//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Bruno Cardoso Lopes and is distributed under the
-// University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
-// This file contains the MIPS implementation of the MRegisterInfo class.
+// This file contains the MIPS implementation of the TargetRegisterInfo class.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "mips-reg-info"
#include "Mips.h"
+#include "MipsSubtarget.h"
#include "MipsRegisterInfo.h"
#include "MipsMachineFunction.h"
#include "llvm/Constants.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
-#include "llvm/CodeGen/MachineLocation.h"
-#include "llvm/Target/TargetFrameInfo.h"
+#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
-//#include "MipsSubtarget.h"
+#include "llvm/Analysis/DebugInfo.h"
-using namespace llvm;
-
-// TODO: add subtarget support
-MipsRegisterInfo::MipsRegisterInfo(const TargetInstrInfo &tii)
- : MipsGenRegisterInfo(Mips::ADJCALLSTACKDOWN, Mips::ADJCALLSTACKUP),
- TII(tii) {}
+#define GET_REGINFO_TARGET_DESC
+#include "MipsGenRegisterInfo.inc"
-void MipsRegisterInfo::
-storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
- unsigned SrcReg, int FI,
- const TargetRegisterClass *RC) const
-{
- if (RC == Mips::CPURegsRegisterClass)
- BuildMI(MBB, I, TII.get(Mips::SW)).addReg(SrcReg, false, false, true)
- .addImm(0).addFrameIndex(FI);
- else
- assert(0 && "Can't store this register to stack slot");
-}
+using namespace llvm;
-void MipsRegisterInfo::
-loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
- unsigned DestReg, int FI,
- const TargetRegisterClass *RC) const
-{
- if (RC == Mips::CPURegsRegisterClass)
- BuildMI(MBB, I, TII.get(Mips::LW), DestReg).addImm(0).addFrameIndex(FI);
- else
- assert(0 && "Can't load this register from stack slot");
-}
+MipsRegisterInfo::MipsRegisterInfo(const MipsSubtarget &ST,
+ const TargetInstrInfo &tii)
+ : MipsGenRegisterInfo(Mips::RA), Subtarget(ST), TII(tii) {}
-void MipsRegisterInfo::
-copyRegToReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
- unsigned DestReg, unsigned SrcReg,
- const TargetRegisterClass *RC) const
+/// getRegisterNumbering - Given the enum value for some register, e.g.
+/// Mips::RA, return the number that it corresponds to (e.g. 31).
+unsigned MipsRegisterInfo::
+getRegisterNumbering(unsigned RegEnum)
{
- if (RC == Mips::CPURegsRegisterClass)
- BuildMI(MBB, I, TII.get(Mips::ADDu), DestReg).addReg(Mips::ZERO)
- .addReg(SrcReg);
- else
- assert (0 && "Can't copy this register");
+ switch (RegEnum) {
+ case Mips::ZERO : case Mips::F0 : case Mips::D0 : return 0;
+ case Mips::AT : case Mips::F1 : return 1;
+ case Mips::V0 : case Mips::F2 : case Mips::D1 : return 2;
+ case Mips::V1 : case Mips::F3 : return 3;
+ case Mips::A0 : case Mips::F4 : case Mips::D2 : return 4;
+ case Mips::A1 : case Mips::F5 : return 5;
+ case Mips::A2 : case Mips::F6 : case Mips::D3 : return 6;
+ case Mips::A3 : case Mips::F7 : return 7;
+ case Mips::T0 : case Mips::F8 : case Mips::D4 : return 8;
+ case Mips::T1 : case Mips::F9 : return 9;
+ case Mips::T2 : case Mips::F10: case Mips::D5: return 10;
+ case Mips::T3 : case Mips::F11: return 11;
+ case Mips::T4 : case Mips::F12: case Mips::D6: return 12;
+ 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::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;
+ case Mips::SP : case Mips::F29: return 29;
+ case Mips::FP : case Mips::F30: case Mips::D15: return 30;
+ case Mips::RA : case Mips::F31: return 31;
+ default: llvm_unreachable("Unknown register number!");
+ }
+ return 0; // Not reached
}
-void MipsRegisterInfo::reMaterialize(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator I,
- unsigned DestReg,
- const MachineInstr *Orig) const
-{
- MachineInstr *MI = Orig->clone();
- MI->getOperand(0).setReg(DestReg);
- MBB.insert(I, MI);
-}
+unsigned MipsRegisterInfo::getPICCallReg() { return Mips::T9; }
-MachineInstr *MipsRegisterInfo::
-foldMemoryOperand(MachineInstr* MI, unsigned OpNum, int FI) const
-{
- MachineInstr *NewMI = NULL;
-
- switch (MI->getOpcode())
- {
- case Mips::ADDu:
- if ((MI->getOperand(0).isRegister()) &&
- (MI->getOperand(1).isRegister()) &&
- (MI->getOperand(1).getReg() == Mips::ZERO) &&
- (MI->getOperand(2).isRegister()))
- {
- if (OpNum == 0) // COPY -> STORE
- NewMI = BuildMI(TII.get(Mips::SW)).addFrameIndex(FI)
- .addImm(0).addReg(MI->getOperand(2).getReg());
- else // COPY -> LOAD
- NewMI = BuildMI(TII.get(Mips::LW), MI->getOperand(0)
- .getReg()).addImm(0).addFrameIndex(FI);
- }
- break;
- }
-
- if (NewMI)
- NewMI->copyKillDeadInfo(MI);
- return NewMI;
-}
+//===----------------------------------------------------------------------===//
+// Callee Saved Registers methods
+//===----------------------------------------------------------------------===//
/// Mips Callee Saved Registers
const unsigned* MipsRegisterInfo::
-getCalleeSavedRegs(const MachineFunction *MF) const
+getCalleeSavedRegs(const MachineFunction *MF) const
{
- // Mips calle-save register range is $16-$26(s0-s7)
- static const unsigned CalleeSavedRegs[] = {
- Mips::S0, Mips::S1, Mips::S2, Mips::S3,
- Mips::S4, Mips::S5, Mips::S6, Mips::S7, 0
+ // Mips callee-save register range is $16-$23, $f20-$f30
+ static const unsigned SingleFloatOnlyCalleeSavedRegs[] = {
+ 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
};
- return CalleeSavedRegs;
-}
-/// Mips Callee Saved Register Classes
-const TargetRegisterClass* const*
-MipsRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const
-{
- static const TargetRegisterClass * const CalleeSavedRegClasses[] = {
- &Mips::CPURegsRegClass, &Mips::CPURegsRegClass,
- &Mips::CPURegsRegClass, &Mips::CPURegsRegClass,
- &Mips::CPURegsRegClass, &Mips::CPURegsRegClass,
- &Mips::CPURegsRegClass, &Mips::CPURegsRegClass, 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
};
- return CalleeSavedRegClasses;
+
+ if (Subtarget.isSingleFloat())
+ return SingleFloatOnlyCalleeSavedRegs;
+ else
+ return Mips32CalleeSavedRegs;
}
BitVector MipsRegisterInfo::
-getReservedRegs(const MachineFunction &MF) const
-{
+getReservedRegs(const MachineFunction &MF) const {
BitVector Reserved(getNumRegs());
Reserved.set(Mips::ZERO);
Reserved.set(Mips::AT);
Reserved.set(Mips::SP);
Reserved.set(Mips::FP);
Reserved.set(Mips::RA);
- return Reserved;
-}
-
-//===----------------------------------------------------------------------===//
-//
-// Stack Frame Processing methods
-// +----------------------------+
-//
-// Too meet ABI, we construct the frame on the reverse
-// of natural order.
-//
-// The LLVM Frame will look like this:
-//
-// As the stack grows down, we start at 0, and the reference
-// is decrement.
-//
-// 0 ----------
-// -4 Args to pass
-// . saved "Callee Saved" Registers
-// . Local Area
-// . saved FP
-// . saved RA
-// -StackSize -----------
-//
-// On the EliminateFrameIndex we just negate the address above
-// and we get the stack frame required by the ABI, which is:
-//
-// sp + stacksize -------------
-// saved $RA (only on non-leaf functions)
-// saved $FP (only with frame pointer)
-// saved "Callee Saved" Registers
-// Local Area
-// saved $GP (used in PIC - not supported yet)
-// Args to pass area
-// sp -------------
-//
-// The sp is the stack pointer subtracted/added from the stack size
-// at the Prologue/Epilogue
-//
-// References to the previous stack (to obtain arguments) are done
-// with fixed location stack frames using positive stack offsets.
-//
-// Examples:
-// - reference to the actual stack frame
-// for any local area var there is smt like : FI >= 0, StackOffset: -4
-// sw REGX, 4(REGY)
-//
-// - reference to previous stack frame
-// suppose there's a store to the 5th arguments : FI < 0, StackOffset: 16.
-// The emitted instruction will be something like:
-// sw REGX, 16+StackSize (REGY)
-//
-//===----------------------------------------------------------------------===//
-// hasFP - Return true if the specified function should have a dedicated frame
-// pointer register. This is true if the function has variable sized allocas or
-// if frame pointer elimination is disabled.
-bool MipsRegisterInfo::
-hasFP(const MachineFunction &MF) const {
- return (NoFramePointerElim || MF.getFrameInfo()->hasVarSizedObjects());
+ return Reserved;
}
-// This function eliminate ADJCALLSTACKDOWN,
+// This function eliminate ADJCALLSTACKDOWN,
// ADJCALLSTACKUP pseudo instructions
void MipsRegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
// We must replace FrameIndex with an stack/frame pointer
// direct reference.
void MipsRegisterInfo::
-eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
- RegScavenger *RS) const
-{
- MachineInstr &MI = *II;
+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<MipsFunctionInfo>();
unsigned i = 0;
- while (!MI.getOperand(i).isFrameIndex()) {
+ while (!MI.getOperand(i).isFI()) {
++i;
- assert(i < MI.getNumOperands() &&
+ assert(i < MI.getNumOperands() &&
"Instr doesn't have FrameIndex operand!");
}
- int FrameIndex = MI.getOperand(i).getFrameIndex();
+ DEBUG(errs() << "\nFunction : " << MF.getFunction()->getName() << "\n";
+ errs() << "<--------->\n" << MI);
+
+ int FrameIndex = MI.getOperand(i).getIndex();
int stackSize = MF.getFrameInfo()->getStackSize();
int spOffset = MF.getFrameInfo()->getObjectOffset(FrameIndex);
- #ifndef NDEBUG
- DOUT << "\nFunction : " << MF.getFunction()->getName() << "\n";
- DOUT << "<--------->\n";
- MI.print(DOUT);
- DOUT << "FrameIndex : " << FrameIndex << "\n";
- DOUT << "spOffset : " << spOffset << "\n";
- DOUT << "stackSize : " << stackSize << "\n";
- #endif
-
- int Offset = ( (spOffset >= 0) ? (stackSize + spOffset) : (-spOffset));
-
- #ifndef NDEBUG
- DOUT << "Offset : " << Offset << "\n";
- DOUT << "<--------->\n";
- #endif
-
- MI.getOperand(i-1).ChangeToImmediate(Offset);
- MI.getOperand(i).ChangeToRegister(getFrameRegister(MF),false);
-}
-
-void MipsRegisterInfo::
-emitPrologue(MachineFunction &MF) const
-{
- MachineBasicBlock &MBB = MF.front();
- MachineFrameInfo *MFI = MF.getFrameInfo();
- MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
- MachineBasicBlock::iterator MBBI = MBB.begin();
-
- // Get the number of bytes to allocate from the FrameInfo
- int NumBytes = (int) MFI->getStackSize();
+ DEBUG(errs() << "FrameIndex : " << FrameIndex << "\n"
+ << "spOffset : " << spOffset << "\n"
+ << "stackSize : " << stackSize << "\n");
- #ifndef NDEBUG
- DOUT << "\n<--- EMIT PROLOGUE --->";
- DOUT << "Stack size :" << NumBytes << "\n";
- #endif
+ const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
+ int MinCSFI = 0;
+ int MaxCSFI = -1;
- // Do we need to allocate space on the stack?
- if (NumBytes == 0) return;
+ if (CSI.size()) {
+ MinCSFI = CSI[0].getFrameIdx();
+ MaxCSFI = CSI[CSI.size() - 1].getFrameIdx();
+ }
- int FPOffset, RAOffset;
+ // 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);
- // Always allocate space for saved RA and FP,
- // even if FramePointer is not used. When not
- // using FP, the last stack slot becomes empty
- // and RA is saved before it.
- if ((hasFP(MF)) && (MFI->hasCalls())) {
- FPOffset = NumBytes;
- RAOffset = (NumBytes+4);
- } else if ((!hasFP(MF)) && (MFI->hasCalls())) {
- FPOffset = 0;
- RAOffset = NumBytes;
- } else if ((hasFP(MF)) && (!MFI->hasCalls())) {
- FPOffset = NumBytes;
- RAOffset = 0;
- }
+ // 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;
- MFI->setObjectOffset(MFI->CreateStackObject(4,4), -FPOffset);
- MFI->setObjectOffset(MFI->CreateStackObject(4,4), -RAOffset);
- MipsFI->setFPStackOffset(FPOffset);
- MipsFI->setRAStackOffset(RAOffset);
-
- #ifndef NDEBUG
- DOUT << "FPOffset :" << FPOffset << "\n";
- DOUT << "RAOffset :" << RAOffset << "\n";
- #endif
-
- // Align stack.
- NumBytes += 8;
- unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
- NumBytes = ((NumBytes+Align-1)/Align*Align);
-
- #ifndef NDEBUG
- DOUT << "New stack size :" << NumBytes << "\n\n";
- #endif
-
- // Update frame info
- MFI->setStackSize(NumBytes);
-
- // Adjust stack : addi sp, sp, (-imm)
- BuildMI(MBB, MBBI, TII.get(Mips::ADDiu), Mips::SP)
- .addReg(Mips::SP).addImm(-NumBytes);
-
- // Save the return address only if the function isnt a leaf one.
- // sw $ra, stack_loc($sp)
- if (MFI->hasCalls()) {
- BuildMI(MBB, MBBI, TII.get(Mips::SW))
- .addReg(Mips::RA).addImm(RAOffset).addReg(Mips::SP);
- }
+ Offset += MI.getOperand(i+1).getImm();
- // if framepointer enabled, save it and set it
- // to point to the stack pointer
- if (hasFP(MF)) {
- // sw $fp,stack_loc($sp)
- BuildMI(MBB, MBBI, TII.get(Mips::SW))
- .addReg(Mips::FP).addImm(FPOffset).addReg(Mips::SP);
+ DEBUG(errs() << "Offset : " << Offset << "\n" << "<--------->\n");
- // move $fp, $sp
- BuildMI(MBB, MBBI, TII.get(Mips::ADDu), Mips::FP)
- .addReg(Mips::SP).addReg(Mips::ZERO);
- }
-}
+ // 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 ImmHi = (((unsigned)Offset & 0xffff0000) >> 16) +
+ ((Offset & 0x8000) != 0);
-void MipsRegisterInfo::
-emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const
-{
- MachineBasicBlock::iterator MBBI = prior(MBB.end());
- MachineFrameInfo *MFI = MF.getFrameInfo();
- MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
-
- // Get the number of bytes from FrameInfo
- int NumBytes = (int) MFI->getStackSize();
-
- // Get the FI's where RA and FP are saved.
- int FPOffset = MipsFI->getFPStackOffset();
- int RAOffset = MipsFI->getRAStackOffset();
-
- #ifndef NDEBUG
- DOUT << "\n<--- EMIT EPILOGUE --->" << "\n";
- DOUT << "Stack size :" << NumBytes << "\n";
- DOUT << "FPOffset :" << FPOffset << "\n";
- DOUT << "RAOffset :" << RAOffset << "\n\n";
- #endif
-
- // if framepointer enabled, restore it and restore the
- // stack pointer
- if (hasFP(MF)) {
- // move $sp, $fp
- BuildMI(MBB, MBBI, TII.get(Mips::ADDu), Mips::SP)
- .addReg(Mips::FP).addReg(Mips::ZERO);
-
- // lw $fp,stack_loc($sp)
- BuildMI(MBB, MBBI, TII.get(Mips::LW))
- .addReg(Mips::FP).addImm(FPOffset).addReg(Mips::SP);
- }
+ // 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(FrameReg)
+ .addReg(Mips::AT);
+ FrameReg = Mips::AT;
+ Offset = (short)(Offset & 0xffff);
- // Restore the return address only if the function isnt a leaf one.
- // lw $ra, stack_loc($sp)
- if (MFI->hasCalls()) {
- BuildMI(MBB, MBBI, TII.get(Mips::LW))
- .addReg(Mips::RA).addImm(RAOffset).addReg(Mips::SP);
+ BuildMI(MBB, ++II, MI.getDebugLoc(), TII.get(Mips::ATMACRO));
}
- // adjust stack : insert addi sp, sp, (imm)
- if (NumBytes) {
- BuildMI(MBB, MBBI, TII.get(Mips::ADDiu), Mips::SP)
- .addReg(Mips::SP).addImm(NumBytes);
- }
-}
-
-void MipsRegisterInfo::
-processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
+ MI.getOperand(i).ChangeToRegister(FrameReg, false);
+ MI.getOperand(i+1).ChangeToImmediate(Offset);
}
unsigned MipsRegisterInfo::
-getRARegister() const {
- return Mips::RA;
-}
+getFrameRegister(const MachineFunction &MF) const {
+ const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
-unsigned MipsRegisterInfo::
-getFrameRegister(MachineFunction &MF) const {
- return hasFP(MF) ? Mips::FP : Mips::SP;
+ return TFI->hasFP(MF) ? Mips::FP : Mips::SP;
}
unsigned MipsRegisterInfo::
getEHExceptionRegister() const {
- assert(0 && "What is the exception register");
+ llvm_unreachable("What is the exception register");
return 0;
}
unsigned MipsRegisterInfo::
getEHHandlerRegister() const {
- assert(0 && "What is the exception handler register");
+ llvm_unreachable("What is the exception handler register");
return 0;
}
-
-#include "MipsGenRegisterInfo.inc"
-