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parent 5c3784023fcfa608d24364ca11cd688c5805a55e
author Deric C. <cheung.deric@gmail.com> 1747672498 -0700
committer GitHub <noreply@github.com> 1747672498 -0700
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[DirectX] Legalize memcpy (#139173)

Fixes #137188 

This PR legalizes memcpy for DXIL in cases where:
- the src and dst arguments are from Alloca or a GlobalVariable,
- the src and dst are pointers to an ArrayType,
- the array element types of src and dst must be equivalent, and
- the len param is a ConstantInt

These assumptions simplify the legalization and, with the addition of
#138991, covers the currently-known cases of memcpy that appear when
compiling DML shaders.

This PR may be unnecessary if #138788 determines that memset and memcpy
can be eliminated entirely.

---------

Co-authored-by: Finn Plummer <canadienfinn@gmail.com>
Co-authored-by: Greg Roth <grroth@microsoft.com>