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//===-- PTXISelLowering.cpp - PTX DAG Lowering Implementation -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the PTXTargetLowering class.
//
//===----------------------------------------------------------------------===//
#include "PTXISelLowering.h"
#include "PTXRegisterInfo.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
using namespace llvm;
PTXTargetLowering::PTXTargetLowering(TargetMachine &TM)
: TargetLowering(TM, new TargetLoweringObjectFileELF()) {
// Set up the register classes.
addRegisterClass(MVT::i1, PTX::PredsRegisterClass);
// Compute derived properties from the register classes
computeRegisterProperties();
}
const char *PTXTargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
default: llvm_unreachable("Unknown opcode");
case PTXISD::EXIT: return "PTXISD::EXIT";
case PTXISD::RET: return "PTXISD::RET";
}
}
//===----------------------------------------------------------------------===//
// Calling Convention Implementation
//===----------------------------------------------------------------------===//
SDValue PTXTargetLowering::
LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv,
bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl,
SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const {
return Chain;
}
SDValue PTXTargetLowering::
LowerReturn(SDValue Chain,
CallingConv::ID CallConv,
bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
DebugLoc dl,
SelectionDAG &DAG) const {
assert(!isVarArg && "PTX does not support var args.");
switch (CallConv) {
default:
llvm_unreachable("Unsupported calling convention.");
case CallingConv::PTX_Kernel:
assert(Outs.size() == 0 && "Kernel must return void.");
return DAG.getNode(PTXISD::EXIT, dl, MVT::Other, Chain);
case CallingConv::PTX_Device:
assert(Outs.size() <= 1 && "Can at most return one value.");
break;
}
// PTX_Device
if (Outs.size() == 0)
return DAG.getNode(PTXISD::RET, dl, MVT::Other, Chain);
// TODO: allocate return register
SDValue Flag;
return DAG.getNode(PTXISD::RET, dl, MVT::Other, Chain, Flag);
}
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