12116Sjkh/* s_cosf.c -- float version of s_cos.c. 22116Sjkh * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 3152871Sbde * Optimized by Bruce D. Evans. 42116Sjkh */ 52116Sjkh 62116Sjkh/* 72116Sjkh * ==================================================== 82116Sjkh * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 92116Sjkh * 102116Sjkh * Developed at SunPro, a Sun Microsystems, Inc. business. 112116Sjkh * Permission to use, copy, modify, and distribute this 128870Srgrimes * software is freely granted, provided that this notice 132116Sjkh * is preserved. 142116Sjkh * ==================================================== 152116Sjkh */ 162116Sjkh 17176451Sdas#include <sys/cdefs.h> 18176451Sdas__FBSDID("$FreeBSD$"); 192116Sjkh 20176569Sbde#include <float.h> 21176569Sbde 222116Sjkh#include "math.h" 23152869Sbde#define INLINE_KERNEL_COSDF 24152869Sbde#define INLINE_KERNEL_SINDF 25176569Sbde#define INLINE_REM_PIO2F 262116Sjkh#include "math_private.h" 27176569Sbde#include "e_rem_pio2f.c" 28152647Sbde#include "k_cosf.c" 29152647Sbde#include "k_sinf.c" 302116Sjkh 31152596Sbde/* Small multiples of pi/2 rounded to double precision. */ 32152596Sbdestatic const double 33152596Sbdec1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */ 34152596Sbdec2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */ 35152596Sbdec3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */ 36152596Sbdec4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */ 37152596Sbde 3897413Salfredfloat 3997413Salfredcosf(float x) 402116Sjkh{ 41176552Sbde double y; 42152949Sbde int32_t n, hx, ix; 432116Sjkh 44152949Sbde GET_FLOAT_WORD(hx,x); 45152949Sbde ix = hx & 0x7fffffff; 462116Sjkh 47152540Sbde if(ix <= 0x3f490fda) { /* |x| ~<= pi/4 */ 48152540Sbde if(ix<0x39800000) /* |x| < 2**-12 */ 49152540Sbde if(((int)x)==0) return 1.0; /* 1 with inexact if x != 0 */ 50152869Sbde return __kernel_cosdf(x); 51151620Sbde } 52152871Sbde if(ix<=0x407b53d1) { /* |x| ~<= 5*pi/4 */ 53152949Sbde if(ix>0x4016cbe3) /* |x| ~> 3*pi/4 */ 54152949Sbde return -__kernel_cosdf(x + (hx > 0 ? -c2pio2 : c2pio2)); 55152949Sbde else { 56152949Sbde if(hx>0) 57152949Sbde return __kernel_sindf(c1pio2 - x); 58152949Sbde else 59152949Sbde return __kernel_sindf(x + c1pio2); 60152949Sbde } 61152596Sbde } 62152871Sbde if(ix<=0x40e231d5) { /* |x| ~<= 9*pi/4 */ 63152949Sbde if(ix>0x40afeddf) /* |x| ~> 7*pi/4 */ 64152949Sbde return __kernel_cosdf(x + (hx > 0 ? -c4pio2 : c4pio2)); 65152949Sbde else { 66152949Sbde if(hx>0) 67152949Sbde return __kernel_sindf(x - c3pio2); 68152949Sbde else 69152949Sbde return __kernel_sindf(-c3pio2 - x); 70152949Sbde } 71152596Sbde } 722116Sjkh 732116Sjkh /* cos(Inf or NaN) is NaN */ 742116Sjkh else if (ix>=0x7f800000) return x-x; 752116Sjkh 76152596Sbde /* general argument reduction needed */ 772116Sjkh else { 78176552Sbde n = __ieee754_rem_pio2f(x,&y); 792116Sjkh switch(n&3) { 80176552Sbde case 0: return __kernel_cosdf(y); 81176552Sbde case 1: return __kernel_sindf(-y); 82176552Sbde case 2: return -__kernel_cosdf(y); 832116Sjkh default: 84176552Sbde return __kernel_sindf(y); 852116Sjkh } 862116Sjkh } 872116Sjkh} 88