s_sinf.c revision 152647
12116Sjkh/* s_sinf.c -- float version of s_sin.c. 22116Sjkh * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 32116Sjkh */ 42116Sjkh 52116Sjkh/* 62116Sjkh * ==================================================== 72116Sjkh * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 82116Sjkh * 92116Sjkh * Developed at SunPro, a Sun Microsystems, Inc. business. 102116Sjkh * Permission to use, copy, modify, and distribute this 118870Srgrimes * software is freely granted, provided that this notice 122116Sjkh * is preserved. 132116Sjkh * ==================================================== 142116Sjkh */ 152116Sjkh 162116Sjkh#ifndef lint 1750476Speterstatic char rcsid[] = "$FreeBSD: head/lib/msun/src/s_sinf.c 152647 2005-11-21 04:57:12Z bde $"; 182116Sjkh#endif 192116Sjkh 202116Sjkh#include "math.h" 21152647Sbde#define INLINE_KERNEL_COSF 22152647Sbde#define INLINE_KERNEL_SINF 232116Sjkh#include "math_private.h" 24152647Sbde#include "k_cosf.c" 25152647Sbde#include "k_sinf.c" 262116Sjkh 27152596Sbde/* Small multiples of pi/2 rounded to double precision. */ 28152596Sbdestatic const double 29152596Sbdes1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */ 30152596Sbdes2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */ 31152596Sbdes3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */ 32152596Sbdes4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */ 33152596Sbde 34152596Sbdestatic inline float 35152596Sbde__kernel_cosdf(double x) 36152596Sbde{ 37152596Sbde return __kernel_cosf((float)x, x - (float)x); 38152596Sbde} 39152596Sbde 40152596Sbdestatic inline float 41152596Sbde__kernel_sindf(double x) 42152596Sbde{ 43152596Sbde return __kernel_sinf((float)x, x - (float)x, 1); 44152596Sbde} 45152596Sbde 4697413Salfredfloat 4797413Salfredsinf(float x) 482116Sjkh{ 49152540Sbde float y[2]; 50152596Sbde int32_t n, hx, ix; 512116Sjkh 52152596Sbde GET_FLOAT_WORD(hx,x); 53152596Sbde ix = hx & 0x7fffffff; 542116Sjkh 55152540Sbde if(ix <= 0x3f490fda) { /* |x| ~<= pi/4 */ 56152540Sbde if(ix<0x39800000) /* |x| < 2**-12 */ 57152540Sbde if(((int)x)==0) return x; /* x with inexact if x != 0 */ 58152540Sbde return __kernel_sinf(x,0.0,0); 59151620Sbde } 60152596Sbde if(ix<=0x407b53d1) { /* |x| <= ~5*pi/4 */ 61152596Sbde if(ix<=0x4016cbe3) { /* |x| <= ~3pi/4 */ 62152596Sbde if(hx>0) 63152596Sbde return __kernel_cosdf(x - s1pio2); 64152596Sbde else 65152596Sbde return -__kernel_cosdf(x + s1pio2); 66152596Sbde } else 67152596Sbde return -__kernel_sindf(x + (hx > 0 ? -s2pio2 : s2pio2)); 68152596Sbde } 69152596Sbde if(ix<=0x40e231d5) { /* |x| <= ~9*pi/4 */ 70152596Sbde if(ix<=0x40afeddf) { /* |x| <= ~7*pi/4 */ 71152596Sbde if(hx>0) 72152596Sbde return -__kernel_cosdf(x - s3pio2); 73152596Sbde else 74152596Sbde return __kernel_cosdf(x + s3pio2); 75152596Sbde } else 76152596Sbde return __kernel_sindf(x + (hx > 0 ? -s4pio2 : s4pio2)); 77152596Sbde } 782116Sjkh 792116Sjkh /* sin(Inf or NaN) is NaN */ 802116Sjkh else if (ix>=0x7f800000) return x-x; 812116Sjkh 82152596Sbde /* general argument reduction needed */ 832116Sjkh else { 842116Sjkh n = __ieee754_rem_pio2f(x,y); 852116Sjkh switch(n&3) { 862116Sjkh case 0: return __kernel_sinf(y[0],y[1],1); 872116Sjkh case 1: return __kernel_cosf(y[0],y[1]); 882116Sjkh case 2: return -__kernel_sinf(y[0],y[1],1); 892116Sjkh default: 902116Sjkh return -__kernel_cosf(y[0],y[1]); 912116Sjkh } 922116Sjkh } 932116Sjkh} 94