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Annotation of 43BSDTahoe/usr.lib/libF77/r_mod.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:  *     @(#)r_mod.c     5.4     11/3/86
        !             7:  */
        !             8: 
        !             9: #ifndef tahoe
        !            10: float flt_retval;
        !            11: 
        !            12: float r_mod(x,y)
        !            13: float *x, *y;
        !            14: {
        !            15: double floor(), quotient = *x / *y;
        !            16: if (quotient >= 0.0)
        !            17:        quotient = floor(quotient);
        !            18: else
        !            19:        quotient = -floor(-quotient);
        !            20: flt_retval = *x - (*y) * quotient ;
        !            21: return(flt_retval);
        !            22: }
        !            23: 
        !            24: #else tahoe
        !            25: 
        !            26: /*   THIS IS BASED ON THE TAHOE REPR. FOR FLOATING POINT */
        !            27: #include <tahoemath/FP.h>
        !            28: 
        !            29: double r_mod(x,y)
        !            30: float *x, *y;
        !            31: {
        !            32: double floor(), quotient = *x / *y;
        !            33: if (quotient >= 0.0)
        !            34:        quotient = floor(quotient);
        !            35: else {
        !            36:        *(unsigned long *)&quotient ^= SIGN_BIT;
        !            37:        quotient = floor(quotient);
        !            38:        if (quotient != 0)
        !            39:                *(unsigned long *)&quotient ^= SIGN_BIT;
        !            40:        }
        !            41: return(*x - (*y) * quotient );
        !            42: }
        !            43: #endif tahoe

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