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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libm/] [math/] [e_remainder.c] - Rev 207
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/* @(#)e_remainder.c 5.1 93/09/24 */ /* * ==================================================== * 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. * ==================================================== */ /* __ieee754_remainder(x,p) * Return : * returns x REM p = x - [x/p]*p as if in infinite * precise arithmetic, where [x/p] is the (infinite bit) * integer nearest x/p (in half way case choose the even one). * Method : * Based on fmod() return x-[x/p]chopped*p exactlp. */ #include "fdlibm.h" #ifndef _DOUBLE_IS_32BITS #ifdef __STDC__ static const double zero = 0.0; #else static double zero = 0.0; #endif #ifdef __STDC__ double __ieee754_remainder(double x, double p) #else double __ieee754_remainder(x,p) double x,p; #endif { __int32_t hx,hp; __uint32_t sx,lx,lp; double p_half; EXTRACT_WORDS(hx,lx,x); EXTRACT_WORDS(hp,lp,p); sx = hx&0x80000000; hp &= 0x7fffffff; hx &= 0x7fffffff; /* purge off exception values */ if((hp|lp)==0) return (x*p)/(x*p); /* p = 0 */ if((hx>=0x7ff00000)|| /* x not finite */ ((hp>=0x7ff00000)&& /* p is NaN */ (((hp-0x7ff00000)|lp)!=0))) return (x*p)/(x*p); if (hp<=0x7fdfffff) x = __ieee754_fmod(x,p+p); /* now x < 2p */ if (((hx-hp)|(lx-lp))==0) return zero*x; x = fabs(x); p = fabs(p); if (hp<0x00200000) { if(x+x>p) { x-=p; if(x+x>=p) x -= p; } } else { p_half = 0.5*p; if(x>p_half) { x-=p; if(x>=p_half) x -= p; } } GET_HIGH_WORD(hx,x); SET_HIGH_WORD(x,hx^sx); return x; } #endif /* defined(_DOUBLE_IS_32BITS) */
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