Don't create indexed load / store with zero offset!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36716 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 5977e88..8396e45 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -3110,6 +3110,10 @@
ISD::MemIndexedMode AM = ISD::UNINDEXED;
if (!TLI.getPreIndexedAddressParts(N, BasePtr, Offset, AM, DAG))
return false;
+ // Don't create a indexed load / store with zero offset.
+ if (isa<ConstantSDNode>(Offset) &&
+ cast<ConstantSDNode>(Offset)->getValue() == 0)
+ return false;
// Try turning it into a pre-indexed load / store except when:
// 1) The base is a frame index.
@@ -3239,6 +3243,10 @@
std::swap(BasePtr, Offset);
if (Ptr != BasePtr)
continue;
+ // Don't create a indexed load / store with zero offset.
+ if (isa<ConstantSDNode>(Offset) &&
+ cast<ConstantSDNode>(Offset)->getValue() == 0)
+ continue;
// Try turning it into a post-indexed load / store except when
// 1) All uses are load / store ops that use it as base ptr.