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GCC 8/9 Land Fix For "-march=native" Tuning On Modern Intel CPUs

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  • GCC 8/9 Land Fix For "-march=native" Tuning On Modern Intel CPUs

    Phoronix: GCC 8/9 Land Fix For "-march=native" Tuning On Modern Intel CPUs

    The other day we reported on a GCC 8 regression where Skylake and newer CPUs with "-march=native" haven't been performance as optimally as they should be. Fortunately, that patch was quickly landed into the GCC SVN/Git code for GCC 9 as well as back-ported to GCC 8...

    http://www.phoronix.com/scan.php?pag...Native-SKL-Fix

  • #2
    Is LLVM also having this issue?

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    • #3
      Wonder if AMD's Ryzen IPC claims (8% slower than Kaby Lake was it?) was based on GCC. But IIRC they said it was about the same as Haswell/Broadwell, rather than an even bigger IPC difference, so I guess their tests didn't have this problem.

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      • #4
        Originally posted by cl333r View Post
        Is LLVM also having this issue?
        No it won't

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