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