commit 18d9afb815bd8aff885dd64c5078760b3398d7be
author Ted Kremenek <kremenek@apple.com> Tue Dec 23 18:41:34 2008 +0000
committer Ted Kremenek <kremenek@apple.com> Tue Dec 23 18:41:34 2008 +0000
tree e9ce1d069e39caa5aab098b8c8c9805b940f3553
parent 6b1c9708c8fca3786c766b6d1869721656b31322

PTH: Use 3 bytes instead of 4 bytes to encode the persistent ID for a token.
- This reduces the PTH size for Cocoa.h by 7%.
- The increases PTH -Eonly speed for Cocoa.h by 0.8%.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@61377 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Lex/PTHLexer.cpp

diff --git a/lib/Lex/PTHLexer.cpp b/lib/Lex/PTHLexer.cpp
index dc8f842..b60b915 100644
--- a/lib/Lex/PTHLexer.cpp
+++ b/lib/Lex/PTHLexer.cpp
@@ -26,7 +26,7 @@
 
 using namespace clang;
 
-#define DISK_TOKEN_SIZE (2+4+4+2)
+#define DISK_TOKEN_SIZE (1+1+3+4+2)
 
 //===----------------------------------------------------------------------===//
 // Utility methods for reading from the mmap'ed PTH file.
@@ -69,16 +69,15 @@
     
   uint32_t perID = ((uint32_t) CurPtrShadow[2])
       | (((uint32_t) CurPtrShadow[3]) << 8)
-      | (((uint32_t) CurPtrShadow[4]) << 16)
-      | (((uint32_t) CurPtrShadow[5]) << 24);
+      | (((uint32_t) CurPtrShadow[4]) << 16);
   
-  uint32_t FileOffset = ((uint32_t) CurPtrShadow[6])
-      | (((uint32_t) CurPtrShadow[7]) << 8)
-      | (((uint32_t) CurPtrShadow[8]) << 16)
-      | (((uint32_t) CurPtrShadow[9]) << 24);
+  uint32_t FileOffset = ((uint32_t) CurPtrShadow[5])
+      | (((uint32_t) CurPtrShadow[6]) << 8)
+      | (((uint32_t) CurPtrShadow[7]) << 16)
+      | (((uint32_t) CurPtrShadow[8]) << 24);
   
-  uint32_t Len = ((uint32_t) CurPtrShadow[10])
-      | (((uint32_t) CurPtrShadow[11]) << 8);
+  uint32_t Len = ((uint32_t) CurPtrShadow[9])
+      | (((uint32_t) CurPtrShadow[10]) << 8);
   
   CurPtr = (const char*) (CurPtrShadow + DISK_TOKEN_SIZE);