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