1 //===-- PTXISelLowering.cpp - PTX DAG Lowering Implementation -------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the PTXTargetLowering class.
12 //===----------------------------------------------------------------------===//
14 #include "PTXISelLowering.h"
15 #include "PTXRegisterInfo.h"
16 #include "llvm/Support/ErrorHandling.h"
17 #include "llvm/CodeGen/SelectionDAG.h"
18 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
22 PTXTargetLowering::PTXTargetLowering(TargetMachine &TM)
23 : TargetLowering(TM, new TargetLoweringObjectFileELF()) {
24 // Set up the register classes.
25 addRegisterClass(MVT::i1, PTX::PredsRegisterClass);
27 // Compute derived properties from the register classes
28 computeRegisterProperties();
31 const char *PTXTargetLowering::getTargetNodeName(unsigned Opcode) const {
33 default: llvm_unreachable("Unknown opcode");
34 case PTXISD::EXIT: return "PTXISD::EXIT";
35 case PTXISD::RET: return "PTXISD::RET";
39 //===----------------------------------------------------------------------===//
40 // Calling Convention Implementation
41 //===----------------------------------------------------------------------===//
43 SDValue PTXTargetLowering::
44 LowerFormalArguments(SDValue Chain,
45 CallingConv::ID CallConv,
47 const SmallVectorImpl<ISD::InputArg> &Ins,
50 SmallVectorImpl<SDValue> &InVals) const {
54 SDValue PTXTargetLowering::
55 LowerReturn(SDValue Chain,
56 CallingConv::ID CallConv,
58 const SmallVectorImpl<ISD::OutputArg> &Outs,
59 const SmallVectorImpl<SDValue> &OutVals,
61 SelectionDAG &DAG) const {
62 assert(!isVarArg && "PTX does not support var args.");
66 llvm_unreachable("Unsupported calling convention.");
67 case CallingConv::PTX_Kernel:
68 assert(Outs.size() == 0 && "Kernel must return void.");
69 return DAG.getNode(PTXISD::EXIT, dl, MVT::Other, Chain);
70 case CallingConv::PTX_Device:
71 assert(Outs.size() <= 1 && "Can at most return one value.");
78 return DAG.getNode(PTXISD::RET, dl, MVT::Other, Chain);
80 // TODO: allocate return register
82 return DAG.getNode(PTXISD::RET, dl, MVT::Other, Chain, Flag);