[all-commits] [llvm/llvm-project] b8038a: [WebAssembly] Disable SimplifyDemandedVectorElts a...

[Heejin Ahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b8038a916df29915368a74f7c29bf4ad4e367663
      https://github.com/llvm/llvm-project/commit/b8038a916df29915368a74f7c29bf4ad4e367663
  Author: Heejin Ahn <aheejin at gmail.com>
  Date:   2022-03-16 (Wed, 16 Mar 2022)

  Changed paths:
    M llvm/include/llvm/CodeGen/TargetLowering.h
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
    M llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.h
    A llvm/test/CodeGen/WebAssembly/simd-simplify-demanded-vector-elts.ll

  Log Message:
  -----------
  [WebAssembly] Disable SimplifyDemandedVectorElts after legalization

This fixes a reported bug that caused an infinite loop during the
SelectionDAG optimization phase in ISel, by creating an overridable hook
in `TargetLowering` that allows us to bail out from running
`SimplifyDemandedVectorElts`.

Reviewed By: tlively

Differential Revision: https://reviews.llvm.org/D121869