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馃洡 Multi-value #19

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binji opened this Issue Oct 16, 2018 · 0 comments

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binji commented Oct 16, 2018

This is a tracking issue for a post-MVP feature
It will be updated as the issue progresses.

Topic Multi-value
Champion Andreas Rossberg @rossberg
Status in progress
Phase Implementation phase
Linked issues WebAssembly/design#937, WebAssembly/design#667,
Linked repositories github.com/WebAssembly/multi-value)

Details

  • Multiple return values for functions:

    • enable unboxing of tuples or structs returned by value
    • efficient compilation of multiple return values
  • Multiple results for instructions:

    • enable instructions producing several results (divmod, arithmetics with carry)
  • Inputs to blocks:

    • loop labels can have arguments
    • can represent phis on backward edges
    • enable future pick operator to cross block boundary
    • macro definability of instructons with inputs
      • i32.select3 = dup if ... else ... end

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