[all-commits] [llvm/llvm-project] 5ca39a: [RISCV] Remove an unnecessary copy of X0 in select...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5ca39a55a7ea383cdf4a557689af741027b0f3db
      https://github.com/llvm/llvm-project/commit/5ca39a55a7ea383cdf4a557689af741027b0f3db
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2022-06-30 (Thu, 30 Jun 2022)

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

  Log Message:
  -----------
  [RISCV] Remove an unnecessary copy of X0 in selectShiftMask.

We know which instruction we're emitting so its ok to directly
encode X0 into the instruction. We only need to create a copy when
a constant 0 is selected without context of what instructions uses it.