| /* sf_sin.c -- float version of s_sin.c. |
| * Conversion to float by Ian Lance Taylor, Cygnus Support, [email protected]. |
| */ |
| |
| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunPro, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */ |
| |
| #include "fdlibm.h" |
| |
| #ifdef __STDC__ |
| float sinf(float x) |
| #else |
| float sinf(x) |
| float x; |
| #endif |
| { |
| float y[2],z=0.0; |
| __int32_t n,ix; |
| |
| GET_FLOAT_WORD(ix,x); |
| |
| /* |x| ~< pi/4 */ |
| ix &= 0x7fffffff; |
| if(ix <= 0x3f490fd8) return __kernel_sinf(x,z,0); |
| |
| /* sin(Inf or NaN) is NaN */ |
| else if (!FLT_UWORD_IS_FINITE(ix)) return x-x; |
| |
| /* argument reduction needed */ |
| else { |
| n = __ieee754_rem_pio2f(x,y); |
| switch(n&3) { |
| case 0: return __kernel_sinf(y[0],y[1],1); |
| case 1: return __kernel_cosf(y[0],y[1]); |
| case 2: return -__kernel_sinf(y[0],y[1],1); |
| default: |
| return -__kernel_cosf(y[0],y[1]); |
| } |
| } |
| } |
| |
| #ifdef _DOUBLE_IS_32BITS |
| |
| #ifdef __STDC__ |
| double sin(double x) |
| #else |
| double sin(x) |
| double x; |
| #endif |
| { |
| return (double) sinf((float) x); |
| } |
| |
| #endif /* defined(_DOUBLE_IS_32BITS) */ |
