#include "PTXISelLowering.h"
#include "PTXMachineFunctionInfo.h"
#include "PTXRegisterInfo.h"
+#include "PTXSubtarget.h"
+#include "llvm/Function.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
+#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
+//===----------------------------------------------------------------------===//
+// TargetLowering Implementation
+//===----------------------------------------------------------------------===//
+
PTXTargetLowering::PTXTargetLowering(TargetMachine &TM)
: TargetLowering(TM, new TargetLoweringObjectFileELF()) {
// Set up the register classes.
- addRegisterClass(MVT::i1, PTX::PredsRegisterClass);
- addRegisterClass(MVT::i16, PTX::RRegu16RegisterClass);
- addRegisterClass(MVT::i32, PTX::RRegu32RegisterClass);
- addRegisterClass(MVT::i64, PTX::RRegu64RegisterClass);
- addRegisterClass(MVT::f32, PTX::RRegf32RegisterClass);
- addRegisterClass(MVT::f64, PTX::RRegf64RegisterClass);
+ addRegisterClass(MVT::i1, PTX::RegPredRegisterClass);
+ addRegisterClass(MVT::i16, PTX::RegI16RegisterClass);
+ addRegisterClass(MVT::i32, PTX::RegI32RegisterClass);
+ addRegisterClass(MVT::i64, PTX::RegI64RegisterClass);
+ addRegisterClass(MVT::f32, PTX::RegF32RegisterClass);
+ addRegisterClass(MVT::f64, PTX::RegF64RegisterClass);
+
+ setBooleanContents(ZeroOrOneBooleanContent);
+ setBooleanVectorContents(ZeroOrOneBooleanContent); // FIXME: Is this correct?
+ setMinFunctionAlignment(2);
+
+ // Let LLVM use loads/stores for all mem* operations
+ maxStoresPerMemcpy = 4096;
+ maxStoresPerMemmove = 4096;
+ maxStoresPerMemset = 4096;
+
+ ////////////////////////////////////
+ /////////// Expansion //////////////
+ ////////////////////////////////////
+
+ // (any/zero/sign) extload => load + (any/zero/sign) extend
+
+ setLoadExtAction(ISD::EXTLOAD, MVT::i16, Expand);
+ setLoadExtAction(ISD::ZEXTLOAD, MVT::i16, Expand);
+ setLoadExtAction(ISD::SEXTLOAD, MVT::i16, Expand);
+
+ // f32 extload => load + fextend
+
+ setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
+
+ // f64 truncstore => trunc + store
+
+ setTruncStoreAction(MVT::f64, MVT::f32, Expand);
+
+ // sign_extend_inreg => sign_extend
+
+ setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
+
+ // br_cc => brcond
+
+ setOperationAction(ISD::BR_CC, MVT::Other, Expand);
- setOperationAction(ISD::EXCEPTIONADDR, MVT::i32, Expand);
+ // select_cc => setcc
+
+ setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
+ setOperationAction(ISD::SELECT_CC, MVT::f32, Expand);
+ setOperationAction(ISD::SELECT_CC, MVT::f64, Expand);
+
+ ////////////////////////////////////
+ //////////// Legal /////////////////
+ ////////////////////////////////////
setOperationAction(ISD::ConstantFP, MVT::f32, Legal);
setOperationAction(ISD::ConstantFP, MVT::f64, Legal);
- // Customize translation of memory addresses
- setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
+ ////////////////////////////////////
+ //////////// Custom ////////////////
+ ////////////////////////////////////
- // Expand BR_CC into BRCOND
- setOperationAction(ISD::BR_CC, MVT::Other, Expand);
+ // customise setcc to use bitwise logic if possible
+
+ setOperationAction(ISD::SETCC, MVT::i1, Custom);
+
+ // customize translation of memory addresses
+
+ setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
+ setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
// Compute derived properties from the register classes
computeRegisterProperties();
}
+EVT PTXTargetLowering::getSetCCResultType(EVT VT) const {
+ return MVT::i1;
+}
+
SDValue PTXTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
switch (Op.getOpcode()) {
default:
llvm_unreachable("Unimplemented operand");
+ case ISD::SETCC:
+ return LowerSETCC(Op, DAG);
case ISD::GlobalAddress:
return LowerGlobalAddress(Op, DAG);
- case ISD::BRCOND:
- return LowerGlobalAddress(Op, DAG);
}
}
switch (Opcode) {
default:
llvm_unreachable("Unknown opcode");
+ case PTXISD::COPY_ADDRESS:
+ return "PTXISD::COPY_ADDRESS";
+ case PTXISD::LOAD_PARAM:
+ return "PTXISD::LOAD_PARAM";
+ case PTXISD::STORE_PARAM:
+ return "PTXISD::STORE_PARAM";
case PTXISD::READ_PARAM:
return "PTXISD::READ_PARAM";
+ case PTXISD::WRITE_PARAM:
+ return "PTXISD::WRITE_PARAM";
case PTXISD::EXIT:
return "PTXISD::EXIT";
case PTXISD::RET:
return "PTXISD::RET";
+ case PTXISD::CALL:
+ return "PTXISD::CALL";
}
}
// Custom Lower Operation
//===----------------------------------------------------------------------===//
+SDValue PTXTargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
+ assert(Op.getValueType() == MVT::i1 && "SetCC type must be 1-bit integer");
+ SDValue Op0 = Op.getOperand(0);
+ SDValue Op1 = Op.getOperand(1);
+ SDValue Op2 = Op.getOperand(2);
+ DebugLoc dl = Op.getDebugLoc();
+ ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
+
+ // Look for X == 0, X == 1, X != 0, or X != 1
+ // We can simplify these to bitwise logic
+
+ if (Op1.getOpcode() == ISD::Constant &&
+ (cast<ConstantSDNode>(Op1)->getZExtValue() == 1 ||
+ cast<ConstantSDNode>(Op1)->isNullValue()) &&
+ (CC == ISD::SETEQ || CC == ISD::SETNE)) {
+
+ return DAG.getNode(ISD::AND, dl, MVT::i1, Op0, Op1);
+ }
+
+ return DAG.getNode(ISD::SETCC, dl, MVT::i1, Op0, Op1, Op2);
+}
+
SDValue PTXTargetLowering::
LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const {
EVT PtrVT = getPointerTy();
DebugLoc dl = Op.getDebugLoc();
const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
- return DAG.getTargetGlobalAddress(GV, dl, PtrVT);
+
+ assert(PtrVT.isSimple() && "Pointer must be to primitive type.");
+
+ SDValue targetGlobal = DAG.getTargetGlobalAddress(GV, dl, PtrVT);
+ SDValue movInstr = DAG.getNode(PTXISD::COPY_ADDRESS,
+ dl,
+ PtrVT.getSimpleVT(),
+ targetGlobal);
+
+ return movInstr;
}
//===----------------------------------------------------------------------===//
// Calling Convention Implementation
//===----------------------------------------------------------------------===//
-namespace {
-struct argmap_entry {
- MVT::SimpleValueType VT;
- TargetRegisterClass *RC;
- TargetRegisterClass::iterator loc;
-
- argmap_entry(MVT::SimpleValueType _VT, TargetRegisterClass *_RC)
- : VT(_VT), RC(_RC), loc(_RC->begin()) {}
-
- void reset() { loc = RC->begin(); }
- bool operator==(MVT::SimpleValueType _VT) const { return VT == _VT; }
-} argmap[] = {
- argmap_entry(MVT::i1, PTX::PredsRegisterClass),
- argmap_entry(MVT::i16, PTX::RRegu16RegisterClass),
- argmap_entry(MVT::i32, PTX::RRegu32RegisterClass),
- argmap_entry(MVT::i64, PTX::RRegu64RegisterClass),
- argmap_entry(MVT::f32, PTX::RRegf32RegisterClass),
- argmap_entry(MVT::f64, PTX::RRegf64RegisterClass)
-};
-} // end anonymous namespace
-
SDValue PTXTargetLowering::
LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv,
if (isVarArg) llvm_unreachable("PTX does not support varargs");
MachineFunction &MF = DAG.getMachineFunction();
+ const PTXSubtarget& ST = getTargetMachine().getSubtarget<PTXSubtarget>();
PTXMachineFunctionInfo *MFI = MF.getInfo<PTXMachineFunctionInfo>();
+ PTXParamManager &PM = MFI->getParamManager();
switch (CallConv) {
default:
break;
}
- // Make sure we don't add argument registers twice
- if (MFI->isDoneAddArg())
- llvm_unreachable("cannot add argument registers twice");
-
- // Reset argmap before allocation
- for (struct argmap_entry *i = argmap, *e = argmap + array_lengthof(argmap);
- i != e; ++ i)
- i->reset();
-
- for (int i = 0, e = Ins.size(); i != e; ++ i) {
- MVT::SimpleValueType VT = Ins[i].VT.SimpleTy;
-
- struct argmap_entry *entry = std::find(argmap,
- argmap + array_lengthof(argmap), VT);
- if (entry == argmap + array_lengthof(argmap))
- llvm_unreachable("Type of argument is not supported");
-
- if (MFI->isKernel() && entry->RC == PTX::PredsRegisterClass)
- llvm_unreachable("cannot pass preds to kernel");
-
- MachineRegisterInfo &RegInfo = DAG.getMachineFunction().getRegInfo();
-
- unsigned preg = *++(entry->loc); // allocate start from register 1
- unsigned vreg = RegInfo.createVirtualRegister(entry->RC);
- RegInfo.addLiveIn(preg, vreg);
-
- MFI->addArgReg(preg);
-
- SDValue inval;
- if (MFI->isKernel())
- inval = DAG.getNode(PTXISD::READ_PARAM, dl, VT, Chain,
- DAG.getTargetConstant(i, MVT::i32));
- else
- inval = DAG.getCopyFromReg(Chain, dl, vreg, VT);
- InVals.push_back(inval);
+ // We do one of two things here:
+ // IsKernel || SM >= 2.0 -> Use param space for arguments
+ // SM < 2.0 -> Use registers for arguments
+ if (MFI->isKernel() || ST.useParamSpaceForDeviceArgs()) {
+ // We just need to emit the proper LOAD_PARAM ISDs
+ for (unsigned i = 0, e = Ins.size(); i != e; ++i) {
+ assert((!MFI->isKernel() || Ins[i].VT != MVT::i1) &&
+ "Kernels cannot take pred operands");
+
+ unsigned ParamSize = Ins[i].VT.getStoreSizeInBits();
+ unsigned Param = PM.addArgumentParam(ParamSize);
+ const std::string &ParamName = PM.getParamName(Param);
+ SDValue ParamValue = DAG.getTargetExternalSymbol(ParamName.c_str(),
+ MVT::Other);
+ SDValue ArgValue = DAG.getNode(PTXISD::LOAD_PARAM, dl, Ins[i].VT, Chain,
+ ParamValue);
+ InVals.push_back(ArgValue);
+ }
+ }
+ else {
+ for (unsigned i = 0, e = Ins.size(); i != e; ++i) {
+ EVT RegVT = Ins[i].VT;
+ TargetRegisterClass* TRC = getRegClassFor(RegVT);
+ unsigned RegType;
+
+ // Determine which register class we need
+ if (RegVT == MVT::i1) {
+ RegType = PTXRegisterType::Pred;
+ }
+ else if (RegVT == MVT::i16) {
+ RegType = PTXRegisterType::B16;
+ }
+ else if (RegVT == MVT::i32) {
+ RegType = PTXRegisterType::B32;
+ }
+ else if (RegVT == MVT::i64) {
+ RegType = PTXRegisterType::B64;
+ }
+ else if (RegVT == MVT::f32) {
+ RegType = PTXRegisterType::F32;
+ }
+ else if (RegVT == MVT::f64) {
+ RegType = PTXRegisterType::F64;
+ }
+ else {
+ llvm_unreachable("Unknown parameter type");
+ }
+
+ // Use a unique index in the instruction to prevent instruction folding.
+ // Yes, this is a hack.
+ SDValue Index = DAG.getTargetConstant(i, MVT::i32);
+ unsigned Reg = MF.getRegInfo().createVirtualRegister(TRC);
+ SDValue ArgValue = DAG.getNode(PTXISD::READ_PARAM, dl, RegVT, Chain,
+ Index);
+
+ InVals.push_back(ArgValue);
+
+ MFI->addRegister(Reg, RegType, PTXRegisterSpace::Argument);
+ }
}
-
- MFI->doneAddArg();
return Chain;
}
break;
}
- // PTX_Device
-
- // return void
- if (Outs.size() == 0)
- return DAG.getNode(PTXISD::RET, dl, MVT::Other, Chain);
+ MachineFunction& MF = DAG.getMachineFunction();
+ PTXMachineFunctionInfo *MFI = MF.getInfo<PTXMachineFunctionInfo>();
+ PTXParamManager &PM = MFI->getParamManager();
SDValue Flag;
- unsigned reg;
+ const PTXSubtarget& ST = getTargetMachine().getSubtarget<PTXSubtarget>();
+
+ if (ST.useParamSpaceForDeviceArgs()) {
+ assert(Outs.size() < 2 && "Device functions can return at most one value");
+
+ if (Outs.size() == 1) {
+ unsigned ParamSize = OutVals[0].getValueType().getSizeInBits();
+ unsigned Param = PM.addReturnParam(ParamSize);
+ const std::string &ParamName = PM.getParamName(Param);
+ SDValue ParamValue = DAG.getTargetExternalSymbol(ParamName.c_str(),
+ MVT::Other);
+ Chain = DAG.getNode(PTXISD::STORE_PARAM, dl, MVT::Other, Chain,
+ ParamValue, OutVals[0]);
+ }
+ } else {
+ for (unsigned i = 0, e = Outs.size(); i != e; ++i) {
+ EVT RegVT = Outs[i].VT;
+ TargetRegisterClass* TRC = 0;
+ unsigned RegType;
+
+ // Determine which register class we need
+ if (RegVT == MVT::i1) {
+ TRC = PTX::RegPredRegisterClass;
+ RegType = PTXRegisterType::Pred;
+ }
+ else if (RegVT == MVT::i16) {
+ TRC = PTX::RegI16RegisterClass;
+ RegType = PTXRegisterType::B16;
+ }
+ else if (RegVT == MVT::i32) {
+ TRC = PTX::RegI32RegisterClass;
+ RegType = PTXRegisterType::B32;
+ }
+ else if (RegVT == MVT::i64) {
+ TRC = PTX::RegI64RegisterClass;
+ RegType = PTXRegisterType::B64;
+ }
+ else if (RegVT == MVT::f32) {
+ TRC = PTX::RegF32RegisterClass;
+ RegType = PTXRegisterType::F32;
+ }
+ else if (RegVT == MVT::f64) {
+ TRC = PTX::RegF64RegisterClass;
+ RegType = PTXRegisterType::F64;
+ }
+ else {
+ llvm_unreachable("Unknown parameter type");
+ }
+
+ unsigned Reg = MF.getRegInfo().createVirtualRegister(TRC);
+
+ SDValue Copy = DAG.getCopyToReg(Chain, dl, Reg, OutVals[i]/*, Flag*/);
+ SDValue OutReg = DAG.getRegister(Reg, RegVT);
+
+ Chain = DAG.getNode(PTXISD::WRITE_PARAM, dl, MVT::Other, Copy, OutReg);
+
+ MFI->addRegister(Reg, RegType, PTXRegisterSpace::Return);
+ }
+ }
- if (Outs[0].VT == MVT::i16) {
- reg = PTX::RH0;
+ if (Flag.getNode() == 0) {
+ return DAG.getNode(PTXISD::RET, dl, MVT::Other, Chain);
}
- else if (Outs[0].VT == MVT::i32) {
- reg = PTX::R0;
+ else {
+ return DAG.getNode(PTXISD::RET, dl, MVT::Other, Chain, Flag);
}
- else if (Outs[0].VT == MVT::i64) {
- reg = PTX::RD0;
+}
+
+SDValue
+PTXTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
+ CallingConv::ID CallConv, bool isVarArg,
+ bool &isTailCall,
+ const SmallVectorImpl<ISD::OutputArg> &Outs,
+ const SmallVectorImpl<SDValue> &OutVals,
+ const SmallVectorImpl<ISD::InputArg> &Ins,
+ DebugLoc dl, SelectionDAG &DAG,
+ SmallVectorImpl<SDValue> &InVals) const {
+
+ MachineFunction& MF = DAG.getMachineFunction();
+ PTXMachineFunctionInfo *PTXMFI = MF.getInfo<PTXMachineFunctionInfo>();
+ PTXParamManager &PM = PTXMFI->getParamManager();
+ MachineFrameInfo *MFI = MF.getFrameInfo();
+
+ assert(getTargetMachine().getSubtarget<PTXSubtarget>().callsAreHandled() &&
+ "Calls are not handled for the target device");
+
+ // Identify the callee function
+ const GlobalValue *GV = cast<GlobalAddressSDNode>(Callee)->getGlobal();
+ const Function *function = cast<Function>(GV);
+
+ // allow non-device calls only for printf
+ bool isPrintf = function->getName() == "printf" || function->getName() == "puts";
+
+ assert((isPrintf || function->getCallingConv() == CallingConv::PTX_Device) &&
+ "PTX function calls must be to PTX device functions");
+
+ unsigned outSize = isPrintf ? 2 : Outs.size();
+
+ std::vector<SDValue> Ops;
+ // The layout of the ops will be [Chain, #Ins, Ins, Callee, #Outs, Outs]
+ Ops.resize(outSize + Ins.size() + 4);
+
+ Ops[0] = Chain;
+
+ // Identify the callee function
+ Callee = DAG.getTargetGlobalAddress(GV, dl, getPointerTy());
+ Ops[Ins.size()+2] = Callee;
+
+ // #Outs
+ Ops[Ins.size()+3] = DAG.getTargetConstant(outSize, MVT::i32);
+
+ if (isPrintf) {
+ // first argument is the address of the global string variable in memory
+ unsigned Param0 = PM.addLocalParam(getPointerTy().getSizeInBits());
+ SDValue ParamValue0 = DAG.getTargetExternalSymbol(PM.getParamName(Param0).c_str(),
+ MVT::Other);
+ Chain = DAG.getNode(PTXISD::STORE_PARAM, dl, MVT::Other, Chain,
+ ParamValue0, OutVals[0]);
+ Ops[Ins.size()+4] = ParamValue0;
+
+ // alignment is the maximum size of all the arguments
+ unsigned alignment = 0;
+ for (unsigned i = 1; i < OutVals.size(); ++i) {
+ alignment = std::max(alignment,
+ OutVals[i].getValueType().getSizeInBits());
+ }
+
+ // size is the alignment multiplied by the number of arguments
+ unsigned size = alignment * (OutVals.size() - 1);
+
+ // second argument is the address of the stack object (unless no arguments)
+ unsigned Param1 = PM.addLocalParam(getPointerTy().getSizeInBits());
+ SDValue ParamValue1 = DAG.getTargetExternalSymbol(PM.getParamName(Param1).c_str(),
+ MVT::Other);
+ Ops[Ins.size()+5] = ParamValue1;
+
+ if (size > 0)
+ {
+ // create a local stack object to store the arguments
+ unsigned StackObject = MFI->CreateStackObject(size / 8, alignment / 8, false);
+ SDValue FrameIndex = DAG.getFrameIndex(StackObject, getPointerTy());
+
+ // store each of the arguments to the stack in turn
+ for (unsigned int i = 1; i != OutVals.size(); i++) {
+ SDValue FrameAddr = DAG.getNode(ISD::ADD, dl, getPointerTy(), FrameIndex, DAG.getTargetConstant((i - 1) * 8, getPointerTy()));
+ Chain = DAG.getStore(Chain, dl, OutVals[i], FrameAddr,
+ MachinePointerInfo(),
+ false, false, 0);
+ }
+
+ // copy the address of the local frame index to get the address in non-local space
+ SDValue genericAddr = DAG.getNode(PTXISD::COPY_ADDRESS, dl, getPointerTy(), FrameIndex);
+
+ // store this address in the second argument
+ Chain = DAG.getNode(PTXISD::STORE_PARAM, dl, MVT::Other, Chain, ParamValue1, genericAddr);
+ }
}
- else if (Outs[0].VT == MVT::f32) {
- reg = PTX::F0;
+ else
+ {
+ // Generate STORE_PARAM nodes for each function argument. In PTX, function
+ // arguments are explicitly stored into .param variables and passed as
+ // arguments. There is no register/stack-based calling convention in PTX.
+ for (unsigned i = 0; i != OutVals.size(); ++i) {
+ unsigned Size = OutVals[i].getValueType().getSizeInBits();
+ unsigned Param = PM.addLocalParam(Size);
+ const std::string &ParamName = PM.getParamName(Param);
+ SDValue ParamValue = DAG.getTargetExternalSymbol(ParamName.c_str(),
+ MVT::Other);
+ Chain = DAG.getNode(PTXISD::STORE_PARAM, dl, MVT::Other, Chain,
+ ParamValue, OutVals[i]);
+ Ops[i+Ins.size()+4] = ParamValue;
+ }
}
- else {
- assert(Outs[0].VT == MVT::f64 && "Can return only basic types");
- reg = PTX::FD0;
+
+ std::vector<SDValue> InParams;
+
+ // Generate list of .param variables to hold the return value(s).
+ Ops[1] = DAG.getTargetConstant(Ins.size(), MVT::i32);
+ for (unsigned i = 0; i < Ins.size(); ++i) {
+ unsigned Size = Ins[i].VT.getStoreSizeInBits();
+ unsigned Param = PM.addLocalParam(Size);
+ const std::string &ParamName = PM.getParamName(Param);
+ SDValue ParamValue = DAG.getTargetExternalSymbol(ParamName.c_str(),
+ MVT::Other);
+ Ops[i+2] = ParamValue;
+ InParams.push_back(ParamValue);
}
- MachineFunction &MF = DAG.getMachineFunction();
- PTXMachineFunctionInfo *MFI = MF.getInfo<PTXMachineFunctionInfo>();
- MFI->setRetReg(reg);
+ Ops[0] = Chain;
- // If this is the first return lowered for this function, add the regs to the
- // liveout set for the function
- if (DAG.getMachineFunction().getRegInfo().liveout_empty())
- DAG.getMachineFunction().getRegInfo().addLiveOut(reg);
+ // Create the CALL node.
+ Chain = DAG.getNode(PTXISD::CALL, dl, MVT::Other, &Ops[0], Ops.size());
- // Copy the result values into the output registers
- Chain = DAG.getCopyToReg(Chain, dl, reg, OutVals[0], Flag);
+ // Create the LOAD_PARAM nodes that retrieve the function return value(s).
+ for (unsigned i = 0; i < Ins.size(); ++i) {
+ SDValue Load = DAG.getNode(PTXISD::LOAD_PARAM, dl, Ins[i].VT, Chain,
+ InParams[i]);
+ InVals.push_back(Load);
+ }
- // Guarantee that all emitted copies are stuck together,
- // avoiding something bad
- Flag = Chain.getValue(1);
+ return Chain;
+}
- return DAG.getNode(PTXISD::RET, dl, MVT::Other, Chain, Flag);
+unsigned PTXTargetLowering::getNumRegisters(LLVMContext &Context, EVT VT) {
+ // All arguments consist of one "register," regardless of the type.
+ return 1;
}
+
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