X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FX86%2FX86RegisterInfo.cpp;h=40b65e13f01aec8a60d6423508e838619d18e391;hb=7a2bdde0a0eebcd2125055e0eacaca040f0b766c;hp=da6c94574ca4e857f04137da3e933f466793d165;hpb=d9e3385ced2dc887e2fe8e1c071bd2611e4d3ede;p=oota-llvm.git diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp index da6c94574ca..40b65e13f01 100644 --- a/lib/Target/X86/X86RegisterInfo.cpp +++ b/lib/Target/X86/X86RegisterInfo.cpp @@ -31,7 +31,7 @@ #include "llvm/CodeGen/MachineModuleInfo.h" #include "llvm/CodeGen/MachineRegisterInfo.h" #include "llvm/MC/MCAsmInfo.h" -#include "llvm/Target/TargetFrameInfo.h" +#include "llvm/Target/TargetFrameLowering.h" #include "llvm/Target/TargetInstrInfo.h" #include "llvm/Target/TargetMachine.h" #include "llvm/Target/TargetOptions.h" @@ -60,7 +60,7 @@ X86RegisterInfo::X86RegisterInfo(X86TargetMachine &tm, const X86Subtarget *Subtarget = &TM.getSubtarget(); Is64Bit = Subtarget->is64Bit(); IsWin64 = Subtarget->isTargetWin64(); - StackAlign = TM.getFrameInfo()->getStackAlignment(); + StackAlign = TM.getFrameLowering()->getStackAlignment(); if (Is64Bit) { SlotSize = 8; @@ -316,10 +316,16 @@ X86RegisterInfo::getPointerRegClass(unsigned Kind) const { if (TM.getSubtarget().is64Bit()) return &X86::GR64RegClass; return &X86::GR32RegClass; - case 1: // Normal GRPs except the stack pointer (for encoding reasons). + case 1: // Normal GPRs except the stack pointer (for encoding reasons). if (TM.getSubtarget().is64Bit()) return &X86::GR64_NOSPRegClass; return &X86::GR32_NOSPRegClass; + case 2: // Available for tailcall (not callee-saved GPRs). + if (TM.getSubtarget().isTargetWin64()) + return &X86::GR64_TCW64RegClass; + if (TM.getSubtarget().is64Bit()) + return &X86::GR64_TCRegClass; + return &X86::GR32_TCRegClass; } } @@ -331,7 +337,27 @@ X86RegisterInfo::getCrossCopyRegClass(const TargetRegisterClass *RC) const { else return &X86::GR32RegClass; } - return NULL; + return RC; +} + +unsigned +X86RegisterInfo::getRegPressureLimit(const TargetRegisterClass *RC, + MachineFunction &MF) const { + const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering(); + + unsigned FPDiff = TFI->hasFP(MF) ? 1 : 0; + switch (RC->getID()) { + default: + return 0; + case X86::GR32RegClassID: + return 4 - FPDiff; + case X86::GR64RegClassID: + return 12 - FPDiff; + case X86::VR128RegClassID: + return TM.getSubtarget().is64Bit() ? 10 : 4; + case X86::VR64RegClassID: + return 4; + } } const unsigned * @@ -388,7 +414,7 @@ X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const { BitVector X86RegisterInfo::getReservedRegs(const MachineFunction &MF) const { BitVector Reserved(getNumRegs()); - const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo(); + const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering(); // Set the stack-pointer register and its aliases as reserved. Reserved.set(X86::RSP); @@ -444,18 +470,18 @@ bool X86RegisterInfo::needsStackRealignment(const MachineFunction &MF) const { // FIXME: It's more complicated than this... if (0 && requiresRealignment && MFI->hasVarSizedObjects()) report_fatal_error( - "Stack realignment in presense of dynamic allocas is not supported"); - + "Stack realignment in presence of dynamic allocas is not supported"); + // If we've requested that we force align the stack do so now. if (ForceStackAlign) return canRealignStack(MF); - + return requiresRealignment && canRealignStack(MF); } bool X86RegisterInfo::hasReservedSpillSlot(const MachineFunction &MF, unsigned Reg, int &FrameIdx) const { - const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo(); + const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering(); if (Reg == FramePtr && TFI->hasFP(MF)) { FrameIdx = MF.getFrameInfo()->getObjectIndexBegin(); @@ -464,41 +490,6 @@ bool X86RegisterInfo::hasReservedSpillSlot(const MachineFunction &MF, return false; } -int -X86RegisterInfo::getFrameIndexOffset(const MachineFunction &MF, int FI) const { - const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo(); - const MachineFrameInfo *MFI = MF.getFrameInfo(); - int Offset = MFI->getObjectOffset(FI) - TFI->getOffsetOfLocalArea(); - uint64_t StackSize = MFI->getStackSize(); - - if (needsStackRealignment(MF)) { - if (FI < 0) { - // Skip the saved EBP. - Offset += SlotSize; - } else { - unsigned Align = MFI->getObjectAlignment(FI); - assert((-(Offset + StackSize)) % Align == 0); - Align = 0; - return Offset + StackSize; - } - // FIXME: Support tail calls - } else { - if (!TFI->hasFP(MF)) - return Offset + StackSize; - - // Skip the saved EBP. - Offset += SlotSize; - - // Skip the RETADDR move area - const X86MachineFunctionInfo *X86FI = MF.getInfo(); - int TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta(); - if (TailCallReturnAddrDelta < 0) - Offset -= TailCallReturnAddrDelta; - } - - return Offset; -} - static unsigned getSUBriOpcode(unsigned is64Bit, int64_t Imm) { if (is64Bit) { if (isInt<8>(Imm)) @@ -526,71 +517,70 @@ static unsigned getADDriOpcode(unsigned is64Bit, int64_t Imm) { void X86RegisterInfo:: eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator I) const { - const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo(); - - if (!TFI->hasReservedCallFrame(MF)) { + const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering(); + bool reseveCallFrame = TFI->hasReservedCallFrame(MF); + int Opcode = I->getOpcode(); + bool isDestroy = Opcode == getCallFrameDestroyOpcode(); + DebugLoc DL = I->getDebugLoc(); + uint64_t Amount = !reseveCallFrame ? I->getOperand(0).getImm() : 0; + uint64_t CalleeAmt = isDestroy ? I->getOperand(1).getImm() : 0; + I = MBB.erase(I); + + if (!reseveCallFrame) { // If the stack pointer can be changed after prologue, turn the // adjcallstackup instruction into a 'sub ESP, ' and the // adjcallstackdown instruction into 'add ESP, ' // TODO: consider using push / pop instead of sub + store / add - MachineInstr *Old = I; - uint64_t Amount = Old->getOperand(0).getImm(); - if (Amount != 0) { - // We need to keep the stack aligned properly. To do this, we round the - // amount of space needed for the outgoing arguments up to the next - // alignment boundary. - Amount = (Amount + StackAlign - 1) / StackAlign * StackAlign; - - MachineInstr *New = 0; - if (Old->getOpcode() == getCallFrameSetupOpcode()) { - New = BuildMI(MF, Old->getDebugLoc(), - TII.get(getSUBriOpcode(Is64Bit, Amount)), - StackPtr) - .addReg(StackPtr) - .addImm(Amount); - } else { - assert(Old->getOpcode() == getCallFrameDestroyOpcode()); - - // Factor out the amount the callee already popped. - uint64_t CalleeAmt = Old->getOperand(1).getImm(); - Amount -= CalleeAmt; - - if (Amount) { - unsigned Opc = getADDriOpcode(Is64Bit, Amount); - New = BuildMI(MF, Old->getDebugLoc(), TII.get(Opc), StackPtr) - .addReg(StackPtr) - .addImm(Amount); - } - } + if (Amount == 0) + return; + + // We need to keep the stack aligned properly. To do this, we round the + // amount of space needed for the outgoing arguments up to the next + // alignment boundary. + Amount = (Amount + StackAlign - 1) / StackAlign * StackAlign; + + MachineInstr *New = 0; + if (Opcode == getCallFrameSetupOpcode()) { + New = BuildMI(MF, DL, TII.get(getSUBriOpcode(Is64Bit, Amount)), + StackPtr) + .addReg(StackPtr) + .addImm(Amount); + } else { + assert(Opcode == getCallFrameDestroyOpcode()); - if (New) { - // The EFLAGS implicit def is dead. - New->getOperand(3).setIsDead(); + // Factor out the amount the callee already popped. + Amount -= CalleeAmt; - // Replace the pseudo instruction with a new instruction. - MBB.insert(I, New); + if (Amount) { + unsigned Opc = getADDriOpcode(Is64Bit, Amount); + New = BuildMI(MF, DL, TII.get(Opc), StackPtr) + .addReg(StackPtr).addImm(Amount); } } - } else if (I->getOpcode() == getCallFrameDestroyOpcode()) { - // If we are performing frame pointer elimination and if the callee pops - // something off the stack pointer, add it back. We do this until we have - // more advanced stack pointer tracking ability. - if (uint64_t CalleeAmt = I->getOperand(1).getImm()) { - unsigned Opc = getSUBriOpcode(Is64Bit, CalleeAmt); - MachineInstr *Old = I; - MachineInstr *New = - BuildMI(MF, Old->getDebugLoc(), TII.get(Opc), - StackPtr) - .addReg(StackPtr) - .addImm(CalleeAmt); + if (New) { // The EFLAGS implicit def is dead. New->getOperand(3).setIsDead(); + + // Replace the pseudo instruction with a new instruction. MBB.insert(I, New); } + + return; } - MBB.erase(I); + if (Opcode == getCallFrameDestroyOpcode() && CalleeAmt) { + // If we are performing frame pointer elimination and if the callee pops + // something off the stack pointer, add it back. We do this until we have + // more advanced stack pointer tracking ability. + unsigned Opc = getSUBriOpcode(Is64Bit, CalleeAmt); + MachineInstr *New = BuildMI(MF, DL, TII.get(Opc), StackPtr) + .addReg(StackPtr).addImm(CalleeAmt); + + // The EFLAGS implicit def is dead. + New->getOperand(3).setIsDead(); + MBB.insert(I, New); + } } void @@ -601,7 +591,7 @@ X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, unsigned i = 0; MachineInstr &MI = *II; MachineFunction &MF = *MI.getParent()->getParent(); - const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo(); + const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering(); while (!MI.getOperand(i).isFI()) { ++i; @@ -631,7 +621,7 @@ X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, const MachineFrameInfo *MFI = MF.getFrameInfo(); FIOffset = MFI->getObjectOffset(FrameIndex) - TFI->getOffsetOfLocalArea(); } else - FIOffset = getFrameIndexOffset(MF, FrameIndex); + FIOffset = TFI->getFrameIndexOffset(MF, FrameIndex); if (MI.getOperand(i+3).isImm()) { // Offset is a 32-bit integer. @@ -644,53 +634,13 @@ X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, } } -void -X86RegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF, - RegScavenger *RS) const { - MachineFrameInfo *MFI = MF.getFrameInfo(); - const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo(); - - X86MachineFunctionInfo *X86FI = MF.getInfo(); - int32_t TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta(); - - if (TailCallReturnAddrDelta < 0) { - // create RETURNADDR area - // arg - // arg - // RETADDR - // { ... - // RETADDR area - // ... - // } - // [EBP] - MFI->CreateFixedObject(-TailCallReturnAddrDelta, - (-1U*SlotSize)+TailCallReturnAddrDelta, true); - } - - if (TFI->hasFP(MF)) { - assert((TailCallReturnAddrDelta <= 0) && - "The Delta should always be zero or negative"); - const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo(); - - // Create a frame entry for the EBP register that must be saved. - int FrameIdx = MFI->CreateFixedObject(SlotSize, - -(int)SlotSize + - TFI.getOffsetOfLocalArea() + - TailCallReturnAddrDelta, - true); - assert(FrameIdx == MFI->getObjectIndexBegin() && - "Slot for EBP register must be last in order to be found!"); - FrameIdx = 0; - } -} - unsigned X86RegisterInfo::getRARegister() const { return Is64Bit ? X86::RIP // Should have dwarf #16. : X86::EIP; // Should have dwarf #8. } unsigned X86RegisterInfo::getFrameRegister(const MachineFunction &MF) const { - const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo(); + const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering(); return TFI->hasFP(MF) ? FramePtr : StackPtr; } @@ -890,13 +840,13 @@ namespace { // Be over-conservative: scan over all vreg defs and find whether vector // registers are used. If yes, there is a possibility that vector register // will be spilled and thus require dynamic stack realignment. - for (unsigned RegNum = TargetRegisterInfo::FirstVirtualRegister; - RegNum < RI.getLastVirtReg(); ++RegNum) - if (RI.getRegClass(RegNum)->getAlignment() > StackAlignment) { + for (unsigned i = 0, e = RI.getNumVirtRegs(); i != e; ++i) { + unsigned Reg = TargetRegisterInfo::index2VirtReg(i); + if (RI.getRegClass(Reg)->getAlignment() > StackAlignment) { FuncInfo->setReserveFP(true); return true; } - + } // Nothing to do return false; }