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Last change
on this file since 1392 was 2, checked in by bird, 23 years ago |
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Initial revision
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Property cvs2svn:cvs-rev
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1.1
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Property svn:eol-style
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native
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Property svn:executable
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*
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File size:
1.3 KB
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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 | ANSI_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 | TRAD_SYNOPSIS
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| 28 | #include <math.h>
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| 29 | double fabs(<[x]>)
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| 30 | double <[x]>;
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| 31 |
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| 32 | float fabsf(<[x]>)
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| 33 | float <[x]>;
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| 34 |
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| 35 | DESCRIPTION
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| 36 | <<fabs>> and <<fabsf>> calculate
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| 37 | @tex
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| 38 | $|x|$,
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| 39 | @end tex
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| 40 | the absolute value (magnitude) of the argument <[x]>, by direct
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| 41 | manipulation of the bit representation of <[x]>.
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| 42 |
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| 43 | RETURNS
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| 44 | The calculated value is returned. No errors are detected.
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| 45 |
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| 46 | PORTABILITY
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| 47 | <<fabs>> is ANSI.
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| 48 | <<fabsf>> is an extension.
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| 49 |
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| 50 | */
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| 51 |
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| 52 | /*
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| 53 | * fabs(x) returns the absolute value of x.
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| 54 | */
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| 55 |
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| 56 | #include "fdlibm.h"
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| 57 |
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| 58 | #ifndef _DOUBLE_IS_32BITS
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| 59 |
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| 60 | #ifdef __STDC__
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| 61 | double fabs(double x)
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| 62 | #else
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| 63 | double fabs(x)
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| 64 | double x;
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| 65 | #endif
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| 66 | {
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| 67 | uint32_t high;
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| 68 | GET_HIGH_WORD(high,x);
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| 69 | SET_HIGH_WORD(x,high&0x7fffffff);
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| 70 | return x;
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| 71 | }
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| 72 |
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| 73 | #endif /* _DOUBLE_IS_32BITS */
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