[Bug target/108316] New: [13 Regression] ICE in maybe_gen_insn via expand_SCATTER_STORE when vectorizing for SVE

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108316

            Bug ID: 108316
           Summary: [13 Regression] ICE in maybe_gen_insn via
                    expand_SCATTER_STORE when vectorizing for SVE
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: acoplan at gcc dot gnu.org
  Target Milestone: ---

The following appears to be a regression on the trunk:

$ cat t.cc
extern bool a[];
short i;
void f(int b[][3][2]) {
  for (; i; i += 4)
    a[i] = b[0][i] != 0;
}
$ aarch64-none-elf-gcc -c t.cc -march=armv9-a -O2 -fvect-cost-model=unlimited
during RTL pass: expand
t.cc: In function 'void f(int (*)[3][2])':
t.cc:3:6: internal compiler error: in maybe_gen_insn, at optabs.cc:8059
    3 | void f(int b[][3][2]) {
      |      ^
0x105f613 maybe_gen_insn(insn_code, unsigned int, expand_operand*)
        /home/alecop01/toolchain/src/gcc/gcc/optabs.cc:8059
0x105f80e maybe_expand_insn(insn_code, unsigned int, expand_operand*)
        /home/alecop01/toolchain/src/gcc/gcc/optabs.cc:8105
0x105ed93 expand_insn(insn_code, unsigned int, expand_operand*)
        /home/alecop01/toolchain/src/gcc/gcc/optabs.cc:8136
0xead67a expand_scatter_store_optab_fn
        /home/alecop01/toolchain/src/gcc/gcc/internal-fn.cc:3430
0xead8dd expand_SCATTER_STORE
        /home/alecop01/toolchain/src/gcc/gcc/internal-fn.def:137
0xeaddd2 expand_internal_call(internal_fn, gcall*)
        /home/alecop01/toolchain/src/gcc/gcc/internal-fn.cc:4436
0xeaddec expand_internal_call(gcall*)
        /home/alecop01/toolchain/src/gcc/gcc/internal-fn.cc:4444
0xbffbdc expand_call_stmt
        /home/alecop01/toolchain/src/gcc/gcc/cfgexpand.cc:2737
0xbffbdc expand_gimple_stmt_1
        /home/alecop01/toolchain/src/gcc/gcc/cfgexpand.cc:3880
0xbffbdc expand_gimple_stmt
        /home/alecop01/toolchain/src/gcc/gcc/cfgexpand.cc:4044
0xc0916f expand_gimple_basic_block
        /home/alecop01/toolchain/src/gcc/gcc/cfgexpand.cc:6096
0xc0a9b9 execute
        /home/alecop01/toolchain/src/gcc/gcc/cfgexpand.cc:6822
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