523 lines
18 KiB
C++
523 lines
18 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 "PTXISelLowering.h"
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#include "PTX.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/Function.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/MachineFrameInfo.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/Debug.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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// 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::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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setBooleanVectorContents(ZeroOrOneBooleanContent); // FIXME: Is this correct?
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setMinFunctionAlignment(2);
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// Let LLVM use loads/stores for all mem* operations
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maxStoresPerMemcpy = 4096;
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maxStoresPerMemmove = 4096;
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maxStoresPerMemset = 4096;
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////////////////////////////////////
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/////////// Expansion //////////////
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////////////////////////////////////
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// (any/zero/sign) extload => load + (any/zero/sign) 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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// f32 extload => load + fextend
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setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
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// f64 truncstore => trunc + store
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setTruncStoreAction(MVT::f64, MVT::f32, Expand);
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// sign_extend_inreg => sign_extend
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setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
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// br_cc => brcond
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setOperationAction(ISD::BR_CC, MVT::Other, Expand);
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// select_cc => 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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////////////////////////////////////
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//////////// Legal /////////////////
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////////////////////////////////////
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setOperationAction(ISD::ConstantFP, MVT::f32, Legal);
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setOperationAction(ISD::ConstantFP, MVT::f64, Legal);
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////////////////////////////////////
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//////////// Custom ////////////////
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////////////////////////////////////
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// customise setcc to use bitwise logic if possible
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//setOperationAction(ISD::SETCC, MVT::i1, Custom);
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setOperationAction(ISD::SETCC, MVT::i1, Legal);
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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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// Compute derived properties from the register classes
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computeRegisterProperties();
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}
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EVT 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::READ_PARAM:
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return "PTXISD::READ_PARAM";
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case PTXISD::WRITE_PARAM:
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return "PTXISD::WRITE_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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case PTXISD::CALL:
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return "PTXISD::CALL";
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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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//
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// return DAG.getNode(ISD::AND, dl, MVT::i1, Op0, Op1);
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//}
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//ConstantSDNode* COp1 = cast<ConstantSDNode>(Op1);
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//if(COp1 && COp1->getZExtValue() == 1) {
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// if(CC == ISD::SETNE) {
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// return DAG.getNode(PTX::XORripreds, dl, MVT::i1, Op0);
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// }
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//}
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llvm_unreachable("setcc was not matched by a pattern!");
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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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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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PTXParamManager &PM = MFI->getParamManager();
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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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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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unsigned ParamSize = Ins[i].VT.getStoreSizeInBits();
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unsigned Param = PM.addArgumentParam(ParamSize);
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const std::string &ParamName = PM.getParamName(Param);
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SDValue ParamValue = DAG.getTargetExternalSymbol(ParamName.c_str(),
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MVT::Other);
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SDValue ArgValue = DAG.getNode(PTXISD::LOAD_PARAM, dl, Ins[i].VT, Chain,
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ParamValue);
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InVals.push_back(ArgValue);
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}
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}
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else {
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for (unsigned i = 0, e = Ins.size(); i != e; ++i) {
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EVT RegVT = Ins[i].VT;
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const TargetRegisterClass* TRC = getRegClassFor(RegVT);
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unsigned RegType;
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// Determine which register class we need
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if (RegVT == MVT::i1)
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RegType = PTXRegisterType::Pred;
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else if (RegVT == MVT::i16)
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RegType = PTXRegisterType::B16;
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else if (RegVT == MVT::i32)
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RegType = PTXRegisterType::B32;
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else if (RegVT == MVT::i64)
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RegType = PTXRegisterType::B64;
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else if (RegVT == MVT::f32)
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RegType = PTXRegisterType::F32;
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else if (RegVT == MVT::f64)
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RegType = PTXRegisterType::F64;
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else
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llvm_unreachable("Unknown parameter type");
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// Use a unique index in the instruction to prevent instruction folding.
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// Yes, this is a hack.
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SDValue Index = DAG.getTargetConstant(i, MVT::i32);
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unsigned Reg = MF.getRegInfo().createVirtualRegister(TRC);
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SDValue ArgValue = DAG.getNode(PTXISD::READ_PARAM, dl, RegVT, Chain,
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Index);
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InVals.push_back(ArgValue);
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MFI->addRegister(Reg, RegType, PTXRegisterSpace::Argument);
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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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PTXParamManager &PM = MFI->getParamManager();
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SDValue Flag;
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const PTXSubtarget& ST = getTargetMachine().getSubtarget<PTXSubtarget>();
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if (ST.useParamSpaceForDeviceArgs()) {
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assert(Outs.size() < 2 && "Device functions can return at most one value");
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if (Outs.size() == 1) {
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unsigned ParamSize = OutVals[0].getValueType().getSizeInBits();
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unsigned Param = PM.addReturnParam(ParamSize);
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const std::string &ParamName = PM.getParamName(Param);
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SDValue ParamValue = DAG.getTargetExternalSymbol(ParamName.c_str(),
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MVT::Other);
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Chain = DAG.getNode(PTXISD::STORE_PARAM, dl, MVT::Other, Chain,
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ParamValue, OutVals[0]);
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}
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} else {
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for (unsigned i = 0, e = Outs.size(); i != e; ++i) {
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EVT RegVT = Outs[i].VT;
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const TargetRegisterClass* TRC;
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unsigned RegType;
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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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RegType = PTXRegisterType::Pred;
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}
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else if (RegVT == MVT::i16) {
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TRC = PTX::RegI16RegisterClass;
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RegType = PTXRegisterType::B16;
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}
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else if (RegVT == MVT::i32) {
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TRC = PTX::RegI32RegisterClass;
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RegType = PTXRegisterType::B32;
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}
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else if (RegVT == MVT::i64) {
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TRC = PTX::RegI64RegisterClass;
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RegType = PTXRegisterType::B64;
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}
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else if (RegVT == MVT::f32) {
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TRC = PTX::RegF32RegisterClass;
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RegType = PTXRegisterType::F32;
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}
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else if (RegVT == MVT::f64) {
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TRC = PTX::RegF64RegisterClass;
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RegType = PTXRegisterType::F64;
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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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SDValue Copy = DAG.getCopyToReg(Chain, dl, Reg, OutVals[i]/*, Flag*/);
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SDValue OutReg = DAG.getRegister(Reg, RegVT);
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Chain = DAG.getNode(PTXISD::WRITE_PARAM, dl, MVT::Other, Copy, OutReg);
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MFI->addRegister(Reg, RegType, PTXRegisterSpace::Return);
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}
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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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SDValue
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PTXTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
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CallingConv::ID CallConv, bool isVarArg,
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bool doesNotRet, bool &isTailCall,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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const SmallVectorImpl<SDValue> &OutVals,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals) const {
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MachineFunction& MF = DAG.getMachineFunction();
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PTXMachineFunctionInfo *PTXMFI = MF.getInfo<PTXMachineFunctionInfo>();
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PTXParamManager &PM = PTXMFI->getParamManager();
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MachineFrameInfo *MFI = MF.getFrameInfo();
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assert(getTargetMachine().getSubtarget<PTXSubtarget>().callsAreHandled() &&
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"Calls are not handled for the target device");
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// Identify the callee function
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const GlobalValue *GV = cast<GlobalAddressSDNode>(Callee)->getGlobal();
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const Function *function = cast<Function>(GV);
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// allow non-device calls only for printf
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bool isPrintf = function->getName() == "printf" || function->getName() == "puts";
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assert((isPrintf || function->getCallingConv() == CallingConv::PTX_Device) &&
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"PTX function calls must be to PTX device functions");
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unsigned outSize = isPrintf ? 2 : Outs.size();
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std::vector<SDValue> Ops;
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// The layout of the ops will be [Chain, #Ins, Ins, Callee, #Outs, Outs]
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Ops.resize(outSize + Ins.size() + 4);
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Ops[0] = Chain;
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// Identify the callee function
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Callee = DAG.getTargetGlobalAddress(GV, dl, getPointerTy());
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Ops[Ins.size()+2] = Callee;
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// #Outs
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Ops[Ins.size()+3] = DAG.getTargetConstant(outSize, MVT::i32);
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if (isPrintf) {
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// first argument is the address of the global string variable in memory
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unsigned Param0 = PM.addLocalParam(getPointerTy().getSizeInBits());
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SDValue ParamValue0 = DAG.getTargetExternalSymbol(PM.getParamName(Param0).c_str(),
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MVT::Other);
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Chain = DAG.getNode(PTXISD::STORE_PARAM, dl, MVT::Other, Chain,
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ParamValue0, OutVals[0]);
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Ops[Ins.size()+4] = ParamValue0;
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// alignment is the maximum size of all the arguments
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unsigned alignment = 0;
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for (unsigned i = 1; i < OutVals.size(); ++i) {
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alignment = std::max(alignment,
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OutVals[i].getValueType().getSizeInBits());
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}
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// size is the alignment multiplied by the number of arguments
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unsigned size = alignment * (OutVals.size() - 1);
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// second argument is the address of the stack object (unless no arguments)
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unsigned Param1 = PM.addLocalParam(getPointerTy().getSizeInBits());
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SDValue ParamValue1 = DAG.getTargetExternalSymbol(PM.getParamName(Param1).c_str(),
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MVT::Other);
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Ops[Ins.size()+5] = ParamValue1;
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if (size > 0)
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{
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// create a local stack object to store the arguments
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unsigned StackObject = MFI->CreateStackObject(size / 8, alignment / 8, false);
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SDValue FrameIndex = DAG.getFrameIndex(StackObject, getPointerTy());
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// store each of the arguments to the stack in turn
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for (unsigned int i = 1; i != OutVals.size(); i++) {
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SDValue FrameAddr = DAG.getNode(ISD::ADD, dl, getPointerTy(), FrameIndex, DAG.getTargetConstant((i - 1) * 8, getPointerTy()));
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Chain = DAG.getStore(Chain, dl, OutVals[i], FrameAddr,
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MachinePointerInfo(),
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false, false, 0);
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}
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// copy the address of the local frame index to get the address in non-local space
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SDValue genericAddr = DAG.getNode(PTXISD::COPY_ADDRESS, dl, getPointerTy(), FrameIndex);
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// store this address in the second argument
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Chain = DAG.getNode(PTXISD::STORE_PARAM, dl, MVT::Other, Chain, ParamValue1, genericAddr);
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}
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}
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else
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{
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// Generate STORE_PARAM nodes for each function argument. In PTX, function
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// arguments are explicitly stored into .param variables and passed as
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// arguments. There is no register/stack-based calling convention in PTX.
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|
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;
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
Ops[0] = Chain;
|
|
|
|
// Create the CALL node.
|
|
Chain = DAG.getNode(PTXISD::CALL, dl, MVT::Other, &Ops[0], Ops.size());
|
|
|
|
// 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);
|
|
}
|
|
|
|
return Chain;
|
|
}
|
|
|
|
unsigned PTXTargetLowering::getNumRegisters(LLVMContext &Context, EVT VT) {
|
|
// All arguments consist of one "register," regardless of the type.
|
|
return 1;
|
|
}
|
|
|