[Bug tree-optimization/45948] New: ICE: SIGSEGV in find_uses_to_rename_use (tree-ssa-loop-manip.c:1242) with -O2 -ftree-loop-distribution

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45948

           Summary: ICE: SIGSEGV in find_uses_to_rename_use
                    (tree-ssa-loop-manip.c:1242) with -O2
                    -ftree-loop-distribution
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


Created attachment 22003
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22003
reduced testcase

Command line:
$ gcc -O2 -ftree-loop-distribution pr45948.c

Related valgrind output:
==6585== Invalid read of size 8
==6585==    at 0x97C679: find_uses_to_rename_use (tree-ssa-loop-manip.c:1242)
==6585==    by 0x97C94F: find_uses_to_rename_bb (tree-ssa-loop-manip.c:284)
==6585==    by 0x97CFED: rewrite_into_loop_closed_ssa
(tree-ssa-loop-manip.c:331)
==6585==    by 0x8F2CF2: distribute_loop (tree-loop-distribution.c:1087)
==6585==    by 0x8F466C: tree_loop_distribution (tree-loop-distribution.c:1208)
==6585==    by 0x7BF35E: execute_one_pass (passes.c:1562)
==6585==    by 0x7BF5F4: execute_pass_list (passes.c:1617)
==6585==    by 0x7BF606: execute_pass_list (passes.c:1618)
==6585==    by 0x7BF606: execute_pass_list (passes.c:1618)
==6585==    by 0x902275: tree_rest_of_compilation (tree-optimize.c:419)
==6585==    by 0xAC4991: cgraph_expand_function (cgraphunit.c:1498)
==6585==    by 0xAC6F29: cgraph_optimize (cgraphunit.c:1557)
==6585==  Address 0x10 is not stack'd, malloc'd or (recently) free'd
==6585== 
pr45948.c: In function 'foo':
pr45948.c:4:1: 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.

Tested revisions:
r165152 - crash