https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114998
Bug ID: 114998 Summary: ICE on valid code at -O3 with "-fno-inline -fno-tree-dce -fno-ipa-cp" on x86_64-linux-gnu: Segmentation fault Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: zhendong.su at inf dot ethz.ch Target Milestone: --- It reproduces for 14.1 and trunk, but not 13.2 and earlier. Compiler Explorer: https://godbolt.org/z/7xjf7EWGs [865] % gcctk -v Using built-in specs. COLLECT_GCC=gcctk COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/15.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-trunk/configure --disable-bootstrap --enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk --enable-sanitizers --enable-languages=c,c++ --disable-werror --enable-multilib Thread model: posix Supported LTO compression algorithms: zlib gcc version 15.0.0 20240507 (experimental) (GCC) [866] % [866] % gcctk -O3 -fno-inline -fno-tree-dce -fno-ipa-cp small.c during GIMPLE pass: ldist small.c: In function ‘main’: small.c:4:5: internal compiler error: Segmentation fault 4 | int main() { | ^~~~ 0x1175773 crash_signal ../../gcc-trunk/gcc/toplev.cc:319 0x7f4aef65008f ??? /build/glibc-e2p3jK/glibc-2.31/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0 0x140bb04 vec<tree_node*, va_gc, vl_embed>::quick_push(tree_node* const&) ../../gcc-trunk/gcc/vec.h:1043 0x140bb04 tree_node** vec_safe_push<tree_node*, va_gc>(vec<tree_node*, va_gc, vl_embed>*&, tree_node* const&) ../../gcc-trunk/gcc/vec.h:835 0x140bb04 release_ssa_name_fn(function*, tree_node*) ../../gcc-trunk/gcc/tree-ssanames.cc:619 0x1249bba release_ssa_name(tree_node*) ../../gcc-trunk/gcc/tree-ssanames.h:124 0x1249bba remove_phi_node(gimple_stmt_iterator*, bool) ../../gcc-trunk/gcc/tree-phinodes.cc:457 0x11bc34e gimple_merge_blocks ../../gcc-trunk/gcc/tree-cfg.cc:2175 0xbf0b63 merge_blocks(basic_block_def*, basic_block_def*) ../../gcc-trunk/gcc/cfghooks.cc:820 0x11cbc29 cleanup_tree_cfg_bb ../../gcc-trunk/gcc/tree-cfgcleanup.cc:791 0x11cd564 cleanup_tree_cfg_noloop ../../gcc-trunk/gcc/tree-cfgcleanup.cc:1122 0x11cd564 cleanup_tree_cfg(unsigned int) ../../gcc-trunk/gcc/tree-cfgcleanup.cc:1205 0x102c29c execute_function_todo ../../gcc-trunk/gcc/passes.cc:2058 0x102cb4e execute_todo ../../gcc-trunk/gcc/passes.cc:2143 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. [867] % [867] % cat small.c short a, d; int b, c, f, g, h, i, j[2], o; void s(char r) {} int main() { int l, m, k, n; if (b) { char p; for (; p >= 0; p--) { int e[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0}; if (j[p]) { int q[1]; i = o; o = q[h]; if (g) n = d; m = 4; for (; m; m--) { if (l) k |= c; if (a) break; } } s(n); f |= b; } } return 0; }