[Bug tree-optimization/48134] New: [4.6/4.7 Regression] ICE: in refs_may_alias_p_1, at tree-ssa-alias.c:1085 with custom flags

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48134

           Summary: [4.6/4.7 Regression] ICE: in refs_may_alias_p_1, at
                    tree-ssa-alias.c:1085 with custom flags
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: zso...@seznam.cz
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 23663
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23663
reduced testcase (from gcc.dg/pr19633-1.c)

Maybe similiar to PR47283.

Compiler output:
$ gcc -O2 -fstack-check=specific -fno-tree-dse -fno-tree-fre
-fno-tree-loop-optimize -g testcase.c
testcase.c: In function 'foo':
testcase.c:26:1: internal compiler error: in refs_may_alias_p_1, at
tree-ssa-alias.c:1085
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r170964 - crash
4.6 r170955 - crash
4.5 r170955 - OK