[all-commits] [llvm/llvm-project] 26777a: [AMDGPU] Adapt GCNRegBankReassign for 16 bit subregs

[Stanislav Mekhanoshin via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 26777ad7a0916ad7853aa9229bb8ec0346c68a61
      https://github.com/llvm/llvm-project/commit/26777ad7a0916ad7853aa9229bb8ec0346c68a61
  Author: Stanislav Mekhanoshin <Stanislav.Mekhanoshin at amd.com>
  Date:   2020-04-28 (Tue, 28 Apr 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/GCNRegBankReassign.cpp
    M llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
    M llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
    M llvm/lib/Target/AMDGPU/SIRegisterInfo.h
    M llvm/test/CodeGen/AMDGPU/regbank-reassign.mir

  Log Message:
  -----------
  [AMDGPU] Adapt GCNRegBankReassign for 16 bit subregs

It allows it not to crash and analyze 16 bit subregs if those
appear in the instructions. At the same time it does not attempt
to reassign these. It still can correctly identify register
banks to let larger registers to be reassigned.

More work will be needed here when real instructions will use
these registers and more tests as well.

Differential Revision: https://reviews.llvm.org/D78772