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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Casey Muratori‏ @cmuratori 25 Mar 2019

      I wish ASAN understood memory page boundaries and masked reads, because it sucks getting people telling you your code fails under ASAN when in fact it is correct code and you have to explain that it is that way on purpose :(

      4 replies 1 retweet 26 likes
    2. Geoff Langdale‏ @geofflangdale 25 Mar 2019
      Replying to @cmuratori

      We wrestled a lot with this in Hyperscan and finally came to the conclusion that you can't be Valgrind/ASAN-dirty even when you're writing correct code. Not if you're a library, anyhow. It's a pain as it has a way of doubling your LOC in SIMD loops. "Oh, and now the dumb bit".

      2 replies 0 retweets 3 likes
    3. Wojciech Muła‏ @pshufb 25 Mar 2019
      Replying to @geofflangdale @cmuratori

      This was the reason we didn't use asan. Our core subsystems (string, formatter) were SIMD-oriented and it wasn't possible to white-list inlined functions. I filled the bug against GCC and they said "nope, we won't enable it".

      1 reply 1 retweet 2 likes
      Casey Muratori‏ @cmuratori 25 Mar 2019
      Replying to @pshufb @geofflangdale

      I wish it was generally considered a serious bug to delegitimize what is objectively the fastest correct code for a platform. There's so much of this now in the C++ space, it's deeply depressing.

      3:00 PM - 25 Mar 2019
      • 2 Retweets
      • 8 Likes
      • Ivan Kovatchev M. Eric DeFazio Jonathan Evraire §çīŤøşHï ŇåĶąýŐbŕÔ purpleposeidon Tom Forsyth Dale Kim Michael O'Connor
      2 replies 2 retweets 8 likes
        1. New conversation
        2. Geoff Langdale‏ @geofflangdale 25 Mar 2019
          Replying to @cmuratori @pshufb

          I'm very much in two minds about this. Reading off the end of a buffer is UB, and while I'm not one of those people who runs around with my dress over my head yelling "UB! UB!" it doesn't seem 100% kosher either. I also don't like the idea of breaking valgrind/asan for other ...

          2 replies 0 retweets 0 likes
        3. Geoff Langdale‏ @geofflangdale 25 Mar 2019
          Replying to @geofflangdale @cmuratori @pshufb

          ... people running my library. If someone wants to, they can structure their code to be 100% green lights with these tools, but if my library breaks that, they enter the fun world of "oh, we're 100% compliant aside from this weird ding from those Hyperscan folks". I'm not in ..

          2 replies 0 retweets 0 likes
        4. Show replies
        1. New conversation
        2. 󠃲‏ @nuopnu 26 Mar 2019
          Replying to @cmuratori @pshufb @geofflangdale

          I guess this stems from their conclusions made looking at the software hacked around to make it work, and businesses. Got to make it future proof, as the history is cyclic and your computers will turn into pumpkins overnight, now running on seednary arithmetic.

          1 reply 0 retweets 0 likes
        3. 󠃲‏ @nuopnu 26 Mar 2019
          Replying to @nuopnu @cmuratori and

          Some concerns are legitimate, like using the high bits for tagged pointers (this assumption can break already on x64). On to handholding they go, instead of providing the evidence for the dangers, and suggesting that maybe you'll do fine with only the lowest bits.

          1 reply 0 retweets 0 likes
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