[SLP] Sink debug after checking for matching types/opcode.

Differential Revision: https://reviews.llvm.org/D24090

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280260 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Vectorize/SLPVectorizer.cpp

@@ -3855,8 +3855,6 @@ bool SLPVectorizerPass::tryToVectorizeList(ArrayRef<Value *> VL, BoUpSLP &R,
   if (VL.size() < 2)
     return false;
 
-  DEBUG(dbgs() << "SLP: Vectorizing a list of length = " << VL.size() << ".\n");
-
   // Check that all of the parts are scalar instructions of the same type.
   Instruction *I0 = dyn_cast<Instruction>(VL[0]);
   if (!I0)
@@ -3878,6 +3876,8 @@ bool SLPVectorizerPass::tryToVectorizeList(ArrayRef<Value *> VL, BoUpSLP &R,
       return false;
   }
 
+  DEBUG(dbgs() << "SLP: Vectorizing a list of length = " << VL.size() << ".\n");
+
   bool Changed = false;
 
   // Keep track of values that were deleted by vectorizing in the loop below.