NEW 247454
Reduce aliasing of Wasm::Type type index field 
https://bugs.webkit.org/show_bug.cgi?id=247454
Summary Reduce aliasing of Wasm::Type type index field
David Degazio
Reported 2022-11-03 12:58:47 PDT
The Wasm::Type data structure generated in JavaScriptCore/wasm/generateWasmOpsHeader.py contains a TypeIndex field, which is currently used to store any of the following: - TypeDefinition::invalidIndex, for simple/primitive types - A TypeKind, specifically Funcref or Externref, used to implement those types when typed function references are enabled - A pointer to a TypeDefinition, for compound types like functions or structs We currently lose 7/16 bytes of Wasm::Type to padding, so it'd be nice to use some of that space (or maybe refactor Wasm::Type in general) to separate these values out into other fields or a union type so we aren't reinterpreting this uintptr_t all the time.
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Radar WebKit Bug Importer
Comment 1 2022-11-03 12:59:00 PDT
<rdar://problem/101926680>
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