| |
| /* @(#)s_fabs.c 5.1 93/09/24 */ |
| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunPro, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */ |
| |
| /* |
| FUNCTION |
| <<fabs>>, <<fabsf>>---absolute value (magnitude) |
| INDEX |
| fabs |
| INDEX |
| fabsf |
| |
| ANSI_SYNOPSIS |
| #include <math.h> |
| double fabs(double <[x]>); |
| float fabsf(float <[x]>); |
| |
| TRAD_SYNOPSIS |
| #include <math.h> |
| double fabs(<[x]>) |
| double <[x]>; |
| |
| float fabsf(<[x]>) |
| float <[x]>; |
| |
| DESCRIPTION |
| <<fabs>> and <<fabsf>> calculate |
| @tex |
| $|x|$, |
| @end tex |
| the absolute value (magnitude) of the argument <[x]>, by direct |
| manipulation of the bit representation of <[x]>. |
| |
| RETURNS |
| The calculated value is returned. No errors are detected. |
| |
| PORTABILITY |
| <<fabs>> is ANSI. |
| <<fabsf>> is an extension. |
| |
| */ |
| |
| /* |
| * fabs(x) returns the absolute value of x. |
| */ |
| |
| #include "fdlibm.h" |
| |
| #ifndef _DOUBLE_IS_32BITS |
| |
| #ifdef __STDC__ |
| double fabs(double x) |
| #else |
| double fabs(x) |
| double x; |
| #endif |
| { |
| uint32_t high; |
| GET_HIGH_WORD(high,x); |
| SET_HIGH_WORD(x,high&0x7fffffff); |
| return x; |
| } |
| |
| #endif /* _DOUBLE_IS_32BITS */ |
