Match more patterns to movt.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84751 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelDAGToDAG.cpp b/lib/Target/ARM/ARMISelDAGToDAG.cpp
index c39de0a..6e97693 100644
--- a/lib/Target/ARM/ARMISelDAGToDAG.cpp
+++ b/lib/Target/ARM/ARMISelDAGToDAG.cpp
@@ -1427,6 +1427,43 @@
}
}
break;
+ case ISD::AND: {
+ // (and (or x, c2), c1) and top 16-bits of c1 and c2 match, lower 16-bits
+ // of c1 are 0xffff, and lower 16-bit of c2 are 0. That is, the top 16-bits
+ // are entirely contributed by c2 and lower 16-bits are entirely contributed
+ // by x. That's equal to (or (and x, 0xffff), (and c1, 0xffff0000)).
+ // Select it to: "movt x, ((c1 & 0xffff) >> 16)
+ EVT VT = Op.getValueType();
+ if (VT != MVT::i32)
+ break;
+ unsigned Opc = (Subtarget->isThumb() && Subtarget->hasThumb2())
+ ? ARM::t2MOVTi16
+ : (Subtarget->hasV6T2Ops() ? ARM::MOVTi16 : 0);
+ if (!Opc)
+ break;
+ SDValue N0 = Op.getOperand(0), N1 = Op.getOperand(1);
+ ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
+ if (!N1C)
+ break;
+ if (N0.getOpcode() == ISD::OR && N0.getNode()->hasOneUse()) {
+ SDValue N2 = N0.getOperand(1);
+ ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2);
+ if (!N2C)
+ break;
+ unsigned N1CVal = N1C->getZExtValue();
+ unsigned N2CVal = N2C->getZExtValue();
+ if ((N1CVal & 0xffff0000U) == (N2CVal & 0xffff0000U) &&
+ (N1CVal & 0xffffU) == 0xffffU &&
+ (N2CVal & 0xffffU) == 0x0U) {
+ SDValue Imm16 = CurDAG->getTargetConstant((N2CVal & 0xFFFF0000U) >> 16,
+ MVT::i32);
+ SDValue Ops[] = { N0.getOperand(0), Imm16,
+ getAL(CurDAG), CurDAG->getRegister(0, MVT::i32) };
+ return CurDAG->getMachineNode(Opc, dl, VT, Ops, 4);
+ }
+ }
+ break;
+ }
case ARMISD::FMRRD:
return CurDAG->getMachineNode(ARM::FMRRD, dl, MVT::i32, MVT::i32,
Op.getOperand(0), getAL(CurDAG),