[PATCH] D134330: [Docs] [HLSL] Add note about PCH support

[Xiang Li via Phabricator via cfe-commits]

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PCH supported for HLSL is added when compile in -cc1 mode using -include-pch for test AST.
This change add some notes about the support of PCH for HLSL.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D134330

Files:
  clang/docs/HLSL/HLSLSupport.rst


Index: clang/docs/HLSL/HLSLSupport.rst
===================================================================
--- clang/docs/HLSL/HLSLSupport.rst
+++ clang/docs/HLSL/HLSLSupport.rst
@@ -89,6 +89,14 @@
 ``ExternalSemaSource`` to lazily complete data types, which is a **huge**
 performance win for HLSL.
 
+In case PCH is include when compile HLSL in cc1 mode, the ``ExternalSemaSource``
+will be a ``MultiplexExternalSemaSource`` which include both the ``PCH`` and
+``HLSLExternalSemaSource``. For Built-in data/templates in PCH are already
+define completed, ``HLSLExternalSemaSource`` will just reuse them.
+If the Built-in data/templates are not define completed,
+``HLSLExternalSemaSource`` will create new decls and use the old decls as
+argument for setPreviousDecl.
+
 CodeGen
 -------
 


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