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

[Xiang Li via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG6a6f10fd23b2: [Docs] [HLSL] Add note about PCH support (authored by python3kgae).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D134330/new/

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 +89,15 @@
 ``ExternalSemaSource`` to lazily complete data types, which is a **huge**
 performance win for HLSL.
 
+If precompiled headers are used when compiling HLSL, the ``ExternalSemaSource``
+will be a ``MultiplexExternalSemaSource`` which includes both the ``ASTReader``
+and ``HLSLExternalSemaSource``. For Built-in declarations that are already
+completed in the serialized AST, the ``HLSLExternalSemaSource`` will reuse the
+existing declarations and not introduce new declarations. If the built-in types
+are not completed in the serialized AST, the ``HLSLExternalSemaSource`` will
+create new declarations and connect the de-serialized decls as the previous
+declaration.
+
 CodeGen
 -------
 


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