[Bug target/109104] New: [13 Regression] ICE: in gen_reg_rtx, at emit-rtl.cc:1171 with -fzero-call-used-regs=all -march=rv64gv

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109104

            Bug ID: 109104
           Summary: [13 Regression] ICE: in gen_reg_rtx, at
                    emit-rtl.cc:1171 with -fzero-call-used-regs=all
                    -march=rv64gv
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: riscv64-unknown-linux-gnu

Compiler output:
$ cat testcase.c 
void foo(void) {}
$ riscv64-unknown-linux-gnu-gcc -fzero-call-used-regs=all -march=rv64gv
testcase.c 
during RTL pass: zero_call_used_regs
testcase.c: In function 'foo':
testcase.c:1:17: internal compiler error: in gen_reg_rtx, at emit-rtl.cc:1171
    1 | void foo(void) {}
      |                 ^
0x6f9f83 gen_reg_rtx(machine_mode)
        /repo/gcc-trunk/gcc/emit-rtl.cc:1171
0x14ca5d4 emit_vlmax_vsetvl
        /repo/gcc-trunk/gcc/config/riscv/riscv-v.cc:115
0x14ca5d4 emit_pred_op
        /repo/gcc-trunk/gcc/config/riscv/riscv-v.cc:189
0x14ca9e1 riscv_vector::emit_vlmax_op(unsigned int, rtx_def*, rtx_def*,
machine_mode)
        /repo/gcc-trunk/gcc/config/riscv/riscv-v.cc:207
0x14ca9e1 expand_const_vector
        /repo/gcc-trunk/gcc/config/riscv/riscv-v.cc:239
0x14ca9e1 riscv_vector::legitimize_move(rtx_def*, rtx_def*, machine_mode)
        /repo/gcc-trunk/gcc/config/riscv/riscv-v.cc:265
0x19c9500 gen_movvnx2qi(rtx_def*, rtx_def*)
        /repo/gcc-trunk/gcc/config/riscv/vector.md:563
0xcbe9f1 rtx_insn* insn_gen_fn::operator()<rtx_def*, rtx_def*>(rtx_def*,
rtx_def*) const
        /repo/gcc-trunk/gcc/recog.h:407
0xcbe9f1 emit_move_insn_1(rtx_def*, rtx_def*)
        /repo/gcc-trunk/gcc/expr.cc:4172
0xcbee1f emit_move_insn(rtx_def*, rtx_def*)
        /repo/gcc-trunk/gcc/expr.cc:4342
0x109b93b default_zero_call_used_regs(HARD_REG_SET)
        /repo/gcc-trunk/gcc/targhooks.cc:1094
0xd1e4aa gen_call_used_regs_seq
        /repo/gcc-trunk/gcc/function.cc:5950
0xd1e4aa execute
        /repo/gcc-trunk/gcc/function.cc:6744
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

$ riscv64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-riscv64/bin/riscv64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r13-6502-20230306110826-gb83acefb040-checking-yes-rtl-df-extra-riscv64/bin/../libexec/gcc/riscv64-unknown-linux-gnu/13.0.1/lto-wrapper
Target: riscv64-unknown-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-cloog --with-ppl --with-isl --with-isa-spec=2.2
--with-sysroot=/usr/riscv64-unknown-linux-gnu --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=riscv64-unknown-linux-gnu
--with-ld=/usr/bin/riscv64-unknown-linux-gnu-ld
--with-as=/usr/bin/riscv64-unknown-linux-gnu-as --disable-multilib
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r13-6502-20230306110826-gb83acefb040-checking-yes-rtl-df-extra-riscv64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.0.1 20230306 (experimental) (GCC)