[all-commits] [llvm/llvm-project] 0efbb7: [AMDGPU] should expand ROTL i16 to shifts.

[alex-t via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 0efbb70b719e990fe153373eda5a604344ae36bb
      https://github.com/llvm/llvm-project/commit/0efbb70b719e990fe153373eda5a604344ae36bb
  Author: alex-t <alexander.timofeev at amd.com>
  Date:   2020-09-17 (Thu, 17 Sep 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    M llvm/test/CodeGen/AMDGPU/rotl.ll
    M llvm/test/CodeGen/AMDGPU/rotr.ll

  Log Message:
  -----------
  [AMDGPU] should expand ROTL i16 to shifts.

Instruction combining pass turns library rotl implementation to llvm.fshl.i16.
In the selection dag the intrinsic is turned to ISD::ROTL node that cannot be selected.
Need to expand it to shifts again.

Reviewed By: rampitec, arsenm

Differential Revision: https://reviews.llvm.org/D87618