SDNode *MipsDAGToDAGISel::SelectLoadFp64(SDNode *N) {
MVT::SimpleValueType NVT =
N->getValueType(0).getSimpleVT().SimpleTy;
if (!Subtarget.isMips1() || NVT != MVT::f64)
return NULL;
LoadSDNode *LN = cast<LoadSDNode>(N);
if (LN->getExtensionType() != ISD::NON_EXTLOAD ||
LN->getAddressingMode() != ISD::UNINDEXED)
return NULL;
SDValue Chain = N->getOperand(0);
SDValue N1 = N->getOperand(1);
SDValue Offset0, Offset1, Base;
if (!SelectAddr(N1, Base, Offset0) ||
N1.getValueType() != MVT::i32)
return NULL;
MachineSDNode::mmo_iterator MemRefs0 = MF->allocateMemRefsArray(1);
MemRefs0[0] = cast<MemSDNode>(N)->getMemOperand();
DebugLoc dl = N->getDebugLoc();
// The second load should start after for 4 bytes.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Offset0))
Offset1 = CurDAG->getTargetConstant(C->getSExtValue()+4, MVT::i32);
else if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Offset0))
Offset1 = CurDAG->getTargetConstantPool(CP->getConstVal(),
MVT::i32,
CP->getAlignment(),
CP->getOffset()+4,
CP->getTargetFlags());
else
return NULL;
// Choose the offsets depending on the endianess
if (TM.getTargetData()->isBigEndian())
std::swap(Offset0, Offset1);
// Instead of:
// ldc $f0, X($3)
// Generate:
// lwc $f0, X($3)
// lwc $f1, X+4($3)
SDNode *LD0 = CurDAG->getMachineNode(Mips::LWC1, dl, MVT::f32,
MVT::Other, Base, Offset0, Chain);
SDValue Undef = SDValue(CurDAG->getMachineNode(TargetOpcode::IMPLICIT_DEF,
dl, NVT), 0);
SDValue I0 = CurDAG->getTargetInsertSubreg(Mips::sub_fpeven, dl,
MVT::f64, Undef, SDValue(LD0, 0));
SDNode *LD1 = CurDAG->getMachineNode(Mips::LWC1, dl, MVT::f32,
MVT::Other, Base, Offset1, SDValue(LD0, 1));
SDValue I1 = CurDAG->getTargetInsertSubreg(Mips::sub_fpodd, dl,
MVT::f64, I0, SDValue(LD1, 0));
ReplaceUses(SDValue(N, 0), I1);
ReplaceUses(SDValue(N, 1), Chain);
cast<MachineSDNode>(LD0)->setMemRefs(MemRefs0, MemRefs0 + 1);
cast<MachineSDNode>(LD1)->setMemRefs(MemRefs0, MemRefs0 + 1);
return I1.getNode();
}
