feat(legalizer): add GlobalISel-like legalization framework - #1234
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This adds the basic framework for building legalization passes in the same way as LLVM's GlobalISel. This currently just defines the rule actions needed for G_ADD/G_SUB in the 64-bit RISC-V legalization pass. (Very WIP. Top-level documentation is mostly just copied from LLVM.)
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This is how we could structure our legalization passes to somewhat match LLVM’s GlobalISel approach.
For now, it defines the rule actions needed for
G_ADD/G_SUBin the 64-bit RISC-V legalization pass.WIP, draft opened for Thursday's meeting.
The code surrounding typeIndex has no real use yet, but should make more sense as we add more rules.
The current top-level documentation is mostly copied from LLVM.