[all-commits] [llvm/llvm-project] 2b8aae: [GISEL] Add IRTranslation for shufflevector on sca...

[Michael Maitland via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2b8aaef09e2fd0b2a5581e198a73579c6939c717
      https://github.com/llvm/llvm-project/commit/2b8aaef09e2fd0b2a5581e198a73579c6939c717
  Author: Michael Maitland <michaeltmaitland at gmail.com>
  Date:   2024-03-07 (Thu, 07 Mar 2024)

  Changed paths:
    M llvm/docs/GlobalISel/GenericOpcode.rst
    M llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
    M llvm/include/llvm/Support/TargetOpcodes.def
    M llvm/include/llvm/Target/GenericOpcodes.td
    M llvm/lib/CodeGen/GlobalISel/CSEMIRBuilder.cpp
    M llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
    M llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
    M llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
    M llvm/lib/CodeGen/MachineVerifier.cpp
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/legalizer-info-validation.mir
    A llvm/test/CodeGen/RISCV/GlobalISel/irtranslator/shufflevector.ll
    A llvm/test/MachineVerifier/test_g_splat_vector.mir
    M llvm/unittests/CodeGen/GlobalISel/LegalizerHelperTest.cpp
    M llvm/unittests/CodeGen/GlobalISel/PatternMatchTest.cpp

  Log Message:
  -----------
  [GISEL] Add IRTranslation for shufflevector on scalable vector types (#80378)

This patch is stacked on
https://github.com/llvm/llvm-project/pull/80372,
https://github.com/llvm/llvm-project/pull/80307, and
https://github.com/llvm/llvm-project/pull/80306.

ShuffleVector on scalable vector types gets IRTranslate'd to
G_SPLAT_VECTOR since a ShuffleVector that has operates on scalable
vectors is a splat vector where the value of the splat vector is the 0th
element of the first operand, because the index mask operand is the
zeroinitializer (undef and poison are treated as zeroinitializer here).
This is analogous to what happens in SelectionDAG for ShuffleVector.

`buildSplatVector` is renamed to`buildBuildVectorSplatVector`. I did not
make this a separate patch because it would cause problems to revert
that change without reverting this change too.



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