[all-commits] [llvm/llvm-project] bb562d: AMDGPU/GlobalISel: Keep G_BITCAST out of waterfall...

[Matt Arsenault via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: bb562d1af0e9f959eceb8b41cc5530202d55731a
      https://github.com/llvm/llvm-project/commit/bb562d1af0e9f959eceb8b41cc5530202d55731a
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2020-01-22 (Wed, 22 Jan 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/regbankselect-insert-vector-elt.mir

  Log Message:
  -----------
  AMDGPU/GlobalISel: Keep G_BITCAST out of waterfall loop

The waterfall utility function blindly inserts a phi for every def in
the loop. We don't need this one to be preserved for every
iteration. Saves an extra phi and copy inside the loop body.