[all-commits] [llvm/llvm-project] e557ad: [WebAssembly] v8i8 mul support (#151145)

[Sam Parker via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e557ad687b82c4e4943bad7d1d6706c4e6dae30f
      https://github.com/llvm/llvm-project/commit/e557ad687b82c4e4943bad7d1d6706c4e6dae30f
  Author: Sam Parker <sam.parker at arm.com>
  Date:   2025-08-27 (Wed, 27 Aug 2025)

  Changed paths:
    M llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
    M llvm/test/CodeGen/WebAssembly/narrow-simd-mul.ll

  Log Message:
  -----------
  [WebAssembly] v8i8 mul support (#151145)

During DAG combine, promote the operands to v8i16 by concanting with an
undef vector and then use extmul_low to perform the mul at i16. Finally,
shuffle the low bytes out of the i16 elements into the result vector.



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