[Bug sanitizer/59503] New: Bogus integer-overflow error with long long with -m32

[mpolacek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59503

            Bug ID: 59503
           Summary: Bogus integer-overflow error with long long with -m32
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org

We wrongly issue runtime error on:

int
main (void)
{
  long long int a = 14;
  long int b = 9;
  if ((a - b) != 5)
    __builtin_abort ();
  return 0;
}

$ gcc -O0 -fsanitize=signed-integer-overflow -m32 bug.c
$ ./a.out
bug.c:6:10: runtime error: signed integer overflow: 14 - 9 cannot be
represented in type 'long long int'
Aborted

This happens on PPC64 as well, as the bug is in generic handling of add/sub
instrumentation.