Author: Xiang Li Date: 2022-10-07T10:49:21-07:00 New Revision: 6a6f10fd23b2730e2c01051541c5a83f5df9131b
URL: https://github.com/llvm/llvm-project/commit/6a6f10fd23b2730e2c01051541c5a83f5df9131b DIFF: https://github.com/llvm/llvm-project/commit/6a6f10fd23b2730e2c01051541c5a83f5df9131b.diff LOG: [Docs] [HLSL] Add note about PCH support 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. Reviewed By: beanz Differential Revision: https://reviews.llvm.org/D134330 Added: Modified: clang/docs/HLSL/HLSLSupport.rst Removed: ################################################################################ diff --git a/clang/docs/HLSL/HLSLSupport.rst b/clang/docs/HLSL/HLSLSupport.rst index a8c9c09b2e9f8..b091c17fd2a76 100644 --- a/clang/docs/HLSL/HLSLSupport.rst +++ b/clang/docs/HLSL/HLSLSupport.rst @@ -89,6 +89,15 @@ types and built-in templates. Clang is already designed to allow an attached ``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 ------- _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
