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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* ef_remainder.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 | #include "fdlibm.h" |
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| 17 | |||
| 18 | #ifdef __STDC__ |
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| 19 | static const float zero = 0.0; |
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| 20 | #else |
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| 21 | static float zero = 0.0; |
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| 22 | #endif |
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| 23 | |||
| 24 | |||
| 25 | #ifdef __STDC__ |
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| 26 | float __ieee754_remainderf(float x, float p) |
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| 27 | #else |
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| 28 | float __ieee754_remainderf(x,p) |
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| 29 | float x,p; |
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| 30 | #endif |
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| 31 | { |
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| 32 | __int32_t hx,hp; |
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| 33 | __uint32_t sx; |
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| 34 | float p_half; |
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| 35 | |||
| 36 | GET_FLOAT_WORD(hx,x); |
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| 37 | GET_FLOAT_WORD(hp,p); |
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| 38 | sx = hx&0x80000000; |
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| 39 | hp &= 0x7fffffff; |
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| 40 | hx &= 0x7fffffff; |
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| 41 | |||
| 42 | /* purge off exception values */ |
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| 43 | if(FLT_UWORD_IS_ZERO(hp)|| |
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| 44 | !FLT_UWORD_IS_FINITE(hx)|| |
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| 45 | FLT_UWORD_IS_NAN(hp)) |
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| 46 | return (x*p)/(x*p); |
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| 47 | |||
| 48 | |||
| 49 | if (hp<=FLT_UWORD_HALF_MAX) x = __ieee754_fmodf(x,p+p); /* now x < 2p */ |
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| 50 | if ((hx-hp)==0) return zero*x; |
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| 51 | x = fabsf(x); |
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| 52 | p = fabsf(p); |
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| 53 | if (hp<0x01000000) { |
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| 54 | if(x+x>p) { |
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| 55 | x-=p; |
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| 56 | if(x+x>=p) x -= p; |
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| 57 | } |
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| 58 | } else { |
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| 59 | p_half = (float)0.5*p; |
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| 60 | if(x>p_half) { |
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| 61 | x-=p; |
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| 62 | if(x>=p_half) x -= p; |
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| 63 | } |
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| 64 | } |
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| 65 | GET_FLOAT_WORD(hx,x); |
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| 66 | SET_FLOAT_WORD(x,hx^sx); |
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| 67 | return x; |
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| 68 | } |