[all-commits] [llvm/llvm-project] 976f3b: [AMDGPU] Only allow implicit WQM in pixel shaders

[Carl Ritson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 976f3b3c9eba0835d5ab7d191bd2e88ceda86ebe
      https://github.com/llvm/llvm-project/commit/976f3b3c9eba0835d5ab7d191bd2e88ceda86ebe
  Author: Carl Ritson <carl.ritson at amd.com>
  Date:   2021-11-24 (Wed, 24 Nov 2021)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIWholeQuadMode.cpp
    M llvm/test/CodeGen/AMDGPU/memory_clause.ll
    M llvm/test/CodeGen/AMDGPU/vgpr-tuple-allocation.ll
    M llvm/test/CodeGen/AMDGPU/wqm.mir

  Log Message:
  -----------
  [AMDGPU] Only allow implicit WQM in pixel shaders

Implicit derivatives are only valid in pixel shaders,
hence only implicitly enable WQM for pixel shaders.
This avoids unintended WQM in other shader types (e.g. compute)
when image sampling instructions are used.

Reviewed By: rampitec

Differential Revision: https://reviews.llvm.org/D114414