[Bug rtl-optimization/49994] New: [4.7 Regression] ICE: in maybe_record_trace_start, at dwarf2cfi.c:2234 with -Os -fsched2-use-superblocks

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49994

           Summary: [4.7 Regression] ICE: in maybe_record_trace_start, at
                    dwarf2cfi.c:2234 with -Os -fsched2-use-superblocks
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: zso...@seznam.cz
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 24926
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24926
reduced testcase

Compiler output:
$ gcc -Os -fsched2-use-superblocks testcase.c
testcase.c: In function 'y':
testcase.c:13:3: internal compiler error: in maybe_record_trace_start, at
dwarf2cfi.c:2234
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r177464 - crash
r173150 - OK