[all-commits] [llvm/llvm-project] e027e0: [DAGCombiner] Don't let scalarizeBinOpOfSplats cre...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e027e04f0139126b0a4af3aba0dbb31fdf22ea62
      https://github.com/llvm/llvm-project/commit/e027e04f0139126b0a4af3aba0dbb31fdf22ea62
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2024-08-15 (Thu, 15 Aug 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    A llvm/test/CodeGen/RISCV/rvv/pr104480.ll

  Log Message:
  -----------
  [DAGCombiner] Don't let scalarizeBinOpOfSplats create illegal scalar MULHS/MULHU (#104518)

Type legalization lacks generic support for these operations. They are
normally only created when the type is legal. This scalarization case is
new.

We could update type legalization, but there some corner cases that make
it not straightforward. For example, if the promoted type isn't 2x the
narrow type we need to over promote.

Fixes #104480



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