1 /* e_remainderf.c -- float version of e_remainder.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 <sys/cdefs.h> 17 __FBSDID("$FreeBSD$"); 18 19 #include "math.h" 20 #include "math_private.h" 21 22 static const float zero = 0.0; 23 24 25 float 26 __ieee754_remainderf(float x, float p) 27 { 28 int32_t hx,hp; 29 u_int32_t sx; 30 float p_half; 31 32 GET_FLOAT_WORD(hx,x); 33 GET_FLOAT_WORD(hp,p); 34 sx = hx&0x80000000; 35 hp &= 0x7fffffff; 36 hx &= 0x7fffffff; 37 38 /* purge off exception values */ 39 if(hp==0) return (x*p)/(x*p); /* p = 0 */ 40 if((hx>=0x7f800000)|| /* x not finite */ 41 ((hp>0x7f800000))) /* p is NaN */ 42 return ((long double)x*p)/((long double)x*p); 43 44 45 if (hp<=0x7effffff) x = __ieee754_fmodf(x,p+p); /* now x < 2p */ 46 if ((hx-hp)==0) return zero*x; 47 x = fabsf(x); 48 p = fabsf(p); 49 if (hp<0x01000000) { 50 if(x+x>p) { 51 x-=p; 52 if(x+x>=p) x -= p; 53 } 54 } else { 55 p_half = (float)0.5*p; 56 if(x>p_half) { 57 x-=p; 58 if(x>=p_half) x -= p; 59 } 60 } 61 GET_FLOAT_WORD(hx,x); 62 if ((hx&0x7fffffff)==0) hx = 0; 63 SET_FLOAT_WORD(x,hx^sx); 64 return x; 65 } 66
