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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /* e_remainderf.c -- float version of e_remainder.c. |
| 2 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
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| 3 | */ |
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| 4 | |||
| 5 | /* |
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| 6 | * ==================================================== |
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| 7 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 8 | * |
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| 9 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 10 | * Permission to use, copy, modify, and distribute this |
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| 11 | * software is freely granted, provided that this notice |
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| 12 | * is preserved. |
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| 13 | * ==================================================== |
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| 14 | */ |
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| 15 | |||
| 16 | #ifndef lint |
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| 17 | static char rcsid[] = "$\Id: e_remainderf.c,v 1.2 1995/05/30 05:48:40 rgrimes Exp $"; |
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| 18 | #endif |
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| 19 | |||
| 20 | #include "math.h" |
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| 21 | #include "math_private.h" |
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| 22 | |||
| 23 | #ifdef __STDC__ |
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| 24 | static const float zero = 0.0; |
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| 25 | #else |
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| 26 | static float zero = 0.0; |
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| 27 | #endif |
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| 28 | |||
| 29 | |||
| 30 | #ifdef __STDC__ |
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| 31 | float __ieee754_remainderf(float x, float p) |
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| 32 | #else |
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| 33 | float __ieee754_remainderf(x,p) |
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| 34 | float x,p; |
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| 35 | #endif |
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| 36 | { |
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| 37 | int32_t hx,hp; |
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| 38 | u_int32_t sx; |
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| 39 | float p_half; |
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| 40 | |||
| 41 | GET_FLOAT_WORD(hx,x); |
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| 42 | GET_FLOAT_WORD(hp,p); |
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| 43 | sx = hx&0x80000000; |
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| 44 | hp &= 0x7fffffff; |
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| 45 | hx &= 0x7fffffff; |
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| 46 | |||
| 47 | /* purge off exception values */ |
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| 48 | if(hp==0) return (x*p)/(x*p); /* p = 0 */ |
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| 49 | if((hx>=0x7f800000)|| /* x not finite */ |
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| 50 | ((hp>0x7f800000))) /* p is NaN */ |
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| 51 | return (x*p)/(x*p); |
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| 52 | |||
| 53 | |||
| 54 | if (hp<=0x7effffff) x = __ieee754_fmodf(x,p+p); /* now x < 2p */ |
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| 55 | if ((hx-hp)==0) return zero*x; |
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| 56 | x = fabsf(x); |
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| 57 | p = fabsf(p); |
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| 58 | if (hp<0x01000000) { |
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| 59 | if(x+x>p) { |
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| 60 | x-=p; |
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| 61 | if(x+x>=p) x -= p; |
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| 62 | } |
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| 63 | } else { |
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| 64 | p_half = (float)0.5*p; |
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| 65 | if(x>p_half) { |
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| 66 | x-=p; |
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| 67 | if(x>=p_half) x -= p; |
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| 68 | } |
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| 69 | } |
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| 70 | GET_FLOAT_WORD(hx,x); |
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| 71 | SET_FLOAT_WORD(x,hx^sx); |
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| 72 | return x; |
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| 73 | } |