https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97808
Bug ID: 97808 Summary: ICE at -Os and above: in clean, at tree-ssa-pre.c:2053 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: --- [514] % 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 20201112 (experimental) [master revision 7ea19dcafb8:c6f488d83fd:5d9ade39b8720b61cf63a8be181fb3b487f6ac5b] (GCC) [515] % [515] % gcctk -O1 -c small.c [516] % [516] % gcctk -Os -c small.c during GIMPLE pass: pre small.c: In function āgā: small.c:5:6: internal compiler error: in clean, at tree-ssa-pre.c:2053 5 | void g() { | ^ 0xed6c52 clean ../../gcc-trunk/gcc/tree-ssa-pre.c:2053 0xedced5 compute_antic ../../gcc-trunk/gcc/tree-ssa-pre.c:2539 0xedeb19 execute ../../gcc-trunk/gcc/tree-ssa-pre.c:4363 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. [517] % [517] % cat small.c int a, e, f; volatile int b; unsigned c, d; void g() { int h = b; d = e; a = -(~h + d); c = d >> (b && f) ^ -~h; }