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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. Hector Martin‏ @marcan42 22 Mar 2016
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      Food for thought: the PS2 (2000) had a 64-bit CPU with 128-bit SIMD, while the Wii U (2012) has a 32-bit CPU with 64-bit SIMD.

      4 replies 32 retweets 41 likes
    2. @js@chaos.social (Jonathan S.)‏ @Midar3 23 Mar 2016
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      Replying to @marcan42

      @marcan42 N64 was 64 bit, too. PS3 was 32 bit again. 64 bit does not necessarily mean faster.

      1 reply 0 retweets 1 like
    3. Hector Martin‏ @marcan42 24 Mar 2016
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      Replying to @Midar3

      @Midar3 PS3 PPU was very much 64-bit, and the Cell SPEs were dedicated 128-bit SIMD processors.

      1 reply 1 retweet 0 likes
    4. Hector Martin‏ @marcan42 24 Mar 2016
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      Replying to @marcan42

      @Midar3 64bit is strictly superior to 32bit (all else being equal), but not by much. However 32bit is often an indicator of a dated design.

      1 reply 1 retweet 0 likes
    5. @js@chaos.social (Jonathan S.)‏ @Midar3 24 Mar 2016
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      Replying to @marcan42

      @marcan42 Well, for PPC at least, PPC64 has no advantage over PPC32 except being able to address more than 4G of RAM…

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 24 Mar 2016
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      Replying to @Midar3

      @Midar3 Huh? PPC64 has 64-bit registers and math. Of course it's an advantage.

      1 reply 0 retweets 0 likes
    7. @js@chaos.social (Jonathan S.)‏ @Midar3 24 Mar 2016
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      Replying to @marcan42

      @marcan42 When do you need 64 bit int math in games? Even in benchmarks there was no noticeable difference between PPC32 and 64 on same CPU

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 24 Mar 2016
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      Replying to @Midar3

      @Midar3 Being able to do 64-bit loads and stores helps, and 64-bit math is useful for well optimized code.

      11:08 AM - 24 Mar 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        1. @js@chaos.social (Jonathan S.)‏ @Midar3 26 Mar 2016
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          Replying to @marcan42

          @marcan42 SIMD loads and stores help way more, same for math. Non-SIMD 64 bit int is basically useless for games.

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 26 Mar 2016
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          Replying to @Midar3

          @Midar3 Yes, but the Wii U also only has 2x32-bit float SIMD, which sucks (and would've made plain 64-bit ints more useful if it had them)

          0 replies 0 retweets 0 likes
          3. End of conversation

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