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