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I failed to mention it originally, but updated the post with this: it's worth noting that comparing GCC+PGO vs. clang+LTO or GCC+PGO vs. clang+PGO was a win for

I failed to mention it originally, but updated the post with this: it's worth noting that comparing GCC+PGO vs. clang+LTO or GCC+PGO vs. clang+PGO was a win for clang overall in both cases, although GCC was winning on a few benchmarks. If I remember correctly, clang without PGO/LTO was also winning against GCC without PGO.

kasabali 8y ago
But that's still with an ancient GCC version compared to a newer Clang, right?
- anfilt 8y ago
  I would not say ancient, but yea GCC 6 is getting old. I know GCC has had additional optimizations added since then. Although, I am curious how GCC 7+ was breaking binary compatibility? Calling convention, name mangling what?
  - glandium 8y ago
    Using symbols from newer libgcc and libstdc++.