use MVN to handle small negative constants
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32459 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelDAGToDAG.cpp b/lib/Target/ARM/ARMISelDAGToDAG.cpp
index 08864a7..48d918c 100644
--- a/lib/Target/ARM/ARMISelDAGToDAG.cpp
+++ b/lib/Target/ARM/ARMISelDAGToDAG.cpp
@@ -781,6 +781,8 @@
virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
bool SelectAddrMode1(SDOperand Op, SDOperand N, SDOperand &Arg,
SDOperand &Shift, SDOperand &ShiftType);
+ bool SelectAddrMode1a(SDOperand Op, SDOperand N, SDOperand &Arg,
+ SDOperand &Shift, SDOperand &ShiftType);
bool SelectAddrMode2(SDOperand Op, SDOperand N, SDOperand &Arg,
SDOperand &Offset);
bool SelectAddrMode5(SDOperand Op, SDOperand N, SDOperand &Arg,
@@ -883,6 +885,25 @@
return true;
}
+bool ARMDAGToDAGISel::SelectAddrMode1a(SDOperand Op,
+ SDOperand N,
+ SDOperand &Arg,
+ SDOperand &Shift,
+ SDOperand &ShiftType) {
+ if (N.getOpcode() != ISD::Constant)
+ return false;
+
+ uint32_t val = ~cast<ConstantSDNode>(N)->getValue();
+ if(!isRotInt8Immediate(val))
+ return false;
+
+ Arg = CurDAG->getTargetConstant(val, MVT::i32);
+ Shift = CurDAG->getTargetConstant(0, MVT::i32);
+ ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
+
+ return true;
+}
+
bool ARMDAGToDAGISel::SelectAddrMode2(SDOperand Op, SDOperand N,
SDOperand &Arg, SDOperand &Offset) {
//TODO: complete and cleanup!