[PATCH] D88031: GlobalISel: Fix truncating shift amount in trunc (shl) combine

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: aemerson, paquette, mkitzan.
Herald added subscribers: kerbowa, hiraditya, rovka, nhaehnle, jvesely.
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arsenm requested review of this revision.
Herald added a subscriber: wdng.

The shift amount type does not necessarily match the result type. This
was inserting a trunc from s32 to s32, which asserted. Just preserve
the original shift amount type which can be legalized later.


https://reviews.llvm.org/D88031

Files:
  llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/combine-trunc.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/combine-trunc-shl.mir

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