[Bug rtl-optimization/57417] New: hang on volatile int array

["su at cs dot ucdavis.edu" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57417

            Bug ID: 57417
           Summary: hang on volatile int array
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu

The following code causes gcc trunk (and the 4.7 & 4.8 branches) to hang at -O1
or above. This seems to be different from 57381, but perhaps related.

$ gcc-trunk -v
Target: x86_64-unknown-linux-gnu
gcc version 4.9.0 20130525 (experimental) [trunk revision 199323] (GCC)
$ gcc-trunk -m32 -O0 -c small.c
$ gcc-trunk -m32 -O1 -c small.c
^C
$ cat small.c
int a, b, c;

void foo ()
{
  volatile int d[1];
  b = 0;
  for (;; a--)
    c = (int)&d[b];
}