https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121531
Bug ID: 121531 Summary: [16 Regression] ICE: in riscv_sched_variable_issue, at config/riscv/riscv.cc:10190 with -Os -mcpu=sifive-p670 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 Created attachment 62109 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62109&action=edit reduced testcase Compiler output: $ riscv64-unknown-linux-gnu-gcc -Os -mcpu=sifive-p670 testcase.c during RTL pass: sched2 testcase.c: In function 'foo': testcase.c:2:22: internal compiler error: in riscv_sched_variable_issue, at config/riscv/riscv.cc:10190 2 | void foo() { v &= 1; } | ^ 0x3263ab1 internal_error(char const*, ...) /repo/gcc-trunk/gcc/diagnostic-global-context.cc:534 0x101e91d fancy_abort(char const*, int, char const*) /repo/gcc-trunk/gcc/diagnostics/context.cc:1687 0xcc4353 riscv_sched_variable_issue /repo/gcc-trunk/gcc/config/riscv/riscv.cc:10190 0xcc4353 riscv_sched_variable_issue /repo/gcc-trunk/gcc/config/riscv/riscv.cc:10170 0x2fe8d48 schedule_block(basic_block_def**, void*) /repo/gcc-trunk/gcc/haifa-sched.cc:6928 0x17cf1ba schedule_region /repo/gcc-trunk/gcc/sched-rgn.cc:3213 0x17cf1ba schedule_insns() /repo/gcc-trunk/gcc/sched-rgn.cc:3535 0x17cf64d schedule_insns() /repo/gcc-trunk/gcc/sched-rgn.cc:3521 0x17cf64d rest_of_handle_sched2 /repo/gcc-trunk/gcc/sched-rgn.cc:3759 0x17cf64d execute /repo/gcc-trunk/gcc/sched-rgn.cc:3898 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-20250813051928-r16-3177-gd94178d9b3fb1c-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 --enable-libsanitizer --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-20250813051928-r16-3177-gd94178d9b3fb1c-checking-yes-rtl-df-extra-riscv64 Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 16.0.0 20250813 (experimental) (GCC)