| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunSoft, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */ |
| |
| #include "bsd_private.h" |
| |
| double bsd__ieee754_remainder(double x, double p) |
| { |
| int32_t hx,hp; |
| u_int32_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 ((long double)x*p)/((long double)x*p); |
| |
| |
| if (hp<=0x7fdfffff) x = bsd__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); |
| if ((hx&0x7fffffff)==0) hx = 0; |
| SET_HIGH_WORD(x,hx^sx); |
| return x; |
| } |
