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  • Committer: Bazaar Package Importer
  • Author(s): Christoph Martin
  • Date: 2004-05-24 17:02:29 UTC
  • Revision ID: james.westby@ubuntu.com-20040524170229-ixlo08bbbly0xied
Tags: upstream-0.9.7d
Import upstream version 0.9.7d

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bugs/sgiccbug.c
 
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/* NOCW */
 
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/* sgibug.c */
 
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/* bug found by Eric Young (eay@mincom.oz.au) May 95 */
 
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#include <stdio.h>
 
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/* This compiler bug it present on IRIX 5.3, 5.1 and 4.0.5 (these are
 
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 * the only versions of IRIX I have access to.
 
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 * defining FIXBUG removes the bug.
 
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 * (bug is still present in IRIX 6.3 according to
 
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 * Gage <agage@forgetmenot.Mines.EDU>
 
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 */
 
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/* Compare the output from
 
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 * cc sgiccbug.c; ./a.out
 
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 * and
 
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 * cc -O sgiccbug.c; ./a.out
 
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 */
 
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static unsigned long a[4]={0x01234567,0x89ABCDEF,0xFEDCBA98,0x76543210};
 
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static unsigned long b[4]={0x89ABCDEF,0xFEDCBA98,0x76543210,0x01234567};
 
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static unsigned long c[4]={0x77777778,0x8ACF1357,0x88888888,0x7530ECA9};
 
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main()
 
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        {
 
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        unsigned long r[4];
 
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        sub(r,a,b);
 
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        fprintf(stderr,"input a= %08X %08X %08X %08X\n",a[3],a[2],a[1],a[0]);
 
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        fprintf(stderr,"input b= %08X %08X %08X %08X\n",b[3],b[2],b[1],b[0]);
 
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        fprintf(stderr,"output = %08X %08X %08X %08X\n",r[3],r[2],r[1],r[0]);
 
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        fprintf(stderr,"correct= %08X %08X %08X %08X\n",c[3],c[2],c[1],c[0]);
 
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        }
 
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int sub(r,a,b)
 
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unsigned long *r,*a,*b;
 
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        {
 
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        register unsigned long t1,t2,*ap,*bp,*rp;
 
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        int i,carry;
 
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#ifdef FIXBUG
 
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        unsigned long dummy;
 
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#endif
 
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        ap=a;
 
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        bp=b;
 
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        rp=r;
 
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        carry=0;
 
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        for (i=0; i<4; i++)
 
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                {
 
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                t1= *(ap++);
 
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                t2= *(bp++);
 
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                t1=(t1-t2);
 
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#ifdef FIXBUG
 
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                dummy=t1;
 
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#endif
 
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                *(rp++)=t1&0xffffffff;
 
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                }
 
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        }