[all-commits] [llvm/llvm-project] 068808: AMDGPU: Don't assume call targets are registers

[Matt Arsenault via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 068808d102846d551e683241d0b3b9607b3bdf8d
      https://github.com/llvm/llvm-project/commit/068808d102846d551e683241d0b3b9607b3bdf8d
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2020-07-28 (Tue, 28 Jul 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
    M llvm/test/CodeGen/AMDGPU/call-constant.ll

  Log Message:
  -----------
  AMDGPU: Don't assume call targets are registers

GlobalISel let through a call to null, which would then fold into the
source operand like any other inline immediate. The SelectionDAG
lowering deletes calls to null and undef as a workaround from before
calls were supported. We should probably drop the special handling
case in the DAG lowering now, since the middle end optimizers delete
null calls anyway.