Inf, then sin(x) = NaN. */ 76 if (z.extu_exp == 32767) 77 return ((x - x) / (x - x)); 78 79 ENTERI(); 80 81 /* Optimize the case where x is already within range. */ 82 if (z.extu_ld < M_PI_4) { 83 hi = __kernel_sinl(z.extu_ld, 0, 0); 84 RETURNI(s ? -hi : hi); 85 } 86 87 e0 = __ieee754_rem_pio2l(x, y); 88 hi = y[0]; 89 lo = y[1]; 90 91 switch (e0 & 3) { 92 case 0: 93 hi = __kernel_sinl(hi, lo, 1); 94 break; 95 case 1: 96 hi = __kernel_cosl(hi, lo); 97 break; 98 case 2: 99 hi = - __kernel_sinl(hi, lo, 1); 100 break; 101 case 3: 102 hi = - __kernel_cosl(hi, lo); 103 break; 104 } 105 106 RETURNI(hi); 107 } 108 109 #else 110 111 long double 112 sinl(long double x) 113 { 114 return sin(x); 115 } 116 117 #endif /* __HAVE_LONG_DOUBLE */ 118