[PATCH] D107417: [AArch64][GlobalISel] Widen G_PHI before clamping it during legalization

[Jessica Paquette via Phabricator via llvm-commits]

paquette created this revision.
paquette added reviewers: aemerson, jroelofs.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls, rovka.
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This allows us to handle weird types like s88; we first widen to s128, then clamp back down to s64.

https://godbolt.org/z/9xqbP46Mz

Also this makes it possible for GISel to legalize the case in pr48188.ll. It now does the same thing as SDAG, although regalloc chooses different registers.


https://reviews.llvm.org/D107417

Files:
  llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/legalize-phi.mir
  llvm/test/CodeGen/AArch64/pr48188.ll

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