Custom lower SIGN_EXTEND
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70763 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/MSP430/MSP430ISelLowering.cpp b/lib/Target/MSP430/MSP430ISelLowering.cpp
index d609a31..df8072c 100644
--- a/lib/Target/MSP430/MSP430ISelLowering.cpp
+++ b/lib/Target/MSP430/MSP430ISelLowering.cpp
@@ -85,6 +85,7 @@
setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
setOperationAction(ISD::SELECT, MVT::i8, Custom);
setOperationAction(ISD::SELECT, MVT::i16, Custom);
+ setOperationAction(ISD::SIGN_EXTEND, MVT::i16, Custom);
// FIXME: Implement efficiently multiplication by a constant
setOperationAction(ISD::MUL, MVT::i16, Expand);
@@ -107,6 +108,7 @@
case ISD::SETCC: return LowerSETCC(Op, DAG);
case ISD::BRCOND: return LowerBRCOND(Op, DAG);
case ISD::SELECT: return LowerSELECT(Op, DAG);
+ case ISD::SIGN_EXTEND: return LowerSIGN_EXTEND(Op, DAG);
default:
assert(0 && "unimplemented operand");
return SDValue();
@@ -592,6 +594,19 @@
return DAG.getNode(MSP430ISD::SELECT, dl, VTs, &Ops[0], Ops.size());
}
+SDValue MSP430TargetLowering::LowerSIGN_EXTEND(SDValue Op,
+ SelectionDAG &DAG) {
+ SDValue Val = Op.getOperand(0);
+ MVT VT = Op.getValueType();
+ DebugLoc dl = Op.getDebugLoc();
+
+ assert(VT == MVT::i16 && "Only support i16 for now!");
+
+ return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, VT,
+ DAG.getNode(ISD::ANY_EXTEND, dl, VT, Val),
+ DAG.getValueType(Val.getValueType()));
+}
+
const char *MSP430TargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
default: return NULL;
diff --git a/lib/Target/MSP430/MSP430ISelLowering.h b/lib/Target/MSP430/MSP430ISelLowering.h
index d440ca2..32c990d 100644
--- a/lib/Target/MSP430/MSP430ISelLowering.h
+++ b/lib/Target/MSP430/MSP430ISelLowering.h
@@ -86,6 +86,7 @@
SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG);
SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG);
SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG);
+ SDValue LowerSIGN_EXTEND(SDValue Op, SelectionDAG &DAG);
SDValue LowerCCCCallTo(SDValue Op, SelectionDAG &DAG,
unsigned CC);