1 /* sf_sin.c -- float version of s_sin.c. 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian (at) 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 "fdlibm.h" 17 18 #ifdef __STDC__ 19 float sinf(float x) 20 #else 21 float sinf(x) 22 float x; 23 #endif 24 { 25 float y[2],z=0.0; 26 __int32_t n,ix; 27 28 GET_FLOAT_WORD(ix,x); 29 30 /* |x| ~< pi/4 */ 31 ix &= 0x7fffffff; 32 if(ix <= 0x3f490fd8) return __kernel_sinf(x,z,0); 33 34 /* sin(Inf or NaN) is NaN */ 35 else if (!FLT_UWORD_IS_FINITE(ix)) return x-x; 36 37 /* argument reduction needed */ 38 else { 39 n = __ieee754_rem_pio2f(x,y); 40 switch(n&3) { 41 case 0: return __kernel_sinf(y[0],y[1],1); 42 case 1: return __kernel_cosf(y[0],y[1]); 43 case 2: return -__kernel_sinf(y[0],y[1],1); 44 default: 45 return -__kernel_cosf(y[0],y[1]); 46 } 47 } 48 } 49 50 #ifdef _DOUBLE_IS_32BITS 51 52 #ifdef __STDC__ 53 double sin(double x) 54 #else 55 double sin(x) 56 double x; 57 #endif 58 { 59 return (double) sinf((float) x); 60 } 61 62 #endif /* defined(_DOUBLE_IS_32BITS) */ 63
