https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97725
Bug ID: 97725 Summary: ICE at -Os and above: tree check: expected class ‘type’, have ‘exceptional’ (error_mark) in useless_type_conversion_p, at gimple-expr.c:87 Product: gcc Version: 11.0 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: --- [555] % 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/11.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-trunk/configure --disable-bootstrap --prefix=/local/suz-local/software/local/gcc-trunk --enable-languages=c,c++ --disable-werror --enable-multilib --with-system-zlib Thread model: posix Supported LTO compression algorithms: zlib gcc version 11.0.0 20201105 (experimental) [master revision 8f565d255a3:fff11f1136a:35c125cb6ac47fa97aa5ee22f987a38e63adad08] (GCC) [556] % [556] % gcctk -O1 -c small.c [557] % [557] % gcctk -Os -c small.c during GIMPLE pass: evrp small.c: In function ‘main’: small.c:25:1: internal compiler error: tree check: expected class ‘type’, have ‘exceptional’ (error_mark) in useless_type_conversion_p, at gimple-expr.c:87 25 | } | ^ 0x5fdbc9 tree_class_check_failed(tree_node const*, tree_code_class, char const*, int, char const*) ../../gcc-trunk/gcc/tree.c:9802 0x9bb5c3 tree_class_check(tree_node*, tree_code_class, char const*, int, char const*) ../../gcc-trunk/gcc/tree.h:3436 0x9bb5c3 useless_type_conversion_p(tree_node*, tree_node*) ../../gcc-trunk/gcc/gimple-expr.c:87 0xd514f0 verify_gimple_phi ../../gcc-trunk/gcc/tree-cfg.c:5013 0xd514f0 verify_gimple_in_cfg(function*, bool) ../../gcc-trunk/gcc/tree-cfg.c:5342 0xc0102e execute_function_todo ../../gcc-trunk/gcc/passes.c:2039 0xc01f12 execute_todo ../../gcc-trunk/gcc/passes.c:2093 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions. [558] % [558] % cat small.c int a; unsigned b; int main() { if (a) { goto L1; while (1) while (1) { long e = -1L, g; int f, h, i; L1: a = f; L2: g = e; f = h || g; e = ~(f & b); if (i || g < -1L) { ~(g || 0); break; } goto L2; } } return 0; }