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🛤 Multi-value #1146

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jfbastien opened this issue Nov 3, 2017 · 4 comments
Closed

🛤 Multi-value #1146

jfbastien opened this issue Nov 3, 2017 · 4 comments
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@rossberg
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Phase 3: Implementation Phase 🛤 tracking

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@jfbastien
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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 #937, #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
@kripken
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kripken commented Nov 3, 2017

Were any numbers presented about how much this can be used in practice? I think previous notes said something about testing in the wasm backend and elsewhere, to see code size etc. Sorry if I missed it in the notes.

@jfbastien
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@kripken I believe you're asking about WebAssembly/meetings#94

@phreda4
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phreda4 commented Jan 13, 2018

I need this feature for implement a forth compiler to webassembly, without this, I need simulate the stack of parameters.

@WebAssembly WebAssembly locked and limited conversation to collaborators Jan 14, 2018
@binji
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binji commented Oct 16, 2018

Moved to WebAssembly/proposals#19.

@binji binji closed this as completed Oct 16, 2018
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@rossberg rossberg

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@kripken @jfbastien @phreda4 @binji @rossberg @flagxor