[cfe-commits] r40423 - /cfe/trunk/Driver/PrintPreprocessedOutput.cpp

[Chris Lattner]

Author: lattner
Date: Mon Jul 23 01:23:07 2007
New Revision: 40423

URL: http://llvm.org/viewvc/llvm-project?rev=40423&view=rev
Log:
In OutputString, avoid calling memcpy for really tiny strings. 
This speeds up -E on 447.dealII by 5.8%

Modified:
    cfe/trunk/Driver/PrintPreprocessedOutput.cpp

Modified: cfe/trunk/Driver/PrintPreprocessedOutput.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/Driver/PrintPreprocessedOutput.cpp?rev=40423&r1=40422&r2=40423&view=diff

==============================================================================
--- cfe/trunk/Driver/PrintPreprocessedOutput.cpp (original)
+++ cfe/trunk/Driver/PrintPreprocessedOutput.cpp Mon Jul 23 01:23:07 2007
@@ -87,7 +87,20 @@
 #else
   if (OutBufCur+Size >= OutBufEnd)
     FlushBuffer();
-  memcpy(OutBufCur, Ptr, Size);
+  
+  switch (Size) {
+  default: 
+    memcpy(OutBufCur, Ptr, Size);
+    break;
+  case 3:
+    OutBufCur[2] = Ptr[2];
+  case 2:
+    OutBufCur[1] = Ptr[1];
+  case 1:
+    OutBufCur[0] = Ptr[0];
+  case 0:
+    break;
+  }
   OutBufCur += Size;
 #endif
 }