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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. Brian Smith‏ @BRIAN_____ 30 Jan 2016
      Replying to @BRIAN_____

      @johnregehr Never mind, I think I'm wrong. I think, indeed, you cannot do the chunking optimization in strict ISO C, in general.

      2 replies 0 retweets 0 likes
    2. Samuel Neves‏ @sevenps 30 Jan 2016
      Replying to @BRIAN_____

      @BRIAN_____ @johnregehr What precisely is the chunking optimization?

      1 reply 0 retweets 0 likes
    3. John Regehr‏ @johnregehr 30 Jan 2016
      Replying to @sevenps

      @sevenps @BRIAN_____ faster memcpy etc. using 8-byte (or whatever) chunks

      1 reply 0 retweets 0 likes
    4. Samuel Neves‏ @sevenps 30 Jan 2016
      Replying to @johnregehr

      @johnregehr @BRIAN_____ As far as I can tell something like this doesn't violate anything and does what you expect: http://goo.gl/s8RpkT 

      4 replies 0 retweets 3 likes
    5. Alexander Cherepanov‏ @ch3root 1 Feb 2016
      Replying to @sevenps

      @sevenps @johnregehr @BRIAN_____ @RichFelker This only contains the case of similarly misaligned pointers but the approach is interesting.

      1 reply 0 retweets 0 likes
    6. Alexander Cherepanov‏ @ch3root 1 Feb 2016
      Replying to @ch3root

      @sevenps @johnregehr @BRIAN_____ @RichFelker Essentially: 1) use blocks up to 16 bytes due to sse;

      1 reply 0 retweets 0 likes
    7. Alexander Cherepanov‏ @ch3root 1 Feb 2016
      Replying to @ch3root

      @sevenps @johnregehr @BRIAN_____ @RichFelker 2) use byte-by-byte loops for copying blocks;

      1 reply 0 retweets 0 likes
    8. Alexander Cherepanov‏ @ch3root 1 Feb 2016
      Replying to @ch3root

      @sevenps @johnregehr @BRIAN_____ @RichFelker 3) tell the compiler about the alignment of blocks by using __builtin_assume_aligned.

      1 reply 0 retweets 0 likes
    9. Alexander Cherepanov‏ @ch3root 1 Feb 2016
      Replying to @ch3root

      @sevenps @johnregehr @BRIAN_____ @RichFelker I wonder why alignas(16) doesn't work... And "if ((uintptr_t)a % 16 == 0)" doesn't work too.

      2 replies 0 retweets 0 likes
    10. Alexander Cherepanov‏ @ch3root 4 Feb 2016
      Replying to @ch3root

      @sevenps @johnregehr @BRIAN_____ @RichFelker Ok, this works: http://goo.gl/KfgonX 

      1 reply 0 retweets 2 likes
      Rich Felker‏ @RichFelker 4 Feb 2016
      Replying to @ch3root

      @ch3root @sevenps @johnregehr @BRIAN_____ At -Os it makes a bunch of calls to memcpy1...

      2:06 PM - 4 Feb 2016
      2 replies 0 retweets 0 likes
        1. Alexander Cherepanov‏ @ch3root 4 Feb 2016
          Replying to @RichFelker

          @RichFelker @sevenps @johnregehr @BRIAN_____ A separate function is not essential here, you can manually inline memcpy1.

          0 replies 0 retweets 0 likes
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        2. CopperheadOS‏ @CopperheadOS 4 Feb 2016
          Replying to @RichFelker

          @RichFelker @ch3root @sevenps @johnregehr @BRIAN_____ Can use __attribute__((always_inline)) to work around that with GCC and Clang but...

          1 reply 0 retweets 0 likes
        3. CopperheadOS‏ @CopperheadOS 4 Feb 2016
          Replying to @CopperheadOS

          @RichFelker @ch3root @sevenps @johnregehr @BRIAN_____ ... that would defeat the whole goal of sticking to ISO C, can do better otherwise.

          1 reply 0 retweets 0 likes
        4. CopperheadOS‏ @CopperheadOS 4 Feb 2016
          Replying to @CopperheadOS

          @RichFelker @ch3root @sevenps @johnregehr @BRIAN_____ It's silly that -O1 doesn't still doesn't do very conservative cost-based inlining...

          1 reply 0 retweets 0 likes
        5. CopperheadOS‏ @CopperheadOS 4 Feb 2016
          Replying to @CopperheadOS

          @RichFelker @ch3root @sevenps @johnregehr @BRIAN_____ ... and the same thing applies to -Os. Due to this, -O2 often generates smaller code.

          1 reply 0 retweets 0 likes
        6. CopperheadOS‏ @CopperheadOS 4 Feb 2016
          Replying to @CopperheadOS

          @RichFelker @ch3root @sevenps @johnregehr @BRIAN_____ For -Os, the problem is just that their inlining heuristic is way too conservative.

          0 replies 0 retweets 0 likes
        7. End of conversation

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