commit 337edcdbec05316b407d0d64865c88ff8597d910
author Ted Kremenek <kremenek@apple.com> Thu Feb 12 03:26:59 2009 +0000
committer Ted Kremenek <kremenek@apple.com> Thu Feb 12 03:26:59 2009 +0000
tree c2f9615730330f1f26813c2ffec4a116915802b4
parent 96438f319bb07d9a40564b5e01333f82c0c8a61e

PTH: Cache stat information for files in the PTH file.  Hook up FileManager
 to use this stat information in the PTH file using a 'StatSysCallCache' object.

Performance impact (Cocoa.h, PTH):
- number of stat calls reduces from 1230 to 425
- fsyntax-only: time improves by 4.2% 

We can reduce the number of stat calls to almost zero by caching negative stat
calls and directory stat calls in the PTH file as well.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64353 91177308-0d34-0410-b5e6-96231b3b80d8