31 lines
632 B
C
31 lines
632 B
C
/*
|
|
(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
|
|
See the copyright notice in the ACK home directory, in the file "Copyright".
|
|
*/
|
|
|
|
/* $Header$ */
|
|
|
|
/*
|
|
SUBTRACT TWO FLOATS - DOUBLE Precision (SBF 8)
|
|
*/
|
|
|
|
#include "FP_types.h"
|
|
|
|
extern _double adf8();
|
|
|
|
_double
|
|
sbf8(s2,s1)
|
|
_double s1,s2;
|
|
{
|
|
unsigned char *p; /* sufficient to access sign bit */
|
|
_double *result = &s1; /* s1 may not be in a register! */
|
|
|
|
if (s2.__double[0] == 0 && s2.__double[1] == 0) {
|
|
return s1;
|
|
}
|
|
p = (unsigned char *) &s2;
|
|
*p ^= 0x80; /* change sign of s2 */
|
|
*result = adf8(s2,s1); /* add and return result */
|
|
return(s1);
|
|
}
|