[PATCH] D154537: AMDGPU: Fold out sign bit ops on frexp_exp

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
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The sign bit has no impact on the exponent, so strip these away. Saves
on the source modifier encoding cost. I left the GlobalISel handling
until there's a resolution to issue #62628.

We should do this in instcombine too, but legalization should be
introducing more frexps than it currently is where this would occur.


https://reviews.llvm.org/D154537

Files:
  llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
  llvm/test/CodeGen/AMDGPU/llvm.amdgcn.frexp.exp.ll

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