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* Move more logic to the Literal class. We now leave all the work to there, except for handling traps.
* Avoid switching on the type, then the opcode, then Literal method usually switches on the type again - instead, do one big switch for the opcodes (then the Literal method is unchanged) which is shorter and clearer, and avoids that first switching.
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Stuff like x + 5 != 2 => x != -3.
Also some cleanups of utility functions I noticed while writing this, isTypeFloat => isFloatType.
Inspired by
https://github.com/golang/go/blob/master/src/cmd/compile/internal/ssa/gen/generic.rules
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* rename WasmType to Type. it's in the wasm:: namespace anyhow, and without Wasm- it fits in better alongside Index, Address, Expression, Module, etc.
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Implements #1172: this adds a variant of precompute, "precompute-propagate", which also does constant propagation. Precompute by itself just runs the interpreter on each expression and sees if it is in fact a constant; precompute-propagate also looks at the graph of connections between get and set locals, and propagates those constant values.
This helps with cases as noticed in #1168 - while in most cases LLVM will do this already, it's important when inlining, e.g. inlining of the clamping math functions. This new pass is run when inlining, and otherwise only in -O3/-Oz, as it does increase compilation time noticeably if run on everything (and for almost no benefit if LLVM has run).
Most of the code here is just refactoring out from the ssa pass the get/set graph computation, so it can now be used by both the ssa pass and precompute-propagate.
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A pass that hoists repeating constants to a local, and replaces their uses with a get of that local. This can reduce binary size, but can also *increase* gzip size, so it's mostly for experimentation and not used by default.
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wast2wasm wes recently updated to only support the
former: https://github.com/WebAssembly/wabt/pull/482
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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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