https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121115
--- Comment #8 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> --- Created attachment 61944 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61944&action=edit Reduced reproducer Shorter reproducer. The miscompiled function is jl_emit_native_impl(), which is down to 30 lines of code. g++ -mprefer-vector-width=256 -std=c++17 -fno-exceptions -funwind-tables -fno-rtti -Llib -Llib/julia -lLLVM -ljulia-internal -ljulia -Wl,-rpath lib -Wl,-rpath lib/julia -O2 -DMISCOMPILE=1 repro.cpp -w With -DMISCOMPILE=1 the function is compiled with -ftree-partial-pre and the generated executable calls __builtin_trap(). Without it, it compiles fine. Use of -fdump-tree-all shows that it's in the pre pass that the good and bad compilations start to diverge, but I don't know what is legitimate and what is wrong. I hope the reduced test case helps someone else finish debugging.
