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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Howard Chu‏ @hyc_symas 27 Apr 2016
      Replying to @hyc_symas

      @CopperheadSec @RichFelker @landley @johnregehr @kssreeram The CPU caches will nullify it if it was actually a nop anyway.

      2 replies 0 retweets 0 likes
    2. CopperheadOS‏ @CopperheadOS 27 Apr 2016
      Replying to @hyc_symas

      @hyc_symas @RichFelker @landley @johnregehr @kssreeram Few of their fancy optimizations like vectorization would work without this stuff.

      2 replies 0 retweets 0 likes
    3. Howard Chu‏ @hyc_symas 27 Apr 2016
      Replying to @CopperheadOS

      @CopperheadSec @RichFelker @landley @johnregehr @kssreeram Funny that Fortran vectorization works fine without rules like this.

      2 replies 0 retweets 0 likes
    4. CopperheadOS‏ @CopperheadOS 27 Apr 2016
      Replying to @hyc_symas

      @hyc_symas @RichFelker @landley @johnregehr @kssreeram Fortran does have rules like this and it's stricter. It's like restrict by default.

      1 reply 0 retweets 1 like
    5. Howard Chu‏ @hyc_symas 27 Apr 2016
      Replying to @CopperheadOS

      @CopperheadSec @RichFelker @landley @johnregehr @kssreeram Last I checked (ages ago) only loops/arrays got vectorized. There's no reason to

      1 reply 0 retweets 0 likes
    6. Howard Chu‏ @hyc_symas 27 Apr 2016
      Replying to @hyc_symas

      @CopperheadSec @RichFelker @landley @johnregehr @kssreeram break all other pointer usage just for one special case optimization.

      1 reply 0 retweets 1 like
    7. CopperheadOS‏ @CopperheadOS 27 Apr 2016
      Replying to @hyc_symas

      @hyc_symas @RichFelker @landley @johnregehr @kssreeram They vectorize a lot more than that and it's not just that depending on this.

      1 reply 0 retweets 0 likes
    8. CopperheadOS‏ @CopperheadOS 27 Apr 2016
      Replying to @CopperheadOS

      @hyc_symas @RichFelker @landley @johnregehr @kssreeram Most optimization passes beyond simple instruction pattern matching need AA queries.

      1 reply 0 retweets 0 likes
    9. Howard Chu‏ @hyc_symas 27 Apr 2016
      Replying to @CopperheadOS

      @CopperheadSec @RichFelker @landley @johnregehr @kssreeram Ah well. Most optimization and AA didn't exist when I worked on gcc 1.4-2.8.

      1 reply 0 retweets 1 like
    10. Howard Chu‏ @hyc_symas 27 Apr 2016
      Replying to @hyc_symas

      @CopperheadSec @RichFelker @landley @johnregehr @kssreeram Didn't need them to get good perf with RISC or orthogonal ISA like M68K.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 27 Apr 2016
      Replying to @hyc_symas

      @hyc_symas @CopperheadSec @johnregehr @kssreeram If you think any compilers in that era had "good performance" you're delusional.

      8:46 PM - 27 Apr 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 27 Apr 2016
          Replying to @RichFelker

          @hyc_symas @CopperheadSec @johnregehr @kssreeram It was only tolerable because people wrote all the bottlenecks by hand in asm.

          1 reply 0 retweets 0 likes
        3. Howard Chu‏ @hyc_symas 28 Apr 2016
          Replying to @RichFelker

          @RichFelker @CopperheadSec @johnregehr @kssreeram which is still true today.

          1 reply 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker 28 Apr 2016
          Replying to @hyc_symas

          @hyc_symas @CopperheadSec @johnregehr @kssreeram No, these days most asm is cargo-cult nonsense; same performance achievable in clean C.

          1 reply 0 retweets 0 likes
        5. Rich Felker‏ @RichFelker 28 Apr 2016
          Replying to @RichFelker

          @hyc_symas @CopperheadSec @johnregehr @kssreeram If it's not, that's a compiler bug and your time is better spent reporting/fixing it.

          1 reply 0 retweets 1 like
        6. Howard Chu‏ @hyc_symas 28 Apr 2016
          Replying to @RichFelker

          @RichFelker @CopperheadSec @johnregehr @kssreeram e.g. this ought to be a simple 64bit mult, still faster in ASM https://github.com/monero-project/bitmonero/blob/master/src/crypto/slow-hash.c#L719-L751 …

          0 replies 0 retweets 0 likes
        7. End of conversation

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