https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120461
Bug ID: 120461
Summary: ICE: in gen_reg_rtx, at emit-rtl.cc:1189 with
-mcpu=xt-c920 -mrvv-vector-bits=zvl
-fzero-call-used-regs=all
Product: gcc
Version: 16.0
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:
$ $ echo 'void foo() {}' | riscv64-unknown-linux-gnu-gcc -mcpu=xt-c920
-mrvv-vector-bits=zvl -fzero-call-used-regs=all -xc -
during RTL pass: zero_call_used_regs
<stdin>: In function 'foo':
<stdin>:1:13: internal compiler error: in gen_reg_rtx, at emit-rtl.cc:1189
0x30b1e41 internal_error(char const*, ...)
/repo/gcc-trunk/gcc/diagnostic-global-context.cc:517
0xf7717b fancy_abort(char const*, int, char const*)
/repo/gcc-trunk/gcc/diagnostic.cc:1803
0xb0dd59 gen_reg_rtx(machine_mode)
/repo/gcc-trunk/gcc/emit-rtl.cc:1189
0x129dd3e copy_to_mode_reg(machine_mode, rtx_def*)
/repo/gcc-trunk/gcc/explow.cc:650
0x15c3da2 maybe_legitimize_operand
/repo/gcc-trunk/gcc/optabs.cc:8040
0x15c3da2 maybe_legitimize_operands(insn_code, unsigned int, unsigned int,
expand_operand*)
/repo/gcc-trunk/gcc/optabs.cc:8183
0x15bfed9 maybe_gen_insn(insn_code, unsigned int, expand_operand*)
/repo/gcc-trunk/gcc/optabs.cc:8202
0x15c4a38 maybe_expand_insn(insn_code, unsigned int, expand_operand*)
/repo/gcc-trunk/gcc/optabs.cc:8257
0x15c4a38 expand_insn(insn_code, unsigned int, expand_operand*)
/repo/gcc-trunk/gcc/optabs.cc:8288
0x1c7e37d riscv_vector::emit_vlmax_insn_lra(unsigned int, unsigned int,
rtx_def**, rtx_def*)
/repo/gcc-trunk/gcc/config/riscv/riscv-v.cc:419
0x1b93efe vector_zero_call_used_regs
/repo/gcc-trunk/gcc/config/riscv/riscv.cc:12018
0x1b93efe riscv_zero_call_used_regs(HARD_REG_SET)
/repo/gcc-trunk/gcc/config/riscv/riscv.cc:12038
0x133d622 gen_call_used_regs_seq
/repo/gcc-trunk/gcc/function.cc:5973
0x133d622 execute
/repo/gcc-trunk/gcc/function.cc:6829
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-20250528154756-r16-937-g0f73ae763c02ad-checking-yes-rtl-df-extra-riscv64/bin/../libexec/gcc/riscv64-unknown-linux-gnu/16.0.0/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-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
--enable-libsanitizer --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-20250528154756-r16-937-g0f73ae763c02ad-checking-yes-rtl-df-extra-riscv64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20250528 (experimental) (GCC)
