[Bug c/12569] New: Incorrect result on pathological code

[s0094247 at sms dot ed dot ac dot uk]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12569

           Summary: Incorrect result on pathological code
           Product: gcc
           Version: 3.2.2
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: s0094247 at sms dot ed dot ac dot uk
                CC: gcc-bugs at gcc dot gnu dot org

int a;
a = 2;
printf ("%d\n", --a + a++); /* Should be 2, produces 2 */
a = 2;
printf ("%d\n", a++ + --a); /* Should be 4, produces 2 */
if ((--a + a++) == (a++ + --a))
    printf ("This bit however does not get executed\n");

Yes it's pathological but could be indicative of something worse.