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Annotation of 43BSDTahoe/usr.lib/libF77/d_sign.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1980 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  *
                      6:  *     @(#)d_sign.c    5.2     11/3/86
                      7:  */
                      8: 
                      9: #ifndef tahoe
                     10: double d_sign(a,b)
                     11: double *a, *b;
                     12: {
                     13: double x;
                     14: x = (*a >= 0 ? *a : - *a);
                     15: return( *b >= 0 ? x : -x);
                     16: }
                     17: 
                     18: #else tahoe
                     19: 
                     20: #include <tahoemath/FP.h>
                     21: 
                     22: double d_sign(a,b)
                     23: double *a, *b;
                     24: {
                     25: double x;
                     26: x = *a;
                     27: if ((*a < 0) || (*b < 0))
                     28:        *(unsigned long *)&x ^= SIGN_BIT;
                     29: return(x);
                     30: }
                     31: #endif tahoe

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