[Bug middle-end/63422] New: [5.0 Regression] ICE in freqs_to_counts_path, at tree-ssa-threadupdate.c:981

["Joost.VandeVondele at mat dot ethz.ch" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63422

            Bug ID: 63422
           Summary: [5.0 Regression] ICE in freqs_to_counts_path, at
                    tree-ssa-threadupdate.c:981
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: Joost.VandeVondele at mat dot ethz.ch

In the one day between r215702 and 215747 trunk started failing to compile CP2K
with '-c -flto=jobserver -fprofile-use '. Several lto instances fail with:

/data/vjoost/gnu/cp2k/cp2k/makefiles/../src/core_ae.F:58:0: internal compiler
error: in freqs_to_counts_path, at tree-ssa-threadupdate.c:988
   SUBROUTINE build_core_ae(matrix_h, matrix_p, force, virial,
calculate_forces, use_virial, nder,&
 ^
0xb4e8c0 freqs_to_counts_path
        ../../gcc/gcc/tree-ssa-threadupdate.c:988
0xb4e8c0 ssa_fix_duplicate_block_edges(redirection_data*, ssa_local_info_t*)
        ../../gcc/gcc/tree-ssa-threadupdate.c:1061
0xb4f018 ssa_fixup_template_block
        ../../gcc/gcc/tree-ssa-threadupdate.c:1301
0xb4f018 traverse_noresize<ssa_local_info_t*, ssa_fixup_template_block>
        ../../gcc/gcc/hash-table.h:942
0xb4f018 traverse<ssa_local_info_t*, ssa_fixup_template_block>
        ../../gcc/gcc/hash-table.h:964
0xb4f018 thread_block_1
        ../../gcc/gcc/tree-ssa-threadupdate.c:1523
0xb4f4e0 thread_block
        ../../gcc/gcc/tree-ssa-threadupdate.c:1560
0xb4fd6e thread_through_all_blocks(bool)
        ../../gcc/gcc/tree-ssa-threadupdate.c:2279
0xbd86ed finalize_jump_threads
        ../../gcc/gcc/tree-vrp.c:9856
0xbd86ed execute_vrp
        ../../gcc/gcc/tree-vrp.c:10010

given the combination of lto and profile-use it will be difficult to generate a
testcase (other than building full cp2k with profile feedback, which is
somewhat involved).