[all-commits] [llvm/llvm-project] 948a84: [WebAssembly] Recognise EXTEND_HIGH (#123325)

[Sam Parker via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 948a8477c6a966ee8509400d2857706e933f4149
      https://github.com/llvm/llvm-project/commit/948a8477c6a966ee8509400d2857706e933f4149
  Author: Sam Parker <sam.parker at arm.com>
  Date:   2025-02-17 (Mon, 17 Feb 2025)

  Changed paths:
    M llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
    A llvm/test/CodeGen/WebAssembly/extend-shuffles.ll
    M llvm/test/CodeGen/WebAssembly/int-mac-reduction-loops.ll

  Log Message:
  -----------
  [WebAssembly] Recognise EXTEND_HIGH (#123325)

When lowering EXTEND_VECTOR_INREG, check whether the operand is a
shuffle that is moving the top half of a vector into the lower half. If
so, we can EXTEND_HIGH the input to the shuffle instead.



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