faddsubd.c
1.86 KB
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/*
* fpu/faddsubd.c
*
*
*
* Copyright 1991, Silicon Graphics, Inc.
* All Rights Reserved.
*
* This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics, Inc.;
* the contents of this file may not be disclosed to third parties, copied or
* duplicated in any form, in whole or in part, without the prior written
* permission of Silicon Graphics, Inc.
*
* RESTRICTED RIGHTS LEGEND:
* Use, duplication or disclosure by the Government is subject to restrictions
* as set forth in subdivision (c)(1)(ii) of the Rights in Technical Data
* and Computer Software clause at DFARS 252.227-7013, and/or in similar or
* successor clauses in the FAR, DOD or NASA FAR Supplement. Unpublished -
* rights reserved under the Copyright Laws of the United States.
*/
#ident "$Revision: 1.1.1.1 $"
/*
*
* Floating Point Exerciser - basic functions with simple double
* precision arithmetic (addition and subtraction)
*
*/
#include <ultra64.h>
#include <os_internal.h>
#include <osint.h>
#include <fpu.h>
#define TESTPAT 0xdbeef
int
faddsubd()
{
double f1, f2, f3;
register long i1;
register long status;
register int fail;
fail = 0;
/* enable cache and fpu - cache ecc errors not disabled */
status = __osGetSR();
status |= (SR_CU0|SR_CU1);
__osSetSR(status);
/* clear cause register */
__osSetCause(0);
/* clear fpu status register */
__osSetFpcCsr(0);
/* try some simple double precision arithmetic operations */
i1 = TESTPAT; /* start with fixed point number */
f1 = i1; /* convert to floating point */
f2 = f1 + f1;
f3 = f2 - f1;
if (f3 != f1) {
fail = 1;
}
if (f3 == f2){
fail = 1;
}
i1 = f3; /* convert back to fixed point number */
if (i1 != TESTPAT){
fail = 1;
}
if (__osGetFpcCsr()){
fail = 1;
}
/* report any error */
return(fail);
}