https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125366
--- Comment #18 from Michal Kowalewski <m.kowalewski at outlook dot com> --- (In reply to Sam James from comment #14) > (In reply to Michal Kowalewski from comment #12) > > compare-lto still fails, and the files seem identical (since I've already > > built them with stripped with -s). I also tried bootstrapping with the same > > flags on another machine with AMD 7950X where -march=native expands to > > znver4, and surprisingly, more objects failed the comparison: > > > > ... > > > > So the -march switch does affect this bug. I am including gimple-match-5 > > objects from the zen 4 build. > > Could you please pick the smallest of the relevant objects, then for the > matching command lines, share those, then run one of them with -save-temps, > and upload xyz.ii for preprocessed source? > > You can then try whittle down which flag causes a difference too when both > are built with the same flags. I rebuilt everything with -g0 on both alderlake and zen 4, and the results are rather surprising. All but gimple-match-6 diffs have disappeared. I have included stage2 and stage3 objects, with preprocessed sources as split 7z archive (due to size). All artifacts are from my znver4 build. So disabling debug info does indeed affect this bug, however gimple-match-6.o still remains. All sources were compiled with "-O3 -march=znver4 -flto -flto-partition=none -ftrivial-auto-var-init=uninitialized -fgraphite-identity -floop-nest-optimize -fno-semantic-interposition -fno-plt -s -fno-ident -fno-asynchronous-unwind-tables -g0"
