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From: 3003jalp@ucsbuxa.ucsb.edu (Applied Magnetics)
Newsgroups: comp.unix.aix
Subject: Re: XLF optimizer unreliable, inappropriate for benchmarks
Keywords: fortran benchmark optimizer aix 6000
Message-ID: <6322@hub.ucsb.edu>
Date: 20 Sep 90 23:04:12 GMT
References: <384@nwnexus.WA.COM>
Sender: news@hub.ucsb.edu
Lines: 34

In article <384@nwnexus.WA.COM> golder@nwnexus.WA.COM (Warren Jones) writes:

> [ gives a short Fortran program that optimizes incorrectly ]
>Incidentally -- does anyone know if all the XL languages (including
>C and Pascal) use the same optimizer?  Until I'm sure of the
>answer, I'm not using the C optimizer either.

Well, I transliterated your example to C and got the same behaviour.
Congratulations to your programmer for producing such a small example.

#include <stdio.h>

main()
{
    int b, i, k, m, n; 
    int test;

    test= 1;
    i= k= m= 0;

    do {
        i++;
        if(test) {
            for(n= 0; n<3; n++) {
              m++;
              k++;
              b= k+1;
            }
            printf("k= %d,  k-1= %d\n", k, k-1);
        }
    } while(i<2);
}

-- P. Asselin, Applied Magnetics Corp.