X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FMips%2FMipsRegisterInfo.cpp;h=bb06da9ac01984799da81cfb496dae709db1d777;hb=588158674572502daefbae5225715070274e6482;hp=acea7dacaab2c053b73751ac2edf5380903e7eef;hpb=99027d76f31d0a9f9c86a08114545dca8b3d2dc1;p=oota-llvm.git diff --git a/lib/Target/Mips/MipsRegisterInfo.cpp b/lib/Target/Mips/MipsRegisterInfo.cpp index acea7dacaab..bb06da9ac01 100644 --- a/lib/Target/Mips/MipsRegisterInfo.cpp +++ b/lib/Target/Mips/MipsRegisterInfo.cpp @@ -24,7 +24,6 @@ #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/MachineFrameInfo.h" -#include "llvm/CodeGen/MachineLocation.h" #include "llvm/Target/TargetFrameLowering.h" #include "llvm/Target/TargetMachine.h" #include "llvm/Target/TargetOptions.h" @@ -35,13 +34,16 @@ #include "llvm/Support/raw_ostream.h" #include "llvm/ADT/BitVector.h" #include "llvm/ADT/STLExtras.h" +#include "llvm/Analysis/DebugInfo.h" + +#define GET_REGINFO_TARGET_DESC +#include "MipsGenRegisterInfo.inc" using namespace llvm; MipsRegisterInfo::MipsRegisterInfo(const MipsSubtarget &ST, const TargetInstrInfo &tii) - : MipsGenRegisterInfo(Mips::ADJCALLSTACKDOWN, Mips::ADJCALLSTACKUP), - Subtarget(ST), TII(tii) {} + : MipsGenRegisterInfo(Mips::RA), Subtarget(ST), TII(tii) {} /// getRegisterNumbering - Given the enum value for some register, e.g. /// Mips::RA, return the number that it corresponds to (e.g. 31). @@ -65,16 +67,16 @@ getRegisterNumbering(unsigned RegEnum) case Mips::T5 : case Mips::F13: return 13; case Mips::T6 : case Mips::F14: case Mips::D7: return 14; case Mips::T7 : case Mips::F15: return 15; - case Mips::T8 : case Mips::F16: case Mips::D8: return 16; - case Mips::T9 : case Mips::F17: return 17; - case Mips::S0 : case Mips::F18: case Mips::D9: return 18; - case Mips::S1 : case Mips::F19: return 19; - case Mips::S2 : case Mips::F20: case Mips::D10: return 20; - case Mips::S3 : case Mips::F21: return 21; - case Mips::S4 : case Mips::F22: case Mips::D11: return 22; - case Mips::S5 : case Mips::F23: return 23; - case Mips::S6 : case Mips::F24: case Mips::D12: return 24; - case Mips::S7 : case Mips::F25: return 25; + case Mips::S0 : case Mips::F16: case Mips::D8: return 16; + case Mips::S1 : case Mips::F17: return 17; + case Mips::S2 : case Mips::F18: case Mips::D9: return 18; + case Mips::S3 : case Mips::F19: return 19; + case Mips::S4 : case Mips::F20: case Mips::D10: return 20; + case Mips::S5 : case Mips::F21: return 21; + case Mips::S6 : case Mips::F22: case Mips::D11: return 22; + case Mips::S7 : case Mips::F23: return 23; + case Mips::T8 : case Mips::F24: case Mips::D12: return 24; + case Mips::T9 : case Mips::F25: return 25; case Mips::K0 : case Mips::F26: case Mips::D13: return 26; case Mips::K1 : case Mips::F27: return 27; case Mips::GP : case Mips::F28: case Mips::D14: return 28; @@ -98,22 +100,22 @@ getCalleeSavedRegs(const MachineFunction *MF) const { // Mips callee-save register range is $16-$23, $f20-$f30 static const unsigned SingleFloatOnlyCalleeSavedRegs[] = { - Mips::S0, Mips::S1, Mips::S2, Mips::S3, - Mips::S4, Mips::S5, Mips::S6, Mips::S7, - Mips::F20, Mips::F21, Mips::F22, Mips::F23, Mips::F24, Mips::F25, - Mips::F26, Mips::F27, Mips::F28, Mips::F29, Mips::F30, 0 + Mips::F30, Mips::F29, Mips::F28, Mips::F27, Mips::F26, + Mips::F25, Mips::F24, Mips::F23, Mips::F22, Mips::F21, Mips::F20, + Mips::RA, Mips::FP, Mips::S7, Mips::S6, Mips::S5, Mips::S4, + Mips::S3, Mips::S2, Mips::S1, Mips::S0, 0 }; - static const unsigned BitMode32CalleeSavedRegs[] = { - Mips::S0, Mips::S1, Mips::S2, Mips::S3, - Mips::S4, Mips::S5, Mips::S6, Mips::S7, - Mips::F20, Mips::F22, Mips::F24, Mips::F26, Mips::F28, Mips::F30, 0 + static const unsigned Mips32CalleeSavedRegs[] = { + Mips::D15, Mips::D14, Mips::D13, Mips::D12, Mips::D11, Mips::D10, + Mips::RA, Mips::FP, Mips::S7, Mips::S6, Mips::S5, Mips::S4, + Mips::S3, Mips::S2, Mips::S1, Mips::S0, 0 }; if (Subtarget.isSingleFloat()) return SingleFloatOnlyCalleeSavedRegs; else - return BitMode32CalleeSavedRegs; + return Mips32CalleeSavedRegs; } BitVector MipsRegisterInfo:: @@ -128,11 +130,6 @@ getReservedRegs(const MachineFunction &MF) const { Reserved.set(Mips::FP); Reserved.set(Mips::RA); - // SRV4 requires that odd register can't be used. - if (!Subtarget.isSingleFloat()) - for (unsigned FReg=(Mips::F0)+1; FReg < Mips::F30; FReg+=2) - Reserved.set(FReg); - return Reserved; } @@ -153,6 +150,8 @@ eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj, RegScavenger *RS) const { MachineInstr &MI = *II; MachineFunction &MF = *MI.getParent()->getParent(); + MachineFrameInfo *MFI = MF.getFrameInfo(); + MipsFunctionInfo *MipsFI = MF.getInfo(); unsigned i = 0; while (!MI.getOperand(i).isFI()) { @@ -172,62 +171,69 @@ eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj, << "spOffset : " << spOffset << "\n" << "stackSize : " << stackSize << "\n"); - // as explained on LowerFormalArguments, detect negative offsets - // and adjust SPOffsets considering the final stack size. - int Offset = ((spOffset < 0) ? (stackSize + (-(spOffset+4))) : (spOffset)); - Offset += MI.getOperand(i-1).getImm(); + const std::vector &CSI = MFI->getCalleeSavedInfo(); + int MinCSFI = 0; + int MaxCSFI = -1; + + if (CSI.size()) { + MinCSFI = CSI[0].getFrameIdx(); + MaxCSFI = CSI[CSI.size() - 1].getFrameIdx(); + } + + // The following stack frame objects are always referenced relative to $sp: + // 1. Outgoing arguments. + // 2. Pointer to dynamically allocated stack space. + // 3. Locations for callee-saved registers. + // Everything else is referenced relative to whatever register + // getFrameRegister() returns. + unsigned FrameReg; + + if (MipsFI->isOutArgFI(FrameIndex) || MipsFI->isDynAllocFI(FrameIndex) || + (FrameIndex >= MinCSFI && FrameIndex <= MaxCSFI)) + FrameReg = Mips::SP; + else + FrameReg = getFrameRegister(MF); + + // Calculate final offset. + // - There is no need to change the offset if the frame object is one of the + // following: an outgoing argument, pointer to a dynamically allocated + // stack space or a $gp restore location, + // - If the frame object is any of the following, its offset must be adjusted + // by adding the size of the stack: + // incoming argument, callee-saved register location or local variable. + int Offset; + + if (MipsFI->isOutArgFI(FrameIndex) || MipsFI->isGPFI(FrameIndex) || + MipsFI->isDynAllocFI(FrameIndex)) + Offset = spOffset; + else + Offset = spOffset + stackSize; + + Offset += MI.getOperand(i+1).getImm(); DEBUG(errs() << "Offset : " << Offset << "\n" << "<--------->\n"); - unsigned NewReg = 0; - int NewImm = 0; - MachineBasicBlock &MBB = *MI.getParent(); - bool ATUsed; - unsigned OrigReg = getFrameRegister(MF); - int OrigImm = Offset; - -// OrigImm fits in the 16-bit field - if (OrigImm < 0x8000 && OrigImm >= -0x8000) { - NewReg = OrigReg; - NewImm = OrigImm; - ATUsed = false; - } - else { - const TargetInstrInfo *TII = MF.getTarget().getInstrInfo(); + // If MI is not a debug value, make sure Offset fits in the 16-bit immediate + // field. + if (!MI.isDebugValue() && (Offset >= 0x8000 || Offset < -0x8000)) { + MachineBasicBlock &MBB = *MI.getParent(); DebugLoc DL = II->getDebugLoc(); - int ImmLo = OrigImm & 0xffff; - int ImmHi = (((unsigned)OrigImm & 0xffff0000) >> 16) + ((OrigImm & 0x8000) != 0); + int ImmHi = (((unsigned)Offset & 0xffff0000) >> 16) + + ((Offset & 0x8000) != 0); // FIXME: change this when mips goes MC". - BuildMI(MBB, II, DL, TII->get(Mips::NOAT)); - BuildMI(MBB, II, DL, TII->get(Mips::LUi), Mips::AT).addImm(ImmHi); - BuildMI(MBB, II, DL, TII->get(Mips::ADDu), Mips::AT).addReg(OrigReg).addReg(Mips::AT); - NewReg = Mips::AT; - NewImm = ImmLo; - - ATUsed = true; - } + BuildMI(MBB, II, DL, TII.get(Mips::NOAT)); + BuildMI(MBB, II, DL, TII.get(Mips::LUi), Mips::AT).addImm(ImmHi); + BuildMI(MBB, II, DL, TII.get(Mips::ADDu), Mips::AT).addReg(FrameReg) + .addReg(Mips::AT); + FrameReg = Mips::AT; + Offset = (short)(Offset & 0xffff); - // FIXME: change this when mips goes MC". - if (ATUsed) BuildMI(MBB, ++II, MI.getDebugLoc(), TII.get(Mips::ATMACRO)); + } - MI.getOperand(i).ChangeToRegister(NewReg, false); - MI.getOperand(i-1).ChangeToImmediate(NewImm); -} - -void MipsRegisterInfo:: -processFunctionBeforeFrameFinalized(MachineFunction &MF) const { - // Set the stack offset where GP must be saved/loaded from. - MachineFrameInfo *MFI = MF.getFrameInfo(); - MipsFunctionInfo *MipsFI = MF.getInfo(); - if (MipsFI->needGPSaveRestore()) - MFI->setObjectOffset(MipsFI->getGPFI(), MipsFI->getGPStackOffset()); -} - -unsigned MipsRegisterInfo:: -getRARegister() const { - return Mips::RA; + MI.getOperand(i).ChangeToRegister(FrameReg, false); + MI.getOperand(i+1).ChangeToImmediate(Offset); } unsigned MipsRegisterInfo:: @@ -248,11 +254,3 @@ getEHHandlerRegister() const { llvm_unreachable("What is the exception handler register"); return 0; } - -int MipsRegisterInfo:: -getDwarfRegNum(unsigned RegNum, bool isEH) const { - llvm_unreachable("What is the dwarf register number"); - return -1; -} - -#include "MipsGenRegisterInfo.inc"