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https://github.com/c64scene-ar/llvm-6502.git
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b05a8a8f02
The i8 type is required for boolean values, but can only use ld, st and mov instructions. The i1 type continues to be used for predicates. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133814 91177308-0d34-0410-b5e6-96231b3b80d8
363 lines
12 KiB
C++
363 lines
12 KiB
C++
//===-- PTXISelLowering.cpp - PTX DAG Lowering Implementation -------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the PTXTargetLowering class.
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//
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//===----------------------------------------------------------------------===//
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#include "PTX.h"
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#include "PTXISelLowering.h"
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#include "PTXMachineFunctionInfo.h"
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#include "PTXRegisterInfo.h"
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#include "PTXSubtarget.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/CodeGen/CallingConvLower.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Calling Convention Implementation
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//===----------------------------------------------------------------------===//
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#include "PTXGenCallingConv.inc"
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//===----------------------------------------------------------------------===//
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// TargetLowering Implementation
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//===----------------------------------------------------------------------===//
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PTXTargetLowering::PTXTargetLowering(TargetMachine &TM)
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: TargetLowering(TM, new TargetLoweringObjectFileELF()) {
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// Set up the register classes.
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addRegisterClass(MVT::i1, PTX::RegPredRegisterClass);
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addRegisterClass(MVT::i8, PTX::RegI8RegisterClass);
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addRegisterClass(MVT::i16, PTX::RegI16RegisterClass);
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addRegisterClass(MVT::i32, PTX::RegI32RegisterClass);
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addRegisterClass(MVT::i64, PTX::RegI64RegisterClass);
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addRegisterClass(MVT::f32, PTX::RegF32RegisterClass);
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addRegisterClass(MVT::f64, PTX::RegF64RegisterClass);
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setBooleanContents(ZeroOrOneBooleanContent);
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setOperationAction(ISD::EXCEPTIONADDR, MVT::i32, Expand);
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setOperationAction(ISD::ConstantFP, MVT::f32, Legal);
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setOperationAction(ISD::ConstantFP, MVT::f64, Legal);
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// Promote i1 type
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setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote);
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setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
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setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
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setTruncStoreAction(MVT::i8, MVT::i1, Promote);
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setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
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// Turn i16 (z)extload into load + (z)extend
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setLoadExtAction(ISD::EXTLOAD, MVT::i16, Expand);
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setLoadExtAction(ISD::ZEXTLOAD, MVT::i16, Expand);
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setLoadExtAction(ISD::SEXTLOAD, MVT::i16, Expand);
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// Turn f32 extload into load + fextend
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setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
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// Turn f64 truncstore into trunc + store.
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setTruncStoreAction(MVT::f64, MVT::f32, Expand);
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// Customize translation of memory addresses
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setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
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setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
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// Expand BR_CC into BRCOND
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setOperationAction(ISD::BR_CC, MVT::Other, Expand);
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// Expand SELECT_CC into SETCC
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setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
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setOperationAction(ISD::SELECT_CC, MVT::f32, Expand);
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setOperationAction(ISD::SELECT_CC, MVT::f64, Expand);
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// need to lower SETCC of RegPred into bitwise logic
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setOperationAction(ISD::SETCC, MVT::i1, Custom);
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setMinFunctionAlignment(2);
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// Compute derived properties from the register classes
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computeRegisterProperties();
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}
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MVT::SimpleValueType PTXTargetLowering::getSetCCResultType(EVT VT) const {
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return MVT::i1;
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}
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SDValue PTXTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
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switch (Op.getOpcode()) {
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default:
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llvm_unreachable("Unimplemented operand");
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case ISD::SETCC:
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return LowerSETCC(Op, DAG);
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case ISD::GlobalAddress:
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return LowerGlobalAddress(Op, DAG);
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}
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}
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const char *PTXTargetLowering::getTargetNodeName(unsigned Opcode) const {
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switch (Opcode) {
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default:
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llvm_unreachable("Unknown opcode");
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case PTXISD::COPY_ADDRESS:
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return "PTXISD::COPY_ADDRESS";
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case PTXISD::LOAD_PARAM:
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return "PTXISD::LOAD_PARAM";
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case PTXISD::STORE_PARAM:
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return "PTXISD::STORE_PARAM";
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case PTXISD::EXIT:
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return "PTXISD::EXIT";
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case PTXISD::RET:
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return "PTXISD::RET";
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}
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}
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//===----------------------------------------------------------------------===//
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// Custom Lower Operation
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//===----------------------------------------------------------------------===//
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SDValue PTXTargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
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assert(Op.getValueType() == MVT::i1 && "SetCC type must be 1-bit integer");
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SDValue Op0 = Op.getOperand(0);
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SDValue Op1 = Op.getOperand(1);
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SDValue Op2 = Op.getOperand(2);
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DebugLoc dl = Op.getDebugLoc();
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ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
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// Look for X == 0, X == 1, X != 0, or X != 1
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// We can simplify these to bitwise logic
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if (Op1.getOpcode() == ISD::Constant &&
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(cast<ConstantSDNode>(Op1)->getZExtValue() == 1 ||
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cast<ConstantSDNode>(Op1)->isNullValue()) &&
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(CC == ISD::SETEQ || CC == ISD::SETNE)) {
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return DAG.getNode(ISD::AND, dl, MVT::i1, Op0, Op1);
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}
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return DAG.getNode(ISD::SETCC, dl, MVT::i1, Op0, Op1, Op2);
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}
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SDValue PTXTargetLowering::
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LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const {
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EVT PtrVT = getPointerTy();
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DebugLoc dl = Op.getDebugLoc();
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const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
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assert(PtrVT.isSimple() && "Pointer must be to primitive type.");
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SDValue targetGlobal = DAG.getTargetGlobalAddress(GV, dl, PtrVT);
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SDValue movInstr = DAG.getNode(PTXISD::COPY_ADDRESS,
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dl,
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PtrVT.getSimpleVT(),
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targetGlobal);
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return movInstr;
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}
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//===----------------------------------------------------------------------===//
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// Calling Convention Implementation
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//===----------------------------------------------------------------------===//
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namespace {
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struct argmap_entry {
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MVT::SimpleValueType VT;
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TargetRegisterClass *RC;
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TargetRegisterClass::iterator loc;
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argmap_entry(MVT::SimpleValueType _VT, TargetRegisterClass *_RC)
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: VT(_VT), RC(_RC), loc(_RC->begin()) {}
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void reset() { loc = RC->begin(); }
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bool operator==(MVT::SimpleValueType _VT) const { return VT == _VT; }
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} argmap[] = {
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argmap_entry(MVT::i1, PTX::RegPredRegisterClass),
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argmap_entry(MVT::i8, PTX::RegI8RegisterClass),
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argmap_entry(MVT::i16, PTX::RegI16RegisterClass),
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argmap_entry(MVT::i32, PTX::RegI32RegisterClass),
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argmap_entry(MVT::i64, PTX::RegI64RegisterClass),
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argmap_entry(MVT::f32, PTX::RegF32RegisterClass),
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argmap_entry(MVT::f64, PTX::RegF64RegisterClass)
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};
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} // end anonymous namespace
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SDValue PTXTargetLowering::
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LowerFormalArguments(SDValue Chain,
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CallingConv::ID CallConv,
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bool isVarArg,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl,
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SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals) const {
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if (isVarArg) llvm_unreachable("PTX does not support varargs");
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MachineFunction &MF = DAG.getMachineFunction();
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const PTXSubtarget& ST = getTargetMachine().getSubtarget<PTXSubtarget>();
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PTXMachineFunctionInfo *MFI = MF.getInfo<PTXMachineFunctionInfo>();
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switch (CallConv) {
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default:
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llvm_unreachable("Unsupported calling convention");
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break;
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case CallingConv::PTX_Kernel:
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MFI->setKernel(true);
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break;
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case CallingConv::PTX_Device:
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MFI->setKernel(false);
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break;
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}
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// We do one of two things here:
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// IsKernel || SM >= 2.0 -> Use param space for arguments
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// SM < 2.0 -> Use registers for arguments
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if (MFI->isKernel() || ST.useParamSpaceForDeviceArgs()) {
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// We just need to emit the proper LOAD_PARAM ISDs
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for (unsigned i = 0, e = Ins.size(); i != e; ++i) {
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assert((!MFI->isKernel() || Ins[i].VT != MVT::i1) &&
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"Kernels cannot take pred operands");
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SDValue ArgValue = DAG.getNode(PTXISD::LOAD_PARAM, dl, Ins[i].VT, Chain,
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DAG.getTargetConstant(i, MVT::i32));
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InVals.push_back(ArgValue);
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// Instead of storing a physical register in our argument list, we just
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// store the total size of the parameter, in bits. The ASM printer
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// knows how to process this.
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MFI->addArgReg(Ins[i].VT.getStoreSizeInBits());
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}
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}
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else {
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// For device functions, we use the PTX calling convention to do register
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// assignments then create CopyFromReg ISDs for the allocated registers
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SmallVector<CCValAssign, 16> ArgLocs;
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CCState CCInfo(CallConv, isVarArg, MF, getTargetMachine(), ArgLocs,
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*DAG.getContext());
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CCInfo.AnalyzeFormalArguments(Ins, CC_PTX);
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for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
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CCValAssign& VA = ArgLocs[i];
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EVT RegVT = VA.getLocVT();
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TargetRegisterClass* TRC = 0;
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assert(VA.isRegLoc() && "CCValAssign must be RegLoc");
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// Determine which register class we need
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if (RegVT == MVT::i1) {
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TRC = PTX::RegPredRegisterClass;
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}
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else if (RegVT == MVT::i8) {
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TRC = PTX::RegI8RegisterClass;
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}
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else if (RegVT == MVT::i16) {
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TRC = PTX::RegI16RegisterClass;
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}
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else if (RegVT == MVT::i32) {
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TRC = PTX::RegI32RegisterClass;
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}
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else if (RegVT == MVT::i64) {
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TRC = PTX::RegI64RegisterClass;
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}
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else if (RegVT == MVT::f32) {
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TRC = PTX::RegF32RegisterClass;
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}
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else if (RegVT == MVT::f64) {
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TRC = PTX::RegF64RegisterClass;
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}
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else {
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llvm_unreachable("Unknown parameter type");
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}
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unsigned Reg = MF.getRegInfo().createVirtualRegister(TRC);
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MF.getRegInfo().addLiveIn(VA.getLocReg(), Reg);
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SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, RegVT);
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InVals.push_back(ArgValue);
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MFI->addArgReg(VA.getLocReg());
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}
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}
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return Chain;
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}
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SDValue PTXTargetLowering::
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LowerReturn(SDValue Chain,
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CallingConv::ID CallConv,
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bool isVarArg,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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const SmallVectorImpl<SDValue> &OutVals,
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DebugLoc dl,
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SelectionDAG &DAG) const {
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if (isVarArg) llvm_unreachable("PTX does not support varargs");
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switch (CallConv) {
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default:
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llvm_unreachable("Unsupported calling convention.");
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case CallingConv::PTX_Kernel:
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assert(Outs.size() == 0 && "Kernel must return void.");
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return DAG.getNode(PTXISD::EXIT, dl, MVT::Other, Chain);
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case CallingConv::PTX_Device:
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//assert(Outs.size() <= 1 && "Can at most return one value.");
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break;
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}
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MachineFunction& MF = DAG.getMachineFunction();
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PTXMachineFunctionInfo *MFI = MF.getInfo<PTXMachineFunctionInfo>();
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SDValue Flag;
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// Even though we could use the .param space for return arguments for
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// device functions if SM >= 2.0 and the number of return arguments is
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// only 1, we just always use registers since this makes the codegen
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// easier.
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SmallVector<CCValAssign, 16> RVLocs;
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CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
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getTargetMachine(), RVLocs, *DAG.getContext());
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CCInfo.AnalyzeReturn(Outs, RetCC_PTX);
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for (unsigned i = 0, e = RVLocs.size(); i != e; ++i) {
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CCValAssign& VA = RVLocs[i];
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assert(VA.isRegLoc() && "CCValAssign must be RegLoc");
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unsigned Reg = VA.getLocReg();
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DAG.getMachineFunction().getRegInfo().addLiveOut(Reg);
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Chain = DAG.getCopyToReg(Chain, dl, Reg, OutVals[i], Flag);
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// Guarantee that all emitted copies are stuck together,
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// avoiding something bad
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Flag = Chain.getValue(1);
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MFI->addRetReg(Reg);
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}
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if (Flag.getNode() == 0) {
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return DAG.getNode(PTXISD::RET, dl, MVT::Other, Chain);
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}
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else {
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return DAG.getNode(PTXISD::RET, dl, MVT::Other, Chain, Flag);
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}
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}
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