[PATCH] D67050: AMDGPU/GlobalISel: Legalize G_BUILD_VECTOR_TRUNC

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: tstellar, nhaehnle, kerbowa.
Herald added subscribers: Petar.Avramovic, t-tye, tpr, dstuttard, rovka, yaxunl, wdng, jvesely, kzhuravl.

Treat this as legal on gfx9 since it can use S_PACK_* instructions for
this.

      

This isn't used by anything yet. The same will probably apply to
16-bit G_BUILD_VECTOR without the trunc.


https://reviews.llvm.org/D67050

Files:
  lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
  lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
  lib/Target/AMDGPU/AMDGPUSubtarget.h
  test/CodeGen/AMDGPU/GlobalISel/legalize-build-vector-trunc.mir
  test/CodeGen/AMDGPU/GlobalISel/regbankselect-build-vector-trunc.mir

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