[all-commits] [llvm/llvm-project] bb10fa: AMDGPU: Fix wrong null value for private address s...

[Matt Arsenault via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: bb10fa3a53f928e2e24ad3eaf8e57508fe9d4320
      https://github.com/llvm/llvm-project/commit/bb10fa3a53f928e2e24ad3eaf8e57508fe9d4320
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2020-05-26 (Tue, 26 May 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.h
    M llvm/test/CodeGen/AMDGPU/GlobalISel/inst-select-load-private.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-addrspacecast.mir
    M llvm/test/CodeGen/AMDGPU/addrspacecast.ll
    M llvm/test/CodeGen/AMDGPU/nullptr.ll

  Log Message:
  -----------
  AMDGPU: Fix wrong null value for private address space

I'm guessing this was a holdover from when 0 was an invalid stack
pointer, but surprised nobody has discovered this before.

Also don't allow offset folding for -1 pointers, since it looks weird
to partially fold this.