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| 4349 | Serge | 1 | /* Copyright (C) 2002 by Red Hat, Incorporated. All rights reserved. |
| 2 | * |
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| 3 | * Permission to use, copy, modify, and distribute this software |
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| 4 | * is freely granted, provided that this notice is preserved. |
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| 5 | */ |
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| 6 | /* |
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| 7 | FUNCTION |
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| 8 | < |
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| 9 | INDEX |
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| 10 | fdim |
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| 11 | INDEX |
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| 12 | fdimf |
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| 13 | |||
| 14 | ANSI_SYNOPSIS |
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| 15 | #include |
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| 16 | double fdim(double <[x]>, double <[y]>); |
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| 17 | float fdimf(float <[x]>, float <[y]>); |
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| 18 | |||
| 19 | DESCRIPTION |
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| 20 | The < |
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| 21 | arguments, returning: |
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| 22 | . <[x]> - <[y]> if <[x]> > <[y]>, or |
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| 23 | @ifnottex |
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| 24 | . +0 if <[x]> <= <[y]>, or |
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| 25 | @end ifnottex |
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| 26 | @tex |
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| 27 | . +0 if <[x]> $\leq$ <[y]>, or |
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| 28 | @end tex |
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| 29 | . NAN if either argument is NAN. |
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| 30 | A range error may occur. |
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| 31 | |||
| 32 | RETURNS |
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| 33 | The < |
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| 34 | |||
| 35 | PORTABILITY |
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| 36 | ANSI C, POSIX. |
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| 37 | |||
| 38 | */ |
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| 39 | |||
| 40 | #include "fdlibm.h" |
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| 41 | |||
| 42 | #ifndef _DOUBLE_IS_32BITS |
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| 43 | |||
| 44 | #ifdef __STDC__ |
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| 45 | double fdim(double x, double y) |
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| 46 | #else |
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| 47 | double fdim(x,y) |
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| 48 | double x; |
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| 49 | double y; |
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| 50 | #endif |
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| 51 | { |
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| 52 | int c = __fpclassifyd(x); |
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| 53 | if (c == FP_NAN) return(x); |
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| 54 | if (__fpclassifyd(y) == FP_NAN) return(y); |
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| 55 | if (c == FP_INFINITE) |
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| 56 | return HUGE_VAL; |
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| 57 | |||
| 58 | return x > y ? x - y : 0.0; |
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| 59 | } |
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| 60 | |||
| 61 | #endif /* _DOUBLE_IS_32BITS */ |