[Bug middle-end/68134] New: vector-of-one-int64_t comparison ICE on aarch64-none-elf

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68134

            Bug ID: 68134
           Summary: vector-of-one-int64_t comparison ICE on
                    aarch64-none-elf
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jgreenhalgh at gcc dot gnu.org
  Target Milestone: ---

Created attachment 36605
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36605&action=edit
Failing testcase

After r229128 I get an ICE at O0 on aarch64 targets when compiling the attached
testcase:

$ gcc random-test.c -O0

In file included from random-test.c:1:0:
..../build-aarch64-none-elf/install/lib/gcc/aarch64-none-elf/6.0.0/include/arm_neon.h:
In function 'foo':
..../build-aarch64-none-elf/install/lib/gcc/aarch64-none-elf/6.0.0/include/arm_neon.h:11941:28:
internal compiler error: in prepare_cmp_insn, at optabs.c:3820
   return (uint64x1_t) (__a == __b);
                            ^
0x996e40 prepare_cmp_insn
        ..../src/gcc/gcc/optabs.c:3820
0x997396 emit_cmp_and_jump_insns(rtx_def*, rtx_def*, rtx_code, rtx_def*,
machine_mode, int, rtx_def*, int)
        ..../src/gcc/gcc/optabs.c:3967
0x72e934 do_compare_rtx_and_jump(rtx_def*, rtx_def*, rtx_code, int,
machine_mode, rtx_def*, rtx_code_label*, rtx_code_label*, int)
        ..../src/gcc/gcc/dojump.c:1149
0x72f52a do_compare_and_jump
        ..../src/gcc/gcc/dojump.c:1228
0x73134f do_jump_1(tree_code, tree_node*, tree_node*, rtx_code_label*,
rtx_code_label*, int)
        ..../src/gcc/gcc/dojump.c:240
0x731c68 jumpifnot_1(tree_code, tree_node*, tree_node*, rtx_code_label*, int)
        ..../src/gcc/gcc/dojump.c:148
0x7c6e47 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
        ..../src/gcc/gcc/expr.c:9030
0x6c5ad9 expand_gimple_stmt_1
        ..../src/gcc/gcc/cfgexpand.c:3617
0x6c5ad9 expand_gimple_stmt
        ..../src/gcc/gcc/cfgexpand.c:3677
0x6c8316 expand_gimple_basic_block
        ..../src/gcc/gcc/cfgexpand.c:5681
0x6cb8c4 execute
        ..../src/gcc/gcc/cfgexpand.c:6293
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