1 /* s_sinf.c -- float version of s_sin.c. 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 3 */ 4 5 /* 6 * ==================================================== 7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 8 * 9 * Developed at SunPro, a Sun Microsystems, Inc. business. 10 * Permission to use, copy, modify, and distribute this 11 * software is freely granted, provided that this notice 12 * is preserved. 13 * ==================================================== 14 */ 15 16 #include <sys/cdefs.h> 17 #if defined(LIBM_SCCS) && !defined(lint) 18 __RCSID("$NetBSD: s_sinf.c,v 1.8 2007/08/20 16:01:39 drochner Exp $"); 19 #endif 20 21 #include "namespace.h" 22 #include "math.h" 23 #include "math_private.h" 24 25 #if 0 /* notyet */ 26 #ifdef __weak_alias 27 __weak_alias(sinf, _sinf) 28 #endif 29 #endif 30 31 float 32 sinf(float x) 33 { 34 float y[2],z=0.0; 35 int32_t n, ix; 36 37 GET_FLOAT_WORD(ix,x); 38 39 /* |x| ~< pi/4 */ 40 ix &= 0x7fffffff; 41 if(ix <= 0x3f490fd8) return __kernel_sinf(x,z,0); 42 43 /* sin(Inf or NaN) is NaN */ 44 else if (ix>=0x7f800000) return x-x; 45 46 /* argument reduction needed */ 47 else { 48 n = __ieee754_rem_pio2f(x,y); 49 switch(n&3) { 50 case 0: return __kernel_sinf(y[0],y[1],1); 51 case 1: return __kernel_cosf(y[0],y[1]); 52 case 2: return -__kernel_sinf(y[0],y[1],1); 53 default: 54 return -__kernel_cosf(y[0],y[1]); 55 } 56 } 57 } 58