https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110317
--- Comment #1 from Zhendong Su <zhendong.su at inf dot ethz.ch> --- Here is another related reproducer that only needs -fselective-scheduling2. It affects 13.* and later. Compiler Explorer: https://godbolt.org/z/zY7vMh9rj [593] % gcctk -v Using built-in specs. COLLECT_GCC=gcctk COLLECT_LTO_WRAPPER=/local/home/suz/suz-local/software/local/gcc-trunk/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/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 --disable-multilib Thread model: posix Supported LTO compression algorithms: zlib gcc version 14.0.0 20230623 (experimental) [master r14-924-gd709841ae0f] (GCC) [594] % [594] % gcctk -O3 -fselective-scheduling2 small.c during RTL pass: sched2 small.c: In function ‘j’: small.c:17:1: internal compiler error: in move_exprs_to_boundary, at sel-sched.cc:5228 17 | } | ^ 0x7d651c move_exprs_to_boundary ../../gcc-trunk/gcc/sel-sched.cc:5228 0x7d651c schedule_expr_on_boundary ../../gcc-trunk/gcc/sel-sched.cc:5436 0xf8834f fill_insns ../../gcc-trunk/gcc/sel-sched.cc:5578 0xf8834f schedule_on_fences ../../gcc-trunk/gcc/sel-sched.cc:7353 0xf8834f sel_sched_region_2 ../../gcc-trunk/gcc/sel-sched.cc:7491 0xf8a568 sel_sched_region_1 ../../gcc-trunk/gcc/sel-sched.cc:7533 0xf8bb86 sel_sched_region(int) ../../gcc-trunk/gcc/sel-sched.cc:7634 0xf8bb86 sel_sched_region(int) ../../gcc-trunk/gcc/sel-sched.cc:7619 0xf8bd29 run_selective_scheduling() ../../gcc-trunk/gcc/sel-sched.cc:7720 0xf6d42d rest_of_handle_sched2 ../../gcc-trunk/gcc/sched-rgn.cc:3743 0xf6d42d execute ../../gcc-trunk/gcc/sched-rgn.cc:3890 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. [595] % [595] % cat small.c int a, b, *c, d, f, h; int ***volatile e; short g; extern int k(); static void i() { while (1) { if (d && f) while (1) ; h = 1; (a ^= ***e) | (*c ^= (g = (b > 8) << h) && f); } } void j() { if (b && k()) i(); }
