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GCC 5.0 Doesn't Show Much Difference Yet For AMD's Steamroller

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  • GCC 5.0 Doesn't Show Much Difference Yet For AMD's Steamroller

    Phoronix: GCC 5.0 Doesn't Show Much Difference Yet For AMD's Steamroller

    There's been a lot of AMD APU tests this week on Phoronix with having the newest Kaveri APUs. Our latest APU adventure is seeing how well the GCC performance compares between GCC 4.9 and GCC 4.10, what's expected to become GCC 5.0...

    http://www.phoronix.com/vr.php?view=MTc2NDI

  • #2
    Originally posted by phoronix View Post
    Overall there isn't too much to get excited about with these GCC 4.9 vs. 4.10 compiler benchmarks
    6.5% faster in the 1st benchmark, 7.7% in the 2nd benchmark, 2% faster in the 3rd... not that bad. Only the last benchmark doesn't look that good for GCC-5

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    • #3
      Originally posted by oleid View Post
      6.5% faster in the 1st benchmark, 7.7% in the 2nd benchmark, 2% faster in the 3rd... not that bad. Only the last benchmark doesn't look that good for GCC-5
      Look at the openbenchmarking.org result file, in the article they only showed the graphs that showed wins. Still it's pretty good.

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      • #4
        Also, this was without LTO.

        main attraction of 4.10 is that LTO was to be polished, both WRT to optimisations being done as well as memory useage and CPU time during compilation.

        Had he used LTO and done some profile guided optimisations, preferably with LTO-ed relevant libraires, gain might have been better.

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        • #5
          Originally posted by Brane215 View Post
          Also, this was without LTO.

          main attraction of 4.10 is that LTO was to be polished, both WRT to optimisations being done as well as memory useage and CPU time during compilation.

          Had he used LTO and done some profile guided optimisations, preferably with LTO-ed relevant libraires, gain might have been better.
          LTO, PGO, and HyperZ, any other performance tweaks

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          • #6
            I stopped updating GCC after version 4.7.

            All later releases generate super bloated code which usually runs slower than the one produced using GCC 4.7.4 or GCC 4.5.4.

            I cannot understand where GCC is headed to but hopefully Clang will catch up with GCC and then outstrip it.

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            • #7
              Originally posted by birdie View Post
              I stopped updating GCC after version 4.7.
              looks like you stopped taking your meds

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              • #8
                Originally posted by birdie View Post
                I stopped updating GCC after version 4.7.

                All later releases generate super bloated code which usually runs slower than the one produced using GCC 4.7.4 or GCC 4.5.4.

                I cannot understand where GCC is headed to but hopefully Clang will catch up with GCC and then outstrip it.
                asm intermediate dumps or didn't happen

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                • #9
                  Originally posted by pal666 View Post
                  looks like you stopped taking your meds
                  Pathetic GCC fanb0i.

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                  • #10
                    4.7 branch was closed in June, have you tried to file bug reports for any of the open branches to try and get problems fixed?

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