1 /* e_remainderf.c -- float version of e_remainder.c. 2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@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 #if defined(LIBM_SCCS) && !defined(lint) 18 __RCSID("$NetBSD: e_remainderf.c,v 1.7 2002/05/26 22:01:52 wiz Exp $"); 19 #endif 20 21 #include "math.h" 22 #include "math_private.h" 23 24 static const float zero = 0.0; 25 26 27 float 28 __ieee754_remainderf(float x, float p) 29 { 30 int32_t hx,hp; 31 u_int32_t sx; 32 float p_half; 33 34 GET_FLOAT_WORD(hx,x); 35 GET_FLOAT_WORD(hp,p); 36 sx = hx&0x80000000; 37 hp &= 0x7fffffff; 38 hx &= 0x7fffffff; 39 40 /* purge off exception values */ 41 if(hp==0) return (x*p)/(x*p); /* p = 0 */ 42 if((hx>=0x7f800000)|| /* x not finite */ 43 ((hp>0x7f800000))) /* p is NaN */ 44 return (x*p)/(x*p); 45 46 47 if (hp<=0x7effffff) x = __ieee754_fmodf(x,p+p); /* now x < 2p */ 48 if ((hx-hp)==0) return zero*x; 49 x = fabsf(x); 50 p = fabsf(p); 51 if (hp<0x01000000) { 52 if(x+x>p) { 53 x-=p; 54 if(x+x>=p) x -= p; 55 } 56 } else { 57 p_half = (float)0.5*p; 58 if(x>p_half) { 59 x-=p; 60 if(x>=p_half) x -= p; 61 } 62 } 63 GET_FLOAT_WORD(hx,x); 64 SET_FLOAT_WORD(x,hx^sx); 65 return x; 66 } 67