[Bug tree-optimization/77450] New: [5/6/7 Regression] ICE: in verify_ssa, at tree-ssa.c:1016 on very simple code with vectors

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77450

            Bug ID: 77450
           Summary: [5/6/7 Regression] ICE: in verify_ssa, at
                    tree-ssa.c:1016 on very simple code with vectors
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu
             Build: x86_64-pc-linux-gnu

Created attachment 39538
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39538&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc testcase.c
testcase.c: In function 'foo':
testcase.c:7:1: internal compiler error: in verify_ssa, at tree-ssa.c:1016
 }
 ^
0xde3139 verify_ssa(bool, bool)
        /repo/gcc-trunk/gcc/tree-ssa.c:1016
0xac5e25 execute_function_todo
        /repo/gcc-trunk/gcc/passes.c:1971
0xac6c8f do_per_function
        /repo/gcc-trunk/gcc/passes.c:1655
0xac6d06 execute_todo
        /repo/gcc-trunk/gcc/passes.c:2014
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

$ x86_64-pc-linux-gnu-gcc testcase.c -W
testcase.c: In function 'foo':
testcase.c:7:1: internal compiler error: in execute_todo, at passes.c:2009
 }
 ^
0xac6dda execute_todo
        /repo/gcc-trunk/gcc/passes.c:2009
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

$ x86_64-pc-linux-gnu-gcc -v           
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-239934-checking-yes-rtl-df-extra-nographite-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--without-cloog --without-ppl --without-isl --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu
--with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-239934-checking-yes-rtl-df-extra-nographite-amd64
Thread model: posix
gcc version 7.0.0 20160901 (experimental) (GCC) 

Tested revisions:
r239934 - ICE
6-branch r239849 - ICE
5-branch r239848 - ICE
4_9-branch r239063 - ICE
4_8-branch r224828 - ICE
4_7-branch r211571 - OK