[Bug rtl-optimization/48374] New: ICE: in single_succ_edge, at basic-block.h:562 with -fselective-scheduling2 and __builtin_unreachable()

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48374

           Summary: ICE: in single_succ_edge, at basic-block.h:562 with
                    -fselective-scheduling2 and __builtin_unreachable()
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 23824
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23824
reduced testcase

Compiler output:
$ gcc -O -fschedule-insns2 -fsel-sched-pipelining
-fsel-sched-pipelining-outer-loops -fselective-scheduling2 --param
max-sched-extend-regions-iters=100 testcase.c 
testcase.c: In function 'foo':
testcase.c:14:1: internal compiler error: in single_succ_edge, at
basic-block.h:562
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r171735 - crash
4.6 r171597 - crash
4.5 r171597 - crash
4.4 r171597 - doesn't know __builtin_unreachable