IfConversion: Don't count branches in # of duplicates.

If the entire blocks match, we would count the branch instructions
toward the number of duplicated instructions. This doesn't match what we
do elsewhere, and was causing a bug.

llvm-svn: 280448

llvm/lib/CodeGen/IfConversion.cpp

@@ -671,7 +671,9 @@ bool IfConverter::CountDuplicatedInstructions(
     std::vector<MachineOperand> PredDefs;
     if (TII->DefinesPredicate(*TIB, PredDefs))
       return false;
-    ++Dups1;
+    // If we get all the way to the branch instructions, don't count them.
+    if (!TIB->isBranch())
+      ++Dups1;
     ++TIB;
     ++FIB;
   }