https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113102
Bug ID: 113102 Summary: during GIMPLE pass: bitintlower ICE: SIGSEGV with _BitInt() at -O1 or -O2 Product: gcc Version: 14.0 Status: UNCONFIRMED Keywords: ice-on-valid-code Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: zsojka at seznam dot cz CC: jakub at gcc dot gnu.org Target Milestone: --- Host: x86_64-pc-linux-gnu Target: x86_64-pc-linux-gnu Created attachment 56913 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56913&action=edit reduced testcase Thank you for the fixes so far. I am observing SIGSEGV at various places at -O1 and -O2, when using _BitInt(). This happens also with the PR112941#c8 patch applied. Compiler output: $ x86_64-pc-linux-gnu-gcc -O testcase-O1.c -wrapper valgrind,-q testcase-O1.c: In function 'foo2': testcase-O1.c:24:17: warning: division by zero [-Wdiv-by-zero] 24 | bi8 /= x >> 0 / 0; | ^ ==16226== Invalid read of size 2 ==16226== at 0x261843D: (anonymous namespace)::bitint_large_huge::add_cast(tree_node*, tree_node*) (gimple-lower-bitint.cc:1052) ==16226== by 0x2621F90: (anonymous namespace)::bitint_large_huge::handle_cast(tree_node*, tree_node*, tree_node*) (gimple-lower-bitint.cc:1501) ==16226== by 0x261F200: (anonymous namespace)::bitint_large_huge::handle_operand(tree_node*, tree_node*) (gimple-lower-bitint.cc:790) ==16226== by 0x262E269: (anonymous namespace)::bitint_large_huge::lower_shift_stmt(tree_node*, gimple*) (gimple-lower-bitint.cc:3137) ==16226== by 0x2631849: gimple_lower_bitint() (gimple-lower-bitint.cc:6469) ==16226== by 0x13C4D6A: execute_one_pass(opt_pass*) (passes.cc:2646) ==16226== by 0x13C565F: execute_pass_list_1(opt_pass*) (passes.cc:2755) ==16226== by 0x13C5671: execute_pass_list_1(opt_pass*) (passes.cc:2756) ==16226== by 0x13C5698: execute_pass_list(function*, opt_pass*) (passes.cc:2766) ==16226== by 0xFC6085: expand (cgraphunit.cc:1842) ==16226== by 0xFC6085: cgraph_node::expand() (cgraphunit.cc:1795) ==16226== by 0xFC73CA: expand_all_functions (cgraphunit.cc:2025) ==16226== by 0xFC73CA: symbol_table::compile() [clone .part.0] (cgraphunit.cc:2399) ==16226== by 0xFC9F47: compile (cgraphunit.cc:2312) ==16226== by 0xFC9F47: symbol_table::finalize_compilation_unit() (cgraphunit.cc:2584) ==16226== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==16226== during GIMPLE pass: bitintlower testcase-O1.c: In function 'foo0': testcase-O1.c:9:1: internal compiler error: Segmentation fault 9 | foo0(void) | ^~~~ 0x150673f crash_signal /repo/gcc-trunk/gcc/toplev.cc:316 0x261843d add_cast /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:1052 0x2621f90 handle_cast /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:1501 0x261f200 handle_operand /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:790 0x262e269 lower_shift_stmt /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:3137 0x2631849 gimple_lower_bitint /repo/gcc-trunk/gcc/gimple-lower-bitint.cc:6469 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. $ x86_64-pc-linux-gnu-gcc -v Using built-in specs. COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r14-6769-20231221032123-g514ea1df444-checking-yes-rtl-df-extra-nobootstrap-pr112941-mul-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++ --enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra --disable-bootstrap --with-cloog --with-ppl --with-isl --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld --with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch --prefix=/repo/gcc-trunk//binary-trunk-r14-6769-20231221032123-g514ea1df444-checking-yes-rtl-df-extra-nobootstrap-pr112941-mul-amd64 Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 14.0.0 20231221 (experimental) (GCC)