[Bug c++/67790] New: verify_ssa failed: definition in block 20 follows the use

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67790

            Bug ID: 67790
           Summary: verify_ssa failed: definition in block 20 follows the
                    use
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 36428
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36428&action=edit
C++ source code

For gcc trunk dated 20150930 on x86_64

$ ../results/bin/gcc -O3 --std=c++0x -c bug232.cc
hb-ot-layout.cc: In function ‘void hb_ot_layout_position_finish(hb_font_t*,
hb_buffer_t*)’:
hb-ot-layout.cc:795:1: error: definition in block 20 follows the use
for SSA_NAME: vect__57.4352_121 in statement:
vect__141.4353_119 = -vect__57.4352_121;
hb-ot-layout.cc:795:1: internal compiler error: verify_ssa failed
0xf95f47 verify_ssa(bool, bool)
        ../../src/trunk/gcc/tree-ssa.c:1047
0xc7d445 execute_function_todo
        ../../src/trunk/gcc/passes.c:1969
0xc7e837 do_per_function
        ../../src/trunk/gcc/passes.c:1653
0xc7e837 execute_todo
        ../../src/trunk/gcc/passes.c:2019