SLPVectorizer: Only vectorize intrinsics whose operands are widened equally

The vectorizer only knows how to vectorize intrinics by widening all operands by
the same factor.

Patch by Tyler Nowicki!

llvm-svn: 205855

1 files changed, 4 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index ca55b4d6c90..6a78d756ccc 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -41,6 +41,7 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/Transforms/Utils/VectorUtils.h"
 #include <algorithm>
 #include <map>
 
@@ -949,7 +950,9 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
     case Instruction::Call: {
       // Check if the calls are all to the same vectorizable intrinsic.
       IntrinsicInst *II = dyn_cast<IntrinsicInst>(VL[0]);
-      if (II==NULL) {
+      Intrinsic::ID ID = II ? II->getIntrinsicID() : Intrinsic::not_intrinsic;
+
+      if (!isTriviallyVectorizable(ID)) {
         newTreeEntry(VL, false);
         DEBUG(dbgs() << "SLP: Non-vectorizable call.\n");
         return;