[Bug tree-optimization/64728] New: internal compiler error: SSA corruption

["mpolacek at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64728

            Bug ID: 64728
           Summary: internal compiler error: SSA corruption
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org

Created attachment 34528
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34528&action=edit
preprocessed source

$ ./cc1 -quiet -O x.i -o /dev/null 

Unable to coalesce ssa_names 158 and 160 which are marked as MUST COALESCE.
start_position_158(ab) and  start_position_160(ab)
src/openslide-vendor-hamamatsu.c: In function âread_from_jpegâ:
src/openslide-vendor-hamamatsu.c:599:11: internal compiler error: SSA
corruption
0xe31965 fail_abnormal_edge_coalesce
    /home/marek/src/gcc/gcc/tree-ssa-coalesce.c:927
0xe32950 coalesce_partitions
    /home/marek/src/gcc/gcc/tree-ssa-coalesce.c:1225
0xe3301a coalesce_ssa_name()
    /home/marek/src/gcc/gcc/tree-ssa-coalesce.c:1370
0xdb8a08 remove_ssa_form
    /home/marek/src/gcc/gcc/tree-outof-ssa.c:1018
0xdb9318 rewrite_out_of_ssa(ssaexpand*)
    /home/marek/src/gcc/gcc/tree-outof-ssa.c:1252
0x7edd69 execute
    /home/marek/src/gcc/gcc/cfgexpand.c:5817
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