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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. whitequark‏ @whitequark 28 Dec 2020
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      Replying to @The6P4C

      its also secretly a string

      2 replies 0 retweets 5 likes
    2. the6p4c  🦀 ⚡‏ @The6P4C 28 Dec 2020
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      Replying to @whitequark

      yeah, sadly i did find that one out by looking at the firrtl backend, one of few places CONST_FLAG_REAL appears

      1 reply 0 retweets 0 likes
    3. whitequark‏ @whitequark 28 Dec 2020
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      Replying to @The6P4C

      the real (pun intended) answer is that all of us wish `real` wasn't a thing so it's implemented in the most "just fuck off already" way possible

      1 reply 0 retweets 5 likes
    4. whitequark‏ @whitequark 28 Dec 2020
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      Replying to @whitequark @The6P4C

      there's a bunch of other features that are also like that

      1 reply 0 retweets 2 likes
    5. the6p4c  🦀 ⚡‏ @The6P4C 28 Dec 2020
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      Replying to @whitequark

      `upto` feels like another slightly annoying one

      1 reply 0 retweets 0 likes
    6. whitequark‏ @whitequark 28 Dec 2020
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      Replying to @The6P4C

      fun fact i still don't know what *exact* semantics it implements. i just know it does... something... about the bits

      2 replies 0 retweets 2 likes
    7. the6p4c  🦀 ⚡‏ @The6P4C 28 Dec 2020
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      Replying to @whitequark

      i know i'm "upto" my neck in parsers, that's for sure

      1 reply 0 retweets 4 likes
    8. whitequark‏ @whitequark 28 Dec 2020
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      Replying to @The6P4C

      i mean i know that wire [3:0] is downto and wire [0:3] is upto, but i have no idea what happens if you e.g. connect the two

      1 reply 0 retweets 1 like
    9. whitequark‏ @whitequark 28 Dec 2020
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      Replying to @whitequark @The6P4C

      i suspect what happens is not what you actually want but i don't know what it is

      2 replies 0 retweets 1 like
    10. whitequark‏ @whitequark 28 Dec 2020
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      Replying to @whitequark @The6P4C

      it's probably for that insane "least significant bit is 31" numbering scheme

      1 reply 0 retweets 4 likes
      Hector Martin‏ @marcan42 28 Dec 2020
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      Replying to @whitequark @The6P4C

      IBM says hi. Because they don't go big endian, they go BIG endian. Yes, bits are also packed from the top first. Unused bits are the LSBs.pic.twitter.com/jATuc7kWy4

      2:59 AM - 28 Dec 2020
      • 19 Likes
      • hell writes memory initialization code for fun Adolfo Lorenzo Cristóbal Pérez🇪🇸🇨🇵🇨🇦 Lars Viklund Cheshire Merc Cat Neos_muidt Andy shenki 𓆋
      4 replies 0 retweets 19 likes
        1. New conversation
        1. the6p4c  🦀 ⚡‏ @The6P4C 28 Dec 2020
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          Replying to @marcan42 @whitequark

          bitvecto_rs would like to know your location

          2 replies 0 retweets 4 likes
        2. linked list liker‏ @leftpaddotpy 28 Dec 2020
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          Replying to @The6P4C @marcan42 @whitequark

          Msb0 with big endian go brrrrr

          0 replies 0 retweets 2 likes
          3. End of conversation
        1. whitequark‏ @whitequark 28 Dec 2020
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          Replying to @marcan42 @The6P4C

          yes. fuck IBM in particular.

          0 replies 0 retweets 8 likes
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        3. New conversation
        1. Felix Domke‏ @tmbinc 28 Dec 2020
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          Replying to @marcan42 @whitequark @The6P4C

          Half of understanding rlwinm is being able to count upwards, not downwards.

          1 reply 0 retweets 6 likes
        2. Hector Martin‏ @marcan42 28 Dec 2020
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          Replying to @tmbinc @whitequark @The6P4C

          rlwinm_emu.py ¯\_(ツ)_/¯

          1 reply 0 retweets 4 likes
        3. Show replies
        1. Igor Skochinsky‏ @IgorSkochinsky 28 Dec 2020
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          Replying to @marcan42 @whitequark @The6P4C

          my "favorite" part is Book E, where 32-bit registers use bits 32 to 63

          0 replies 0 retweets 4 likes
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