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* After we see a function can't be removed, deprioritize trying to remove it again (it may just be unremovable).
* Focus on reducing segments exponentially first, before zeroing out what is left (which is not exponential).
This was helpful in reducing a massive sqlite testcase.
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* wasm-reduce tweaks and improvements: better error messages, better validation, better function removal, etc.
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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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* fix wasm-reduce when out-of-tree: do not use a hardcoded bin/wasm-opt, instead add a Path namespace with utilities to get the proper path, and use BINARYEN_ROOT which our test setup code ensures
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flags (#1277)
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The IR is indeed a tree, but not an "abstract syntax tree" since there is no language for which it is the syntax (except in the most trivial and meaningless sense).
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* refactor validator API to use enums
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This makes wasm validation parallel (the function part). This makes loading+validating tanks (a 12MB wasm file) 2.3x faster on a 4-core machine (from 3.5 to 1.5 seconds). It's a big speedup because most of loading+validating was actually validating.
It's also noticeable during compilation, since we validate by default at the end. 8% faster on -O2 and 23% on -O0. So actually fairly significant on -O0 builds.
As a bonus, this PR also moves the code from being 99% in the header to be 1% in the header.
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Reduce an interesting wasm to a smaller still interesting wasm. This takes an arbitrary command to run, and reduces the wasm as much as it can while keeping the behavior of that command fixed. This can be used to reduce compiler bugs in an arbitrary VM, etc.
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