[all-commits] [llvm/llvm-project] bcba31: [AMDGPU] SelDAG: fix lowering of undefined workite...

[Robert Imschweiler via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bcba3117c057158472af83b36a38e0df0f57f4fc
      https://github.com/llvm/llvm-project/commit/bcba3117c057158472af83b36a38e0df0f57f4fc
  Author: Robert Imschweiler <50044286+ro-i at users.noreply.github.com>
  Date:   2025-02-12 (Wed, 12 Feb 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    A llvm/test/CodeGen/AMDGPU/llvm.amdgcn.workitem.id-unsupported-calling-convention.ll

  Log Message:
  -----------
  [AMDGPU] SelDAG: fix lowering of undefined workitem intrinsics (#126058)

GlobalISel already handles undefined workitem.id.{x,y,z} intrinsics,
SelDAG failed in AMDGPUISelLowering.cpp due to a failed assertion in
`AMDGPUTargetLowering::loadInputValue`: `Arg && "Attempting to load
missing argument"`. This commit changes the behavior of SelDAG to
instead use a zero constant.

This LLVM defect was identified via the AMD Fuzzing project.



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