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[DirectX][Docs] Add DXILIntrinsicExpansion Pass to DXILArchitecture.rst #86198

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[DirectX][Docs] Add DXILIntrinsicExpansion Pass to DXILArchitecture.rst #86198

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[DirectX][Docs] Update DXILArchitecture documentation
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address pr comments
Mar 22, 2024
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13 changes: 13 additions & 0 deletions llvm/docs/DirectX/DXILArchitecture.rst
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Expand Up @@ -61,6 +61,19 @@ on the utilities described in "Common Code" above in order to share
logic with both the DirectX backend and with Clang's codegen of HLSL
support as much as possible.

The DirectX Intrinsic Expansion Pass
====================================
There are intrinsics that don't map directly to DXIL Ops. In some cases
an intrinsic needs to be expanded to a set of LLVM IR instructions. In
other cases an intrinsic needs modifications to the arguments or return
values of a DXIL Op. The `DXILIntrinsicExpansion` pass handles all
the cases where our intrinsics don't have a one to one mapping. This
pass may also be used when the expansion is specific to DXIL to keep
implementation details out of CodeGen. Finally, there is an expectation
that we maintain vector types through this pass. Therefore, best
practice would be to avoid scalarization in this pass.


The DirectX Backend
===================

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