Last change
on this file was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.2 KB
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Rev | Line | |
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[444] | 1 | |
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| 2 | /* @(#)s_fabs.c 5.1 93/09/24 */ |
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| 3 | /* |
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| 4 | * ==================================================== |
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| 5 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 6 | * |
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| 7 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 8 | * Permission to use, copy, modify, and distribute this |
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| 9 | * software is freely granted, provided that this notice |
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| 10 | * is preserved. |
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| 11 | * ==================================================== |
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| 12 | */ |
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| 13 | |
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| 14 | /* |
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| 15 | FUNCTION |
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| 16 | <<fabs>>, <<fabsf>>---absolute value (magnitude) |
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| 17 | INDEX |
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| 18 | fabs |
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| 19 | INDEX |
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| 20 | fabsf |
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| 21 | |
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| 22 | SYNOPSIS |
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| 23 | #include <math.h> |
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| 24 | double fabs(double <[x]>); |
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| 25 | float fabsf(float <[x]>); |
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| 26 | |
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| 27 | DESCRIPTION |
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| 28 | <<fabs>> and <<fabsf>> calculate |
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| 29 | @tex |
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| 30 | $|x|$, |
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| 31 | @end tex |
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| 32 | the absolute value (magnitude) of the argument <[x]>, by direct |
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| 33 | manipulation of the bit representation of <[x]>. |
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| 34 | |
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| 35 | RETURNS |
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| 36 | The calculated value is returned. No errors are detected. |
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| 37 | |
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| 38 | PORTABILITY |
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| 39 | <<fabs>> is ANSI. |
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| 40 | <<fabsf>> is an extension. |
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| 41 | |
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| 42 | */ |
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| 43 | |
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| 44 | /* |
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| 45 | * fabs(x) returns the absolute value of x. |
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| 46 | */ |
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| 47 | |
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| 48 | #include "fdlibm.h" |
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| 49 | |
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| 50 | #ifndef _DOUBLE_IS_32BITS |
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| 51 | |
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| 52 | #ifdef __STDC__ |
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| 53 | double fabs(double x) |
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| 54 | #else |
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| 55 | double fabs(x) |
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| 56 | double x; |
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| 57 | #endif |
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| 58 | { |
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| 59 | __uint32_t high; |
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| 60 | GET_HIGH_WORD(high,x); |
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| 61 | SET_HIGH_WORD(x,high&0x7fffffff); |
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| 62 | return x; |
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| 63 | } |
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| 64 | |
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| 65 | #endif /* _DOUBLE_IS_32BITS */ |
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