[X86] Preserve memory refs when folding loads into divides.

This is similar to what we already do for multiplies. Without this we can't unfold and hoist an invariant load.

llvm-svn: 317732

1 files changed, 5 insertions, 1 deletions

diff --git a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
index 21fee9a91e0..099543240ae 100644
--- a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -2885,11 +2885,15 @@ void X86DAGToDAGISel::Select(SDNode *Node) {
     if (foldedLoad) {
       SDValue Ops[] = { Tmp0, Tmp1, Tmp2, Tmp3, Tmp4, N1.getOperand(0),
                         InFlag };
-      SDNode *CNode =
+      MachineSDNode *CNode =
         CurDAG->getMachineNode(MOpc, dl, MVT::Other, MVT::Glue, Ops);
       InFlag = SDValue(CNode, 1);
       // Update the chain.
       ReplaceUses(N1.getValue(1), SDValue(CNode, 0));
+      // Record the mem-refs
+      MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1);
+      MemOp[0] = cast<LoadSDNode>(N1)->getMemOperand();
+      CNode->setMemRefs(MemOp, MemOp + 1);
     } else {
       InFlag =
         SDValue(CurDAG->getMachineNode(Opc, dl, MVT::Glue, N1, InFlag), 0);