source: trunk/minix/lib/ack/float/sft_ext.fc@ 12

/*
  (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
  See the copyright notice in the ACK home directory, in the file "Copyright".
*/

/* $Header: /cvsup/minix/src/lib/ack/float/sft_ext.fc,v 1.1 2005/10/10 15:27:43 beng Exp $ */

/*
        SHIFT TWO EXTENDED NUMBERS INTO PROPER
        ALIGNMENT FOR ADDITION (exponents are equal)
        Numbers should not be zero on entry.
*/

#include "FP_types.h"

void
sft_ext(e1,e2)
EXTEND  *e1,*e2;
{
        register        EXTEND  *s;
        register        int     diff;

        diff = e1->exp - e2->exp;

        if (!diff)
                return; /* exponents are equal  */

        if (diff < 0)   { /* e2 is larger       */
                        /* shift e1             */
                diff = -diff;
                s = e1;
        }
        else            /* e1 is larger         */
                        /* shift e2             */
                s = e2;

        s->exp += diff;
        b64_sft(&(s->mantissa), diff);
}