[all-commits] [llvm/llvm-project] 987b9e: [DirectX] NonUniformResourceIndex lowering

[Helena Kotas via All-commits]

  Branch: refs/heads/users/hekota/pr159608-nuri-backend
  Home:   https://github.com/llvm/llvm-project
  Commit: 987b9e121700fb578db4cbb8112f932628c9fa42
      https://github.com/llvm/llvm-project/commit/987b9e121700fb578db4cbb8112f932628c9fa42
  Author: Helena Kotas <hekotas at microsoft.com>
  Date:   2025-09-18 (Thu, 18 Sep 2025)

  Changed paths:
    M llvm/include/llvm/IR/IntrinsicsDirectX.td
    M llvm/include/llvm/IR/IntrinsicsSPIRV.td
    M llvm/lib/Target/DirectX/DXILOpLowering.cpp
    A llvm/test/CodeGen/DirectX/CreateHandle-NURI.ll
    A llvm/test/CodeGen/DirectX/CreateHandleFromBinding-NURI.ll

  Log Message:
  -----------
  [DirectX] NonUniformResourceIndex lowering

Introduces `llvm.{dx|svp}.resource.nonuniformindex` intrinsic that will be used when a resource index is not guaranteed to be uniform across threads (HLSL function NonUniformResourceIndex).

The DXIL lowering layer looks for this intrinsic call in the resource index calculation, makes sure it is reflected in the NonUniform flag on DXIL create handle ops (`dx.op.createHandle` and `dx.op.createHandleFromBinding`), and then removes it from the module.

Closes #155701



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