[docs] The stat cache has been removed from the PCH, update the docs to remove mentio...

llvm-svn: 175109

diff --git a/clang/docs/PCHInternals.rst b/clang/docs/PCHInternals.rst
index 6fe53d931631c6f396de4d8af307c8223a1e9c15..a36e65c199c63b23af35539536891962d5cbbccd 100644 (file)
--- a/clang/docs/PCHInternals.rst
+++ b/clang/docs/PCHInternals.rst
@@ -92,9 +92,7 @@ the actual precompiled header is required:
 
 .. code-block:: none
 
-  *** PCH Statistics:
-    933 stat cache hits
-    4 stat cache misses
+  *** AST File Statistics:
     895/39981 source location entries read (2.238563%)
     19/15315 types read (0.124061%)
     20/82685 declarations read (0.024188%)
@@ -214,10 +212,7 @@ The source manager block also contains information about all of the headers
 that were included when building the AST file.  This includes information about
 the controlling macro for the header (e.g., when the preprocessor identified
 that the contents of the header dependent on a macro like
-``LLVM_CLANG_SOURCEMANAGER_H``) along with a cached version of the results of
-the ``stat()`` system calls performed when building the AST file.  The latter
-is particularly useful in reducing system time when searching for include
-files.
+``LLVM_CLANG_SOURCEMANAGER_H``).
 
 .. _pchinternals-preprocessor:
 
@@ -425,10 +420,6 @@ file, inherits from all of these abstract classes to provide lazy
 deserialization of Clang's data structures.  ``ASTReader`` implements the
 following abstract classes:
 
-``StatSysCallCache``
-  This abstract interface is associated with the ``FileManager`` class, and is
-  used whenever the file manager is going to perform a ``stat()`` system call.
-
 ``ExternalSLocEntrySource``
   This abstract interface is associated with the ``SourceManager`` class, and
   is used whenever the :ref:`source manager <pchinternals-sourcemgr>` needs to

diff --git a/clang/docs/UsersManual.rst b/clang/docs/UsersManual.rst
index 75fc3bbc38e30be1092db4c9e9fe47a193c72e81..f82b34b287618e36e5d86eb088cb9943f397327b 100644 (file)
--- a/clang/docs/UsersManual.rst
+++ b/clang/docs/UsersManual.rst
@@ -820,12 +820,7 @@ example, :option:`-isysroot /Developer/SDKs/MacOSX10.4u.sdk` will look for
 Relocatable precompiled headers are intended to be used in a limited
 number of cases where the compilation environment is tightly controlled
 and the precompiled header cannot be generated after headers have been
-installed. Relocatable precompiled headers also have some performance
-impact, because the difference in location between the header locations
-at PCH build time vs. at the time of PCH use requires one of the PCH
-optimizations, ``stat()`` caching, to be disabled. However, this change
-is only likely to affect PCH files that reference a large number of
-headers.
+installed.
 
 Controlling Code Generation
 ---------------------------