| 1 | /* sf_modf.c -- float version of s_modf.c. |
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| 2 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
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| 3 | */ |
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| 4 | |
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| 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 | |
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| 16 | #include "fdlibm.h" |
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| 17 | |
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| 18 | #ifdef __STDC__ |
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| 19 | static const float one = 1.0; |
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| 20 | #else |
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| 21 | static float one = 1.0; |
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| 22 | #endif |
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| 23 | |
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| 24 | #ifdef __STDC__ |
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| 25 | float modff(float x, float *iptr) |
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| 26 | #else |
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| 27 | float modff(x, iptr) |
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| 28 | float x,*iptr; |
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| 29 | #endif |
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| 30 | { |
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| 31 | __int32_t i0,j0; |
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| 32 | __uint32_t i; |
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| 33 | GET_FLOAT_WORD(i0,x); |
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| 34 | j0 = ((i0>>23)&0xff)-0x7f; /* exponent of x */ |
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| 35 | if(j0<23) { /* integer part in x */ |
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| 36 | if(j0<0) { /* |x|<1 */ |
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| 37 | SET_FLOAT_WORD(*iptr,i0&0x80000000); /* *iptr = +-0 */ |
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| 38 | return x; |
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| 39 | } else { |
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| 40 | i = (0x007fffff)>>j0; |
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| 41 | if((i0&i)==0) { /* x is integral */ |
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| 42 | __uint32_t ix; |
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| 43 | *iptr = x; |
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| 44 | GET_FLOAT_WORD(ix,x); |
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| 45 | SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ |
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| 46 | return x; |
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| 47 | } else { |
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| 48 | SET_FLOAT_WORD(*iptr,i0&(~i)); |
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| 49 | return x - *iptr; |
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| 50 | } |
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| 51 | } |
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| 52 | } else { /* no fraction part */ |
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| 53 | __uint32_t ix; |
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| 54 | *iptr = x*one; |
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| 55 | GET_FLOAT_WORD(ix,x); |
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| 56 | SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ |
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| 57 | return x; |
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| 58 | } |
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| 59 | } |
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| 60 | |
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| 61 | #ifdef _DOUBLE_IS_32BITS |
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| 62 | |
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| 63 | #ifdef __STDC__ |
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| 64 | double modf(double x, double *iptr) |
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| 65 | #else |
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| 66 | double modf(x, iptr) |
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| 67 | double x,*iptr; |
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| 68 | #endif |
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| 69 | { |
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| 70 | return (double) modff((float) x, (float *) iptr); |
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| 71 | } |
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| 72 | |
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| 73 | #endif /* defined(_DOUBLE_IS_32BITS) */ |
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