[all-commits] [llvm/llvm-project] b3fb40: [AMDGPU] Fix for folding v2.16 literals.

[Daniil Fukalov via All-commits]

  Branch: refs/heads/release/11.x
  Home:   https://github.com/llvm/llvm-project
  Commit: b3fb40b3a3c1fb7ac094eda50762624baad37552
      https://github.com/llvm/llvm-project/commit/b3fb40b3a3c1fb7ac094eda50762624baad37552
  Author: dfukalov <daniil.fukalov at amd.com>
  Date:   2020-09-14 (Mon, 14 Sep 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
    M llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
    M llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
    M llvm/test/CodeGen/AMDGPU/shrink-add-sub-constant.ll

  Log Message:
  -----------
  [AMDGPU] Fix for folding v2.16 literals.

It was found some packed immediate operands (e.g. `<half 1.0, half 2.0>`) are
incorrectly processed so one of two packed values were lost.

Introduced new function to check immediate 32-bit operand can be folded.
Converted condition about current op_sel flags value to fall-through.

Fixes: SWDEV-247595

Reviewed By: rampitec

Differential Revision: https://reviews.llvm.org/D87158

(cherry picked from commit d03c4034dc80c944ec4a5833ba8f87d60183f866)