https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117033
--- Comment #8 from Davide Italiano <dccitaliano at gmail dot com> --- (In reply to Andrew Pinski from comment #7) > (In reply to Davide Italiano from comment #6) > > I noticed you linked the LLVM bug I found. > > As part of my search/analysis, I found out there are cases that sometimes > > clang gets but GCC doesn't (unsurprisingly, FWIW). > > > > Here's a simple one. > > https://godbolt.org/z/fjjzf9xds > > here is a slightly modified example which shows the opposite way, GCC > figures it at -Os but LLVM does not: > ``` > long patatino() { > long x = 0; > for (int i = 0; i < 5; ++i) { > if (x < 10) > while (x < 10) { > x += 1; > } > } > return x; > } > ``` Yes, indeed. I found example that go both way. From what I see, FWIW, but I'm still very early in my investigation, GCC's -Oz outperforms LLVM's -Oz on many cases.
