Remove temporary object allocation #1033
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When returning a ptr/length for allocations and such wasm-bindgen's generated JS would previously return an array with two elements. It turns out this doesn't optimize well in all engines! (See rustwasm#1031). It looks like we can optimize the array destructuring a bit more, but this is all generated code which doesn't need to be too readable so we can also remove the temporary allocation entirely and just pass the second element of this array through a global instead of the return value. Closes rustwasm#1031
fitzgen
approved these changes
Nov 13, 2018
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When returning a ptr/length for allocations and such wasm-bindgen's
generated JS would previously return an array with two elements. It
turns out this doesn't optimize well in all engines! (See #1031). It
looks like we can optimize the array destructuring a bit more, but this
is all generated code which doesn't need to be too readable so we can
also remove the temporary allocation entirely and just pass the second
element of this array through a global instead of the return value.
Closes #1031