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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. This Tweet is unavailable.
    2. Jacob Christian Munch-Andersen‏ @NoHatCoder 31 Mar 2020
      Replying to @Jonathan_Blow

      @cmuratori About static single assignment. SSA adds in a lot of mov instructions, which are supposed to be optimised away later. But when I look at code generated by one of the big compilers, it is stuffed with superfluous mov instructions. I think that says a lot about SSA.

      1 reply 0 retweets 4 likes
    3. Casey Muratori‏ @cmuratori 1 Apr 2020
      Replying to @NoHatCoder @Jonathan_Blow

      I agree. The fantasy is that you just dump everything into an output stream and then it magically gets cleaned up, but in reality it's not obvious that you can really do that in practice.

      0 replies 0 retweets 8 likes
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    6. russell‏ @rpjohnst 1 Apr 2020
      Replying to @Jonathan_Blow @cmuratori @NoHatCoder

      I'm confused- the "generate+clean up junk" problem is real and huge, but whether you use SSA is orthogonal (on its own it doesn't even *represent* moves) you can generate good SSA directly (e.g. https://link.springer.com/content/pdf/10.1007%2F978-3-642-37051-9_6.pdf … instead of llvm-style mem2reg), *or* bad move-y 3AC

      1 reply 0 retweets 1 like
    7. Casey Muratori‏ @cmuratori 1 Apr 2020
      Replying to @rpjohnst @Jonathan_Blow @NoHatCoder

      Well, it's twitter, so it's hard to discuss, but yet - if you mean "use SSA" to just mean "have an IR that assigns nodes to computed values", sure. But I think Jacob meant "use SSA" as actually generate the SSA version of the code and then start processing it.

      1 reply 0 retweets 0 likes
    8. russell‏ @rpjohnst 1 Apr 2020
      Replying to @cmuratori @Jonathan_Blow @NoHatCoder

      I also meant it as "actually generate the SSA version of the code and then start processing it." The paper I linked is on how to generate a good SSA version of the code directly instead of producing a bunch of garbage along the way.

      1 reply 0 retweets 1 like
    9. Casey Muratori‏ @cmuratori 1 Apr 2020
      Replying to @rpjohnst @Jonathan_Blow @NoHatCoder

      But then that is not SSA code is the point. "Generate a good SSA version of the code" is a non-statement. Generate a _non_ SSA version of the code is what you are doing at that point.

      1 reply 0 retweets 0 likes
      Casey Muratori‏ @cmuratori 1 Apr 2020
      Replying to @cmuratori @rpjohnst and

      (For example, even in the chapter to which you linked, they do not call it "SSA form", they call it "pruned SSA form".)

      5:29 PM - 1 Apr 2020
      1 reply 0 retweets 0 likes
        1. New conversation
        2. russell‏ @rpjohnst 1 Apr 2020
          Replying to @cmuratori @Jonathan_Blow @NoHatCoder

          Pruned SSA *is* SSA. "Pruned" is just a desirable quality for SSA to have. Going from SSA to non-SSA is just register allocation; the chapter is going from source to (pruned, i.e. good) SSA.

          1 reply 0 retweets 0 likes
        3. russell‏ @rpjohnst 1 Apr 2020
          Replying to @rpjohnst @cmuratori and

          In this case, no actual pruning occurs! They are just producing SSA that already has that property.

          1 reply 0 retweets 0 likes
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