1/* s_cosf.c -- float version of s_cos.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_cosf.c,v 1.10 2024/05/08 01:40:27 riastradh Exp $"); 19#endif 20 21#include "namespace.h" 22#include "math.h" 23#include "math_private.h" 24 25__weak_alias(cosf, _cosf) 26 27float 28cosf(float x) 29{ 30 float y[2],z=0.0; 31 int32_t n,ix; 32 33 GET_FLOAT_WORD(ix,x); 34 35 /* |x| ~< pi/4 */ 36 ix &= 0x7fffffff; 37 if(ix <= 0x3f490fd8) return __kernel_cosf(x,z); 38 39 /* cos(Inf or NaN) is NaN */ 40 else if (ix>=0x7f800000) return x-x; 41 42 /* argument reduction needed */ 43 else { 44 n = __ieee754_rem_pio2f(x,y); 45 switch(n&3) { 46 case 0: return __kernel_cosf(y[0],y[1]); 47 case 1: return -__kernel_sinf(y[0],y[1],1); 48 case 2: return -__kernel_cosf(y[0],y[1]); 49 default: 50 return __kernel_sinf(y[0],y[1],1); 51 } 52 } 53} 54