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Diffstat (limited to 'contrib/llvm/lib/Target/CellSPU/SPUInstrInfo.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/CellSPU/SPUInstrInfo.cpp | 453 |
1 files changed, 453 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/CellSPU/SPUInstrInfo.cpp b/contrib/llvm/lib/Target/CellSPU/SPUInstrInfo.cpp new file mode 100644 index 0000000..759923d --- /dev/null +++ b/contrib/llvm/lib/Target/CellSPU/SPUInstrInfo.cpp @@ -0,0 +1,453 @@ +//===-- SPUInstrInfo.cpp - Cell SPU Instruction Information ---------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file contains the Cell SPU implementation of the TargetInstrInfo class. +// +//===----------------------------------------------------------------------===// + +#include "SPUInstrInfo.h" +#include "SPUInstrBuilder.h" +#include "SPUTargetMachine.h" +#include "SPUHazardRecognizers.h" +#include "llvm/CodeGen/MachineInstrBuilder.h" +#include "llvm/MC/MCContext.h" +#include "llvm/Support/Debug.h" +#include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/TargetRegistry.h" +#include "llvm/Support/raw_ostream.h" + +#define GET_INSTRINFO_CTOR +#include "SPUGenInstrInfo.inc" + +using namespace llvm; + +namespace { + //! Predicate for an unconditional branch instruction + inline bool isUncondBranch(const MachineInstr *I) { + unsigned opc = I->getOpcode(); + + return (opc == SPU::BR + || opc == SPU::BRA + || opc == SPU::BI); + } + + //! Predicate for a conditional branch instruction + inline bool isCondBranch(const MachineInstr *I) { + unsigned opc = I->getOpcode(); + + return (opc == SPU::BRNZr32 + || opc == SPU::BRNZv4i32 + || opc == SPU::BRZr32 + || opc == SPU::BRZv4i32 + || opc == SPU::BRHNZr16 + || opc == SPU::BRHNZv8i16 + || opc == SPU::BRHZr16 + || opc == SPU::BRHZv8i16); + } +} + +SPUInstrInfo::SPUInstrInfo(SPUTargetMachine &tm) + : SPUGenInstrInfo(SPU::ADJCALLSTACKDOWN, SPU::ADJCALLSTACKUP), + TM(tm), + RI(*TM.getSubtargetImpl(), *this) +{ /* NOP */ } + +/// CreateTargetHazardRecognizer - Return the hazard recognizer to use for +/// this target when scheduling the DAG. +ScheduleHazardRecognizer *SPUInstrInfo::CreateTargetHazardRecognizer( + const TargetMachine *TM, + const ScheduleDAG *DAG) const { + const TargetInstrInfo *TII = TM->getInstrInfo(); + assert(TII && "No InstrInfo?"); + return new SPUHazardRecognizer(*TII); +} + +unsigned +SPUInstrInfo::isLoadFromStackSlot(const MachineInstr *MI, + int &FrameIndex) const { + switch (MI->getOpcode()) { + default: break; + case SPU::LQDv16i8: + case SPU::LQDv8i16: + case SPU::LQDv4i32: + case SPU::LQDv4f32: + case SPU::LQDv2f64: + case SPU::LQDr128: + case SPU::LQDr64: + case SPU::LQDr32: + case SPU::LQDr16: { + const MachineOperand MOp1 = MI->getOperand(1); + const MachineOperand MOp2 = MI->getOperand(2); + if (MOp1.isImm() && MOp2.isFI()) { + FrameIndex = MOp2.getIndex(); + return MI->getOperand(0).getReg(); + } + break; + } + } + return 0; +} + +unsigned +SPUInstrInfo::isStoreToStackSlot(const MachineInstr *MI, + int &FrameIndex) const { + switch (MI->getOpcode()) { + default: break; + case SPU::STQDv16i8: + case SPU::STQDv8i16: + case SPU::STQDv4i32: + case SPU::STQDv4f32: + case SPU::STQDv2f64: + case SPU::STQDr128: + case SPU::STQDr64: + case SPU::STQDr32: + case SPU::STQDr16: + case SPU::STQDr8: { + const MachineOperand MOp1 = MI->getOperand(1); + const MachineOperand MOp2 = MI->getOperand(2); + if (MOp1.isImm() && MOp2.isFI()) { + FrameIndex = MOp2.getIndex(); + return MI->getOperand(0).getReg(); + } + break; + } + } + return 0; +} + +void SPUInstrInfo::copyPhysReg(MachineBasicBlock &MBB, + MachineBasicBlock::iterator I, DebugLoc DL, + unsigned DestReg, unsigned SrcReg, + bool KillSrc) const +{ + // We support cross register class moves for our aliases, such as R3 in any + // reg class to any other reg class containing R3. This is required because + // we instruction select bitconvert i64 -> f64 as a noop for example, so our + // types have no specific meaning. + + BuildMI(MBB, I, DL, get(SPU::LRr128), DestReg) + .addReg(SrcReg, getKillRegState(KillSrc)); +} + +void +SPUInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB, + MachineBasicBlock::iterator MI, + unsigned SrcReg, bool isKill, int FrameIdx, + const TargetRegisterClass *RC, + const TargetRegisterInfo *TRI) const +{ + unsigned opc; + bool isValidFrameIdx = (FrameIdx < SPUFrameLowering::maxFrameOffset()); + if (RC == SPU::GPRCRegisterClass) { + opc = (isValidFrameIdx ? SPU::STQDr128 : SPU::STQXr128); + } else if (RC == SPU::R64CRegisterClass) { + opc = (isValidFrameIdx ? SPU::STQDr64 : SPU::STQXr64); + } else if (RC == SPU::R64FPRegisterClass) { + opc = (isValidFrameIdx ? SPU::STQDr64 : SPU::STQXr64); + } else if (RC == SPU::R32CRegisterClass) { + opc = (isValidFrameIdx ? SPU::STQDr32 : SPU::STQXr32); + } else if (RC == SPU::R32FPRegisterClass) { + opc = (isValidFrameIdx ? SPU::STQDr32 : SPU::STQXr32); + } else if (RC == SPU::R16CRegisterClass) { + opc = (isValidFrameIdx ? SPU::STQDr16 : SPU::STQXr16); + } else if (RC == SPU::R8CRegisterClass) { + opc = (isValidFrameIdx ? SPU::STQDr8 : SPU::STQXr8); + } else if (RC == SPU::VECREGRegisterClass) { + opc = (isValidFrameIdx) ? SPU::STQDv16i8 : SPU::STQXv16i8; + } else { + llvm_unreachable("Unknown regclass!"); + } + + DebugLoc DL; + if (MI != MBB.end()) DL = MI->getDebugLoc(); + addFrameReference(BuildMI(MBB, MI, DL, get(opc)) + .addReg(SrcReg, getKillRegState(isKill)), FrameIdx); +} + +void +SPUInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB, + MachineBasicBlock::iterator MI, + unsigned DestReg, int FrameIdx, + const TargetRegisterClass *RC, + const TargetRegisterInfo *TRI) const +{ + unsigned opc; + bool isValidFrameIdx = (FrameIdx < SPUFrameLowering::maxFrameOffset()); + if (RC == SPU::GPRCRegisterClass) { + opc = (isValidFrameIdx ? SPU::LQDr128 : SPU::LQXr128); + } else if (RC == SPU::R64CRegisterClass) { + opc = (isValidFrameIdx ? SPU::LQDr64 : SPU::LQXr64); + } else if (RC == SPU::R64FPRegisterClass) { + opc = (isValidFrameIdx ? SPU::LQDr64 : SPU::LQXr64); + } else if (RC == SPU::R32CRegisterClass) { + opc = (isValidFrameIdx ? SPU::LQDr32 : SPU::LQXr32); + } else if (RC == SPU::R32FPRegisterClass) { + opc = (isValidFrameIdx ? SPU::LQDr32 : SPU::LQXr32); + } else if (RC == SPU::R16CRegisterClass) { + opc = (isValidFrameIdx ? SPU::LQDr16 : SPU::LQXr16); + } else if (RC == SPU::R8CRegisterClass) { + opc = (isValidFrameIdx ? SPU::LQDr8 : SPU::LQXr8); + } else if (RC == SPU::VECREGRegisterClass) { + opc = (isValidFrameIdx) ? SPU::LQDv16i8 : SPU::LQXv16i8; + } else { + llvm_unreachable("Unknown regclass in loadRegFromStackSlot!"); + } + + DebugLoc DL; + if (MI != MBB.end()) DL = MI->getDebugLoc(); + addFrameReference(BuildMI(MBB, MI, DL, get(opc), DestReg), FrameIdx); +} + +//! Branch analysis +/*! + \note This code was kiped from PPC. There may be more branch analysis for + CellSPU than what's currently done here. + */ +bool +SPUInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB, + MachineBasicBlock *&FBB, + SmallVectorImpl<MachineOperand> &Cond, + bool AllowModify) const { + // If the block has no terminators, it just falls into the block after it. + MachineBasicBlock::iterator I = MBB.end(); + if (I == MBB.begin()) + return false; + --I; + while (I->isDebugValue()) { + if (I == MBB.begin()) + return false; + --I; + } + if (!isUnpredicatedTerminator(I)) + return false; + + // Get the last instruction in the block. + MachineInstr *LastInst = I; + + // If there is only one terminator instruction, process it. + if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) { + if (isUncondBranch(LastInst)) { + // Check for jump tables + if (!LastInst->getOperand(0).isMBB()) + return true; + TBB = LastInst->getOperand(0).getMBB(); + return false; + } else if (isCondBranch(LastInst)) { + // Block ends with fall-through condbranch. + TBB = LastInst->getOperand(1).getMBB(); + DEBUG(errs() << "Pushing LastInst: "); + DEBUG(LastInst->dump()); + Cond.push_back(MachineOperand::CreateImm(LastInst->getOpcode())); + Cond.push_back(LastInst->getOperand(0)); + return false; + } + // Otherwise, don't know what this is. + return true; + } + + // Get the instruction before it if it's a terminator. + MachineInstr *SecondLastInst = I; + + // If there are three terminators, we don't know what sort of block this is. + if (SecondLastInst && I != MBB.begin() && + isUnpredicatedTerminator(--I)) + return true; + + // If the block ends with a conditional and unconditional branch, handle it. + if (isCondBranch(SecondLastInst) && isUncondBranch(LastInst)) { + TBB = SecondLastInst->getOperand(1).getMBB(); + DEBUG(errs() << "Pushing SecondLastInst: "); + DEBUG(SecondLastInst->dump()); + Cond.push_back(MachineOperand::CreateImm(SecondLastInst->getOpcode())); + Cond.push_back(SecondLastInst->getOperand(0)); + FBB = LastInst->getOperand(0).getMBB(); + return false; + } + + // If the block ends with two unconditional branches, handle it. The second + // one is not executed, so remove it. + if (isUncondBranch(SecondLastInst) && isUncondBranch(LastInst)) { + TBB = SecondLastInst->getOperand(0).getMBB(); + I = LastInst; + if (AllowModify) + I->eraseFromParent(); + return false; + } + + // Otherwise, can't handle this. + return true; +} + +// search MBB for branch hint labels and branch hit ops +static void removeHBR( MachineBasicBlock &MBB) { + for (MachineBasicBlock::iterator I = MBB.begin(); I != MBB.end(); ++I){ + if (I->getOpcode() == SPU::HBRA || + I->getOpcode() == SPU::HBR_LABEL){ + I=MBB.erase(I); + if (I == MBB.end()) + break; + } + } +} + +unsigned +SPUInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const { + MachineBasicBlock::iterator I = MBB.end(); + removeHBR(MBB); + if (I == MBB.begin()) + return 0; + --I; + while (I->isDebugValue()) { + if (I == MBB.begin()) + return 0; + --I; + } + if (!isCondBranch(I) && !isUncondBranch(I)) + return 0; + + // Remove the first branch. + DEBUG(errs() << "Removing branch: "); + DEBUG(I->dump()); + I->eraseFromParent(); + I = MBB.end(); + if (I == MBB.begin()) + return 1; + + --I; + if (!(isCondBranch(I) || isUncondBranch(I))) + return 1; + + // Remove the second branch. + DEBUG(errs() << "Removing second branch: "); + DEBUG(I->dump()); + I->eraseFromParent(); + return 2; +} + +/** Find the optimal position for a hint branch instruction in a basic block. + * This should take into account: + * -the branch hint delays + * -congestion of the memory bus + * -dual-issue scheduling (i.e. avoid insertion of nops) + * Current implementation is rather simplistic. + */ +static MachineBasicBlock::iterator findHBRPosition(MachineBasicBlock &MBB) +{ + MachineBasicBlock::iterator J = MBB.end(); + for( int i=0; i<8; i++) { + if( J == MBB.begin() ) return J; + J--; + } + return J; +} + +unsigned +SPUInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB, + MachineBasicBlock *FBB, + const SmallVectorImpl<MachineOperand> &Cond, + DebugLoc DL) const { + // Shouldn't be a fall through. + assert(TBB && "InsertBranch must not be told to insert a fallthrough"); + assert((Cond.size() == 2 || Cond.size() == 0) && + "SPU branch conditions have two components!"); + + MachineInstrBuilder MIB; + //TODO: make a more accurate algorithm. + bool haveHBR = MBB.size()>8; + + removeHBR(MBB); + MCSymbol *branchLabel = MBB.getParent()->getContext().CreateTempSymbol(); + // Add a label just before the branch + if (haveHBR) + MIB = BuildMI(&MBB, DL, get(SPU::HBR_LABEL)).addSym(branchLabel); + + // One-way branch. + if (FBB == 0) { + if (Cond.empty()) { + // Unconditional branch + MIB = BuildMI(&MBB, DL, get(SPU::BR)); + MIB.addMBB(TBB); + + DEBUG(errs() << "Inserted one-way uncond branch: "); + DEBUG((*MIB).dump()); + + // basic blocks have just one branch so it is safe to add the hint a its + if (haveHBR) { + MIB = BuildMI( MBB, findHBRPosition(MBB), DL, get(SPU::HBRA)); + MIB.addSym(branchLabel); + MIB.addMBB(TBB); + } + } else { + // Conditional branch + MIB = BuildMI(&MBB, DL, get(Cond[0].getImm())); + MIB.addReg(Cond[1].getReg()).addMBB(TBB); + + if (haveHBR) { + MIB = BuildMI(MBB, findHBRPosition(MBB), DL, get(SPU::HBRA)); + MIB.addSym(branchLabel); + MIB.addMBB(TBB); + } + + DEBUG(errs() << "Inserted one-way cond branch: "); + DEBUG((*MIB).dump()); + } + return 1; + } else { + MIB = BuildMI(&MBB, DL, get(Cond[0].getImm())); + MachineInstrBuilder MIB2 = BuildMI(&MBB, DL, get(SPU::BR)); + + // Two-way Conditional Branch. + MIB.addReg(Cond[1].getReg()).addMBB(TBB); + MIB2.addMBB(FBB); + + if (haveHBR) { + MIB = BuildMI( MBB, findHBRPosition(MBB), DL, get(SPU::HBRA)); + MIB.addSym(branchLabel); + MIB.addMBB(FBB); + } + + DEBUG(errs() << "Inserted conditional branch: "); + DEBUG((*MIB).dump()); + DEBUG(errs() << "part 2: "); + DEBUG((*MIB2).dump()); + return 2; + } +} + +//! Reverses a branch's condition, returning false on success. +bool +SPUInstrInfo::ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) + const { + // Pretty brainless way of inverting the condition, but it works, considering + // there are only two conditions... + static struct { + unsigned Opc; //! The incoming opcode + unsigned RevCondOpc; //! The reversed condition opcode + } revconds[] = { + { SPU::BRNZr32, SPU::BRZr32 }, + { SPU::BRNZv4i32, SPU::BRZv4i32 }, + { SPU::BRZr32, SPU::BRNZr32 }, + { SPU::BRZv4i32, SPU::BRNZv4i32 }, + { SPU::BRHNZr16, SPU::BRHZr16 }, + { SPU::BRHNZv8i16, SPU::BRHZv8i16 }, + { SPU::BRHZr16, SPU::BRHNZr16 }, + { SPU::BRHZv8i16, SPU::BRHNZv8i16 } + }; + + unsigned Opc = unsigned(Cond[0].getImm()); + // Pretty dull mapping between the two conditions that SPU can generate: + for (int i = sizeof(revconds)/sizeof(revconds[0]) - 1; i >= 0; --i) { + if (revconds[i].Opc == Opc) { + Cond[0].setImm(revconds[i].RevCondOpc); + return false; + } + } + + return true; +} |
