Avoid calling getSpelling at all for identifiers, which are

trivial to handle and very very common.  This speeds up -E on 
447.dealII by 2.5%


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@40422 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 1 deletions

diff --git a/Driver/PrintPreprocessedOutput.cpp b/Driver/PrintPreprocessedOutput.cpp
index a7d55df34b..d1f1cef985 100644
--- a/Driver/PrintPreprocessedOutput.cpp
+++ b/Driver/PrintPreprocessedOutput.cpp
@@ -517,7 +517,11 @@ void clang::DoPrintPreprocessedInput(unsigned MainFileID, Preprocessor &PP,
       OutputChar(' ');
     }
     
-    if (Tok.getLength() < 256) {
+    if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
+      const char *Str = II->getName();
+      unsigned Len = Tok.needsCleaning() ? strlen(Str) : Tok.getLength();
+      OutputString(Str, Len);
+    } else if (Tok.getLength() < 256) {
       const char *TokPtr = Buffer;
       unsigned Len = PP.getSpelling(Tok, TokPtr);
       OutputString(TokPtr, Len);