[Bug target/45327] New: [4.6 Regression] ICE: SIGSEGV in rtx_equal_p (rtl.c:496) with -O1 -funroll-loops -fnon-call-exceptions

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

Command line:
$ gcc -O1 -funroll-loops -fnon-call-exceptions testcase.c

Valgrind output:
==17265== Invalid read of size 2
==17265==    at 0x82C2FB: rtx_equal_p (rtl.c:495)
==17265==    by 0xA6781A: ix86_swap_binary_operands_p (i386.c:14395)
==17265==    by 0xA8F448: ix86_binary_operator_ok (i386.c:14534)
==17265==    by 0xDDE88E: recog (i386.md:8432)
==17265==    by 0xECF613: recog_for_combine (combine.c:10165)
==17265==    by 0xEFB8FF: try_combine (combine.c:3012)
==17265==    by 0xF05BE3: rest_of_handle_combine (combine.c:1153)
==17265==    by 0x7BF13B: execute_one_pass (passes.c:1567)
==17265==    by 0x7BF3D4: execute_pass_list (passes.c:1622)
==17265==    by 0x7BF3E6: execute_pass_list (passes.c:1623)
==17265==    by 0x901335: tree_rest_of_compilation (tree-optimize.c:452)
==17265==    by 0xABD765: cgraph_expand_function (cgraphunit.c:1643)
==17265==  Address 0xabababababababab is not stack'd, malloc'd or (recently)
free'd
==17265== 
testcase.c: In function 'foo':
testcase.c:5:1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

-------- testcase.c --------
int
foo (int a, int b)
{
  return (a == 0 && b == 0);
}
----------------------------

Tested revisions:
r163261 - crash
r158969 - crash
r158095 - OK
4.5 r160526 - OK


-- 
           Summary: [4.6 Regression] ICE: SIGSEGV in rtx_equal_p (rtl.c:496)
                    with -O1 -funroll-loops -fnon-call-exceptions
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: zsojka at seznam dot cz
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45327