HexagonSplitConst32AndConst64.cpp revision f931f691ee23d431135481fcf23a58658824ca67
1f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma//=== HexagonSplitConst32AndConst64.cpp - split CONST32/Const64 into HI/LO ===// 2f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// 3f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// The LLVM Compiler Infrastructure 4f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// 5f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// This file is distributed under the University of Illinois Open Source 6f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// License. See LICENSE.TXT for details. 7f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// 8f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma//===----------------------------------------------------------------------===// 9f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// 10f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// When the compiler is invoked with no small data, for instance, with the -G0 11f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// command line option, then all CONST32_* opcodes should be broken down into 12f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// appropriate LO and HI instructions. This splitting is done by this pass. 13f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// The only reason this is not done in the DAG lowering itself is that there 14f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// is no simple way of getting the register allocator to allot the same hard 15f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// register to the result of LO and HI instructions. This pass is always 16f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// scheduled after register allocation. 17f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// 18f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma//===----------------------------------------------------------------------===// 19f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#define DEBUG_TYPE "xfer" 20f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/CodeGen/Passes.h" 21f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/CodeGen/ScheduleDAGInstrs.h" 22f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/CodeGen/LatencyPriorityQueue.h" 23f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/CodeGen/SchedulerRegistry.h" 24f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/CodeGen/MachineDominators.h" 25f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/CodeGen/MachineFunctionPass.h" 26f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/CodeGen/MachineLoopInfo.h" 27f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/CodeGen/MachineRegisterInfo.h" 28f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/CodeGen/ScheduleHazardRecognizer.h" 29f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/Target/TargetMachine.h" 30f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/Target/TargetInstrInfo.h" 31f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/Target/TargetRegisterInfo.h" 32f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/Support/Compiler.h" 33f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/Support/Debug.h" 34f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/ADT/Statistic.h" 35f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/Support/MathExtras.h" 36f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/CodeGen/MachineInstrBuilder.h" 37f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "HexagonTargetMachine.h" 38f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "HexagonSubtarget.h" 39f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "HexagonMachineFunctionInfo.h" 40f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include <map> 41f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include <iostream> 42f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 43f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#include "llvm/Support/CommandLine.h" 44f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma#define DEBUG_TYPE "xfer" 45f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 46f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 47f931f691ee23d431135481fcf23a58658824ca67Jyotsna Vermausing namespace llvm; 48f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 49f931f691ee23d431135481fcf23a58658824ca67Jyotsna Vermanamespace { 50f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 51f931f691ee23d431135481fcf23a58658824ca67Jyotsna Vermaclass HexagonSplitConst32AndConst64 : public MachineFunctionPass { 52f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma const HexagonTargetMachine& QTM; 53f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma const HexagonSubtarget &QST; 54f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 55f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma public: 56f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma static char ID; 57f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma HexagonSplitConst32AndConst64(const HexagonTargetMachine& TM) 58f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma : MachineFunctionPass(ID), QTM(TM), QST(*TM.getSubtargetImpl()) {} 59f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 60f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma const char *getPassName() const { 61f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma return "Hexagon Split Const32s and Const64s"; 62f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma } 63f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma bool runOnMachineFunction(MachineFunction &Fn); 64f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma}; 65f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 66f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 67f931f691ee23d431135481fcf23a58658824ca67Jyotsna Vermachar HexagonSplitConst32AndConst64::ID = 0; 68f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 69f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 70f931f691ee23d431135481fcf23a58658824ca67Jyotsna Vermabool HexagonSplitConst32AndConst64::runOnMachineFunction(MachineFunction &Fn) { 71f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 72f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma const TargetInstrInfo *TII = QTM.getInstrInfo(); 73f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 74f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma // Loop over all of the basic blocks 75f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma for (MachineFunction::iterator MBBb = Fn.begin(), MBBe = Fn.end(); 76f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma MBBb != MBBe; ++MBBb) { 77f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma MachineBasicBlock* MBB = MBBb; 78f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma // Traverse the basic block 79f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma MachineBasicBlock::iterator MII = MBB->begin(); 80f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma MachineBasicBlock::iterator MIE = MBB->end (); 81f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma while (MII != MIE) { 82f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma MachineInstr *MI = MII; 83f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma int Opc = MI->getOpcode(); 84f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma if (Opc == Hexagon::CONST32_set) { 85f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma int DestReg = MI->getOperand(0).getReg(); 86f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma MachineOperand &Symbol = MI->getOperand (1); 87f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 88f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma BuildMI (*MBB, MII, MI->getDebugLoc(), 89f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma TII->get(Hexagon::LO), DestReg).addOperand(Symbol); 90f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma BuildMI (*MBB, MII, MI->getDebugLoc(), 91f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma TII->get(Hexagon::HI), DestReg).addOperand(Symbol); 92f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma // MBB->erase returns the iterator to the next instruction, which is the 93f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma // one we want to process next 94f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma MII = MBB->erase (MI); 95f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma continue; 96f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma } 97f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma else if (Opc == Hexagon::CONST32_set_jt) { 98f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma int DestReg = MI->getOperand(0).getReg(); 99f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma MachineOperand &Symbol = MI->getOperand (1); 100f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 101f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma BuildMI (*MBB, MII, MI->getDebugLoc(), 102f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma TII->get(Hexagon::LO_jt), DestReg).addOperand(Symbol); 103f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma BuildMI (*MBB, MII, MI->getDebugLoc(), 104f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma TII->get(Hexagon::HI_jt), DestReg).addOperand(Symbol); 105f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma // MBB->erase returns the iterator to the next instruction, which is the 106f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma // one we want to process next 107f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma MII = MBB->erase (MI); 108f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma continue; 109f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma } 110f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma else if (Opc == Hexagon::CONST32_Label) { 111f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma int DestReg = MI->getOperand(0).getReg(); 112f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma MachineOperand &Symbol = MI->getOperand (1); 113f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 114f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma BuildMI (*MBB, MII, MI->getDebugLoc(), 115f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma TII->get(Hexagon::LO_label), DestReg).addOperand(Symbol); 116f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma BuildMI (*MBB, MII, MI->getDebugLoc(), 117f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma TII->get(Hexagon::HI_label), DestReg).addOperand(Symbol); 118f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma // MBB->erase returns the iterator to the next instruction, which is the 119f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma // one we want to process next 120f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma MII = MBB->erase (MI); 121f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma continue; 122f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma } 123f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma else if (Opc == Hexagon::CONST32_Int_Real) { 124f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma int DestReg = MI->getOperand(0).getReg(); 125f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma int64_t ImmValue = MI->getOperand(1).getImm (); 126f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 127f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma BuildMI (*MBB, MII, MI->getDebugLoc(), 128f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma TII->get(Hexagon::LOi), DestReg).addImm(ImmValue); 129f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma BuildMI (*MBB, MII, MI->getDebugLoc(), 130f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma TII->get(Hexagon::HIi), DestReg).addImm(ImmValue); 131f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma MII = MBB->erase (MI); 132f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma continue; 133f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma } 134f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma else if (Opc == Hexagon::CONST64_Int_Real) { 135f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma int DestReg = MI->getOperand(0).getReg(); 136f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma int64_t ImmValue = MI->getOperand(1).getImm (); 137f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma unsigned DestLo = 138f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma QTM.getRegisterInfo()->getSubReg (DestReg, Hexagon::subreg_loreg); 139f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma unsigned DestHi = 140f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma QTM.getRegisterInfo()->getSubReg (DestReg, Hexagon::subreg_hireg); 141f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 142f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma int32_t LowWord = (ImmValue & 0xFFFFFFFF); 143f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma int32_t HighWord = (ImmValue >> 32) & 0xFFFFFFFF; 144f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 145f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma // Lower Registers Lower Half 146f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma BuildMI (*MBB, MII, MI->getDebugLoc(), 147f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma TII->get(Hexagon::LOi), DestLo).addImm(LowWord); 148f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma // Lower Registers Higher Half 149f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma BuildMI (*MBB, MII, MI->getDebugLoc(), 150f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma TII->get(Hexagon::HIi), DestLo).addImm(LowWord); 151f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma // Higher Registers Lower Half 152f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma BuildMI (*MBB, MII, MI->getDebugLoc(), 153f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma TII->get(Hexagon::LOi), DestHi).addImm(HighWord); 154f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma // Higher Registers Higher Half. 155f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma BuildMI (*MBB, MII, MI->getDebugLoc(), 156f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma TII->get(Hexagon::HIi), DestHi).addImm(HighWord); 157f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma MII = MBB->erase (MI); 158f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma continue; 159f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma } 160f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma ++MII; 161f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma } 162f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma } 163f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 164f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma return true; 165f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma} 166f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 167f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma} 168f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 169f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma//===----------------------------------------------------------------------===// 170f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma// Public Constructor Functions 171f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma//===----------------------------------------------------------------------===// 172f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma 173f931f691ee23d431135481fcf23a58658824ca67Jyotsna VermaFunctionPass * 174f931f691ee23d431135481fcf23a58658824ca67Jyotsna Vermallvm::createHexagonSplitConst32AndConst64(const HexagonTargetMachine &TM) { 175f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma return new HexagonSplitConst32AndConst64(TM); 176f931f691ee23d431135481fcf23a58658824ca67Jyotsna Verma} 177