minix/lib/ack/fphook/sft_ext.fc
2009-11-09 10:26:00 +00:00

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681 B
Text

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