[all-commits] [llvm/llvm-project] 53fece: [DAG] FoldConstantArithmetic - allow binop folding...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 53fecef1ec5cb502900f82b07036b28cb0fb9f0f
      https://github.com/llvm/llvm-project/commit/53fecef1ec5cb502900f82b07036b28cb0fb9f0f
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-06-09 (Sun, 09 Jun 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    M llvm/test/CodeGen/ARM/vector-store.ll
    M llvm/test/CodeGen/X86/vshift-6.ll

  Log Message:
  -----------
  [DAG] FoldConstantArithmetic - allow binop folding to work with differing bitcasted constants (#94863)

We currently only constant fold binop(bitcast(c1),bitcast(c2)) if c1 and c2 are both bitcasted and from the same type.

This patch relaxes this assumption to allow the constant build vector to originate from different types (and allow cases where only one operand was bitcasted).

We still ensure we bitcast back to one of the original types if both operand were bitcasted (we assume that if we have a non-bitcasted constant then its legal to keep using that type).



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