-//===- MipsRegisterInfo.cpp - MIPS Register Information -== ----*- C++ -*-===//
+//===- MipsRegisterInfo.cpp - MIPS Register Information -== -----*- C++ -*-===//
//
// 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 MIPS implementation of the TargetRegisterInfo class.
//
-//===---------------------------------------------------------------------===//
+//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "mips-reg-info"
#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"
#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).
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;
unsigned MipsRegisterInfo::getPICCallReg() { return Mips::T9; }
-//===---------------------------------------------------------------------===//
+//===----------------------------------------------------------------------===//
// Callee Saved Registers methods
-//===---------------------------------------------------------------------===//
+//===----------------------------------------------------------------------===//
/// Mips Callee Saved Registers
const unsigned* MipsRegisterInfo::
{
// 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::
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;
}
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).isFI()) {
<< "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<CalleeSavedInfo> &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<MipsFunctionInfo>();
- 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::
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"
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