https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98868
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- First of call I can reproduce no runtime difference on a Zen2 machine. We do get a lot better ranges after the change (that was the purpose). For example -_490: [-INF, +INF] -_491: [-INF, 2147483646] +_490: [-INF, 512] +_491: [-INF, 511] ... -_63: [-INF, +INF] -_64: [-INF, 2147483646] +_63: [2, +INF] +_64: [1, 2147483646] which means we likely get more jump threading done which may result in code layout changes. Moving the binaries to a zen1 machine does not reproduce the issue either. I can't see the specified jump in the graph either.
