Do not count debugger intrinsics in size estimation.

[oota-llvm.git] / lib / Transforms / Scalar / TailDuplication.cpp

diff --git a/lib/Transforms/Scalar/TailDuplication.cpp b/lib/Transforms/Scalar/TailDuplication.cpp
index 545068b6dfb977e4718cab8fd1a356dc8c614744..0a05d0f9e72246a6337f391161537cb310e4fe58 100644 (file)
--- a/lib/Transforms/Scalar/TailDuplication.cpp
+++ b/lib/Transforms/Scalar/TailDuplication.cpp
@@ -22,6 +22,7 @@
 #include "llvm/Constant.h"
 #include "llvm/Function.h"
 #include "llvm/Instructions.h"
+#include "llvm/IntrinsicInst.h"
 #include "llvm/Pass.h"
 #include "llvm/Type.h"
 #include "llvm/Support/CFG.h"
@@ -107,8 +108,11 @@ bool TailDup::shouldEliminateUnconditionalBranch(TerminatorInst *TI) {
   BasicBlock::iterator I = Dest->begin();
   while (isa<PHINode>(*I)) ++I;
 
-  for (unsigned Size = 0; I != Dest->end(); ++Size, ++I)
-    if (Size == Threshold) return false;  // The block is too large...
+  for (unsigned Size = 0; I != Dest->end(); ++I) {
+    if (Size == Threshold) return false;  // The block is too large.
+    // Only count instructions that are not debugger intrinsics.
+    if (!isa<DbgInfoIntrinsic>(I)) ++Size;
+  }
 
   // Do not tail duplicate a block that has thousands of successors into a block
   // with a single successor if the block has many other predecessors.  This can