[all-commits] [llvm/llvm-project] 11b986: [RISCV] Simplify glue handling logic in performCom...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 11b986522c09521b8e2f65765bfbefb43769d665
      https://github.com/llvm/llvm-project/commit/11b986522c09521b8e2f65765bfbefb43769d665
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2023-07-13 (Thu, 13 Jul 2023)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp

  Log Message:
  -----------
  [RISCV] Simplify glue handling logic in performCombineVMergeAndVOps [nfc]

This is a subset of Luke's D155063.  I'm splitting pieces and landing them in the process of convincing myself all the individual transforms are in fact correct.

In this case, we're simplifying based on the assumption that all of our vmerge operands have mask operands.  This is a fundemental property of a vmerge.