LoopVectorize: support vectorizing intrinsic calls

- added function to VectorTargetTransformInfo to query cost of intrinsics
- vectorize trivially vectorizable intrinsic calls such as sin, cos, log, etc.

Reviewed by: Nadav

llvm-svn: 169711

1 files changed, 19 insertions, 0 deletions

diff --git a/llvm/lib/Target/TargetTransformImpl.cpp b/llvm/lib/Target/TargetTransformImpl.cpp
index 2df72630bb3..7f9fdfc938f 100644
--- a/llvm/lib/Target/TargetTransformImpl.cpp
+++ b/llvm/lib/Target/TargetTransformImpl.cpp
@@ -347,6 +347,25 @@ VectorTargetTransformImpl::getMemoryOpCost(unsigned Opcode, Type *Src,
 }
 
 unsigned
+VectorTargetTransformImpl::getIntrinsicInstrCost(Intrinsic::ID, Type *RetTy,
+                                                 ArrayRef<Type*> Tys) const {
+  // assume that we need to scalarize this intrinsic.
+  unsigned ScalarizationCost = 0;
+  unsigned ScalarCalls = 1;
+  if (RetTy->isVectorTy()) {
+    ScalarizationCost = getScalarizationOverhead(RetTy, true, false);
+    ScalarCalls = std::max(ScalarCalls, RetTy->getVectorNumElements());
+  }
+  for (unsigned i = 0, ie = Tys.size(); i != ie; ++i) {
+    if (Tys[i]->isVectorTy()) {
+      ScalarizationCost += getScalarizationOverhead(Tys[i], false, true);
+      ScalarCalls = std::max(ScalarCalls, RetTy->getVectorNumElements());
+    }
+  }
+  return ScalarCalls + ScalarizationCost;
+}
+
+unsigned
 VectorTargetTransformImpl::getNumberOfParts(Type *Tp) const {
   std::pair<unsigned, MVT> LT = getTypeLegalizationCost(Tp);
   return LT.first;