[PATCH] D117758: [GlobalISel] Change ConstantFoldVectorBinop to return vector of APInt

[Jay Foad via Phabricator via llvm-commits]

foad created this revision.
foad added reviewers: arsenm, aemerson.
Herald added subscribers: kerbowa, hiraditya, rovka, nhaehnle, jvesely.
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Previously it built MIR for the results and returned a Register.

This avoids building constants for earlier elements of the vector if
later elements will fail to fold, and allows CSEMIRBuilder::buildInstr
to avoid unconditionally building a copy from the result.

Use a new helper function MachineIRBuilder::buildBuildVectorConstant
to build a G_BUILD_VECTOR of G_CONSTANTs.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D117758

Files:
  llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
  llvm/include/llvm/CodeGen/GlobalISel/Utils.h
  llvm/lib/CodeGen/GlobalISel/CSEMIRBuilder.cpp
  llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
  llvm/lib/CodeGen/GlobalISel/Utils.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-constant-fold-vector-op.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/irtranslator-getelementptr.ll

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