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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. comex‏ @comex 17 Oct 2018
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      Wow, this is such a cool idea. Translating regular instructions to SIMD instructions in order to run 16 copies of the same program at once, for fuzzing!https://gamozolabs.github.io/fuzzing/2018/10/14/vectorized_emulation.html …

      7 replies 69 retweets 188 likes
      Show this thread
    2. Patrick Walton‏ @pcwalton 18 Oct 2018
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      Replying to @comex @RichFelker

      Yeah, AVX-512 is really powerful. I wonder if the endgame of AVX-512 is using it for their GPU ISA, Larrabee-style.

      0 replies 0 retweets 2 likes
    3. Patrick Walton‏ @pcwalton 18 Oct 2018
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      Replying to @andreasgal @comex @RichFelker

      I’m not sure that they’ll literally share the same *cores* anytime soon. But sharing the same ISA (at least in part) seems reasonable to me. What I was imagining was CPU-like “big” x86 cores and GPU-like “little” x86 cores on the same die sharing a single SIMD ISA.

      1 reply 0 retweets 3 likes
    4. comex‏ @comex 18 Oct 2018
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      Replying to @pcwalton @andreasgal @RichFelker

      Isn’t that pretty much exactly Larrabee though? Larrabee was a separate chip rather than on-die, and its 512-bit instructions were slightly different from AVX-512, but other than that it’s the same idea. I guess a new attempt could be less minimalist wrt graphics-specific HW.

      3 replies 0 retweets 2 likes
    5. Patrick Walton‏ @pcwalton 18 Oct 2018
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      Replying to @comex @andreasgal @RichFelker

      Well, I don’t see the point of having two vector ISAs (Gen) and SIMD (AVX-512) that largely overlap in functionality but are just incompatible, are programmer-exposed, and ship on the same die.

      2 replies 0 retweets 1 like
    6. Gok‏ @Gok 18 Oct 2018
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      Replying to @pcwalton @comex and

      Overlapping and incompatible SIMD on the same die is pretty much what we do with CPUs and GPUs on other chips…

      1 reply 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 18 Oct 2018
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      Replying to @Gok @comex and

      I mean, sure, but is there any good reason for it other than history?

      8:00 PM - 18 Oct 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Patrick Walton‏ @pcwalton 18 Oct 2018
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          Replying to @pcwalton @Gok and

          I admit I’m biased here, given that I may be writing a CPU SIMD version of WebRender and so the idea of sharing code between CPU and GPU is very relevant to me ;)

          1 reply 0 retweets 1 like
        3. Gok‏ @Gok 18 Oct 2018
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          Replying to @pcwalton @comex and

          Maybe for CPUish SIMD it’s helpful to have lots of complications and for GPUish SIMD it’s not worth the silicon?

          1 reply 0 retweets 0 likes
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