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Adds a pass that folds code, i.e. merges it when possible. See details in comment in the pass implementation cpp.
This is enabled by default in -Os and -Oz. Seems risky to enable anywhere else, as it does add branches - likely predictable ones so maybe no slowdown, but still some risk.
Code size numbers:
wasm-backend: 196331
+ binaryen -Os (before): 182598
+ binaryen -Os (with folding): 181943
asm2wasm -Os (before): 172463
asm2wasm -Os (with folding): 168774
So this reduces wasm-backend output by an additional 0.5% than it could before. Mainly this is because the wasm backend already has code folding, whereas on asm2wasm output, where we didn't have folding before, this saves over 2%. The 0.5% improvement on the wasm backend's output might be because this can fold more types of code than LLVM can (it can fold nested control flow, in particular).
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* Move WasmType function implementations to wasm.cpp
* Move Literal methods to wasm.cpp
* Reorder wasm.cpp shared constants back to top
* Move expression functions to wasm.cpp
* Finish moving things to wasm.cpp
* Split out Literal into its own .h/.cpp. Also factor out common wasm-type module
* Remove unneeded/transitive includes from wasm.h
* Add comment to try/check methods
* Rename tryX/checkX methods to getXOrNull
* Add missing include that should fix appveyor build breakage
* More appveyor
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due to linker dead code elimination. Fixes #577.
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names are kept on the Function object (#354)
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locals. preparation for #336 (#349)
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This applies Apache 2.0 properly (as far as our lawyers have told me). We can do this early since all of the code was written by Alon Zakai.
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