[Bug tree-optimization/26763] New: wrong final value of indaction variable calculated

["debian-gcc at lists dot debian dot org" <gcc-bugzilla at gcc dot gnu dot org>]

[ forwarded from http://bugs.debian.org/356896 ]

void abort(void);

__attribute__((noinline))
int *foo(int *start) {
    int *tmp;
    for (tmp = start + 100; tmp > start; --tmp) ;
    return tmp;
}

int main() {
  int x[100];

  if (foo(x) != x)
      abort();

  return 0;
}

aborts with 4.1.0 20051124 at -O1 or higher
does not abort at -O0, or with 4.0.3 or 4.2.0 20060304


-- 
           Summary: wrong final value of indaction variable calculated
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: debian-gcc at lists dot debian dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26763