[X86] Copy memrefs when folding a load for division instruction selection.

llvm-svn: 343419
This commit is contained in:
Craig Topper 2018-09-30 17:47:18 +00:00
parent 873a50901b
commit 99ad2a5723
1 changed files with 10 additions and 8 deletions
llvm/lib/Target/X86

View File

@ -3266,20 +3266,22 @@ void X86DAGToDAGISel::Select(SDNode *Node) {
if (NVT == MVT::i8 && (!isSigned || signBitIsZero)) {
// Special case for div8, just use a move with zero extension to AX to
// clear the upper 8 bits (AH).
SDValue Tmp0, Tmp1, Tmp2, Tmp3, Tmp4, Move, Chain;
SDValue Tmp0, Tmp1, Tmp2, Tmp3, Tmp4, Chain;
MachineSDNode *Move;
if (tryFoldLoad(Node, N0, Tmp0, Tmp1, Tmp2, Tmp3, Tmp4)) {
SDValue Ops[] = { Tmp0, Tmp1, Tmp2, Tmp3, Tmp4, N0.getOperand(0) };
Move =
SDValue(CurDAG->getMachineNode(X86::MOVZX32rm8, dl, MVT::i32,
MVT::Other, Ops), 0);
Chain = Move.getValue(1);
Move = CurDAG->getMachineNode(X86::MOVZX32rm8, dl, MVT::i32,
MVT::Other, Ops);
Chain = SDValue(Move, 1);
ReplaceUses(N0.getValue(1), Chain);
// Record the mem-refs
CurDAG->setNodeMemRefs(Move, {cast<LoadSDNode>(N0)->getMemOperand()});
} else {
Move =
SDValue(CurDAG->getMachineNode(X86::MOVZX32rr8, dl, MVT::i32, N0),0);
Move = CurDAG->getMachineNode(X86::MOVZX32rr8, dl, MVT::i32, N0);
Chain = CurDAG->getEntryNode();
}
Chain = CurDAG->getCopyToReg(Chain, dl, X86::EAX, Move, SDValue());
Chain = CurDAG->getCopyToReg(Chain, dl, X86::EAX, SDValue(Move, 0),
SDValue());
InFlag = Chain.getValue(1);
} else {
InFlag =