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danluu's profile
Dan Luu
Dan Luu
Dan Luu
@danluu

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Dan Luu

@danluu

https://patreon.com/danluu 

danluu.com
Joined December 2008

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    1. Chris Vest‏ @chvest 13 Dec 2016
      • Report Tweet

      Chris Vest Retweeted whitequark

      Every time I’m reminded of DEC Alpha I wonder about that “dependent loads reordered” –how is that even possible without violating causality?https://twitter.com/whitequark/status/808824867369824257 …

      Chris Vest added,

      whitequark @whitequark
      Replying to @bofh453
      this part pic.twitter.com/iiRPIcyfZS
      1 reply 1 retweet 4 likes
    2. Dan Luu‏ @danluu 14 Dec 2016
      • Report Tweet
      Replying to @chvest

      IMO it's not prima facie unreasonable to allow hardware optimizations like the following across caches/CPUs https://danluu.com/new-cpu-features/ …pic.twitter.com/yymtfuKwPi

      2 replies 1 retweet 1 like
    3. Chris Vest‏ @chvest 14 Dec 2016
      • Report Tweet
      Replying to @danluu

      I can agree with that. I thought that the dependant load reordering was within a single core.

      1 reply 0 retweets 0 likes
    4. Dan Luu‏ @danluu 15 Dec 2016
      • Report Tweet
      Replying to @chvest

      There's an explanation (maybe too detailed) in 5.6.1, but I believe all of this basically falls out from http://danluu.com/alpha-arm.pdf pic.twitter.com/Rk5vZV7eJx

      1 reply 0 retweets 1 like
    5. Chris Vest‏ @chvest 17 Dec 2016
      • Report Tweet
      Replying to @danluu

      isn’t it kind of weird how little software people know about the inner workings of hardware?

      1 reply 0 retweets 0 likes
      Dan Luu‏ @danluu 17 Dec 2016
      • Report Tweet
      Replying to @chvest

      IMO specialization is what lets programmers be productive, but it also causes weird inefficiencies. Same for hardware, though! :-)

      10:14 AM - 17 Dec 2016
      0 replies 0 retweets 0 likes

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