[DAG] Allow merging of stores of vector loads

Remove restriction disallowing merging of stores vector loads into
larger store of larger vector load.

Reviewers: RKSimon, efriedma, spatel

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D36158

llvm-svn: 309951

1 files changed, 0 insertions, 6 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 35a718e1fbf..937522ea2db 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -12719,12 +12719,6 @@ bool DAGCombiner::MergeConsecutiveStores(StoreSDNode *St) {
   if (!IsConstantSrc && !IsLoadSrc && !IsExtractVecSrc)
     return false;
 
-  // Don't merge vectors into wider vectors if the source data comes from loads.
-  // TODO: This restriction can be lifted by using logic similar to the
-  // ExtractVecSrc case.
-  if (MemVT.isVector() && IsLoadSrc)
-    return false;
-
   SmallVector<MemOpLink, 8> StoreNodes;
   // Find potential store merge candidates by searching through chain sub-DAG
   getStoreMergeCandidates(St, StoreNodes);