[all-commits] [llvm/llvm-project] 12409a: [DirectX] Implement `memcpy` in DXIL CBuffer Acces...

[Deric C. via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 12409a18f609f965fbd40aba77a0b50dcdba147f
      https://github.com/llvm/llvm-project/commit/12409a18f609f965fbd40aba77a0b50dcdba147f
  Author: Deric C. <cheung.deric at gmail.com>
  Date:   2025-06-30 (Mon, 30 Jun 2025)

  Changed paths:
    M llvm/lib/Target/DirectX/DXILCBufferAccess.cpp
    A llvm/test/CodeGen/DirectX/CBufferAccess/memcpy.ll

  Log Message:
  -----------
  [DirectX] Implement `memcpy` in DXIL CBuffer Access pass  (#144436)

Fixes #141840

This PR implements support for the `memcpy` intrinsic in the DXIL
CBuffer Access pass with the following restrictions:

- The CBuffer Access must be the `src` operand of `memcpy` and must be
direct (i.e., not a GEP)
- The type of the CBuffer Access must be of an Array Type

These restrictions greatly simplify the implementation of `memcpy` yet
still covers the known uses in DML shaders.

Furthermore, to prevent errors like #141840 from occurring silently
again, this PR adds error reporting for unsupported users of globals in
the DXIL CBuffer Access pass.



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