[all-commits] [llvm/llvm-project] 7c6f59: [PowerPC] comment for different input register cla...

[Chen Zheng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7c6f5950f08d41017536575152fb765ba85a09a1
      https://github.com/llvm/llvm-project/commit/7c6f5950f08d41017536575152fb765ba85a09a1
  Author: Chen Zheng <czhengsz at cn.ibm.com>
  Date:   2021-11-08 (Mon, 08 Nov 2021)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCInstrVSX.td

  Log Message:
  -----------
  [PowerPC] comment for different input register classes; nfc

Add comments to explain why XXPERMDIs and XXPERMDI have different input register
classes, vsfrc for XXPERMDIs and vsrc for XXPERMDI.

This addresses the comments in abandoned patch D113178, we keep using `f0` instead
of using `vs0` for XXPERMDIs on purpose.