[Bug tree-optimization/49822] New: [gcc-4.7 regression] Segfault in remove_prop_source_from_use

[rearnsha at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49822

           Summary: [gcc-4.7 regression] Segfault in
                    remove_prop_source_from_use
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: rearnsha@gcc.gnu.org
            Target: arm-eabi


Created attachment 24815
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24815
testcase

Attached testcase segfaults GCC for arm-eabi when compiled with

cc1 -marm -mcpu=arm7tdmi -Os -fno-short-enums

This was caused by:

2011-07-21  Richard Guenther  <rguenther@suse.de>

        * tree-ssa-forwprop.c (combine_conversions): Return whether
        we have to run cfg-cleanup.  Properly remove dead stmts.
        (ssa_forward_propagate_and_combine): Adjust.