[all-commits] [llvm/llvm-project] 58e1c0: [RISCV] Discard the false operand in vmerge.vvm ->...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 58e1c0e416f4a071482d1d9c2d620c7a0df4cf33
      https://github.com/llvm/llvm-project/commit/58e1c0e416f4a071482d1d9c2d620c7a0df4cf33
  Author: Luke Lau <luke at igalia.com>
  Date:   2024-08-31 (Sat, 31 Aug 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVVectorPeephole.cpp
    M llvm/test/CodeGen/RISCV/rvv/rvv-peephole-vmerge-to-vmv.mir

  Log Message:
  -----------
  [RISCV] Discard the false operand in vmerge.vvm -> vmv.v.v peephole (#106688)

vmerge.vvm needs to have an all ones mask, so nothing is taken from the
false operand. So instead of checking that the passthru is the same as
false, just use the passthru directly for the tail elements.

This supersedes the convertVMergeToVMv part of #105788, as noted in
https://github.com/llvm/llvm-project/pull/105788/files#r1731683971



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