[Bug tree-optimization/46994] New: [4.6 Regression] ICE: in check_loop_closed_ssa_use, at tree-ssa-loop-manip.c:422 with -fgraphite-identity -fno-tree-dce -ffast-math

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46994

           Summary: [4.6 Regression] ICE: in check_loop_closed_ssa_use, at
                    tree-ssa-loop-manip.c:422 with -fgraphite-identity
                    -fno-tree-dce -ffast-math
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: zso...@seznam.cz
                CC: s...@gcc.gnu.org
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 22802
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22802
reduced testcase (from pr42180.f90)

Compiler output:
$ gcc -O -ffast-math -fgraphite-identity -fno-tree-dce pr46994.f90 
pr46994.f90: In function 'foo':
pr46994.f90:1:0: internal compiler error: in check_loop_closed_ssa_use, at
tree-ssa-loop-manip.c:422
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r167954 - crash
r165699 - OK
4.5 r166509 - OK