//===----------------------------------------------------------------------===//
#include "Mips16FrameLowering.h"
-#include "MipsInstrInfo.h"
#include "MCTargetDesc/MipsBaseInfo.h"
-#include "llvm/Function.h"
+#include "Mips16InstrInfo.h"
+#include "MipsInstrInfo.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
-#include "llvm/DataLayout.h"
-#include "llvm/Target/TargetOptions.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Function.h"
#include "llvm/Support/CommandLine.h"
+#include "llvm/Target/TargetOptions.h"
using namespace llvm;
void Mips16FrameLowering::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front();
MachineFrameInfo *MFI = MF.getFrameInfo();
- const MipsInstrInfo &TII =
- *static_cast<const MipsInstrInfo*>(MF.getTarget().getInstrInfo());
+ const Mips16InstrInfo &TII =
+ *static_cast<const Mips16InstrInfo*>(MF.getTarget().getInstrInfo());
MachineBasicBlock::iterator MBBI = MBB.begin();
DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
uint64_t StackSize = MFI->getStackSize();
// No need to allocate space on the stack.
if (StackSize == 0 && !MFI->adjustsStack()) return;
+ MachineModuleInfo &MMI = MF.getMMI();
+ const MCRegisterInfo *MRI = MMI.getContext().getRegisterInfo();
+ MachineLocation DstML, SrcML;
+
// Adjust stack.
- if (isInt<16>(-StackSize))
- BuildMI(MBB, MBBI, dl, TII.get(Mips::SaveRaF16)).addImm(StackSize);
+ TII.makeFrame(Mips::SP, StackSize, MBB, MBBI);
+
+ // emit ".cfi_def_cfa_offset StackSize"
+ MCSymbol *AdjustSPLabel = MMI.getContext().CreateTempSymbol();
+ BuildMI(MBB, MBBI, dl,
+ TII.get(TargetOpcode::PROLOG_LABEL)).addSym(AdjustSPLabel);
+ MMI.addFrameInst(
+ MCCFIInstruction::createDefCfaOffset(AdjustSPLabel, -StackSize));
+
+ MCSymbol *CSLabel = MMI.getContext().CreateTempSymbol();
+ BuildMI(MBB, MBBI, dl,
+ TII.get(TargetOpcode::PROLOG_LABEL)).addSym(CSLabel);
+ unsigned S2 = MRI->getDwarfRegNum(Mips::S2, true);
+ MMI.addFrameInst(MCCFIInstruction::createOffset(CSLabel, S2, -8));
+
+ unsigned S1 = MRI->getDwarfRegNum(Mips::S1, true);
+ MMI.addFrameInst(MCCFIInstruction::createOffset(CSLabel, S1, -12));
+
+ unsigned S0 = MRI->getDwarfRegNum(Mips::S0, true);
+ MMI.addFrameInst(MCCFIInstruction::createOffset(CSLabel, S0, -16));
+
+ unsigned RA = MRI->getDwarfRegNum(Mips::RA, true);
+ MMI.addFrameInst(MCCFIInstruction::createOffset(CSLabel, RA, -4));
+
+ if (hasFP(MF))
+ BuildMI(MBB, MBBI, dl, TII.get(Mips::MoveR3216), Mips::S0)
+ .addReg(Mips::SP);
+
}
void Mips16FrameLowering::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
MachineFrameInfo *MFI = MF.getFrameInfo();
- const MipsInstrInfo &TII =
- *static_cast<const MipsInstrInfo*>(MF.getTarget().getInstrInfo());
+ const Mips16InstrInfo &TII =
+ *static_cast<const Mips16InstrInfo*>(MF.getTarget().getInstrInfo());
DebugLoc dl = MBBI->getDebugLoc();
uint64_t StackSize = MFI->getStackSize();
if (!StackSize)
return;
+ if (hasFP(MF))
+ BuildMI(MBB, MBBI, dl, TII.get(Mips::Move32R16), Mips::SP)
+ .addReg(Mips::S0);
+
// Adjust stack.
- if (isInt<16>(StackSize))
- // assumes stacksize multiple of 8
- BuildMI(MBB, MBBI, dl, TII.get(Mips::RestoreRaF16)).addImm(StackSize);
+ // assumes stacksize multiple of 8
+ TII.restoreFrame(Mips::SP, StackSize, MBB, MBBI);
}
bool Mips16FrameLowering::
return true;
}
+// Eliminate ADJCALLSTACKDOWN, ADJCALLSTACKUP pseudo instructions
+void Mips16FrameLowering::
+eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I) const {
+ if (!hasReservedCallFrame(MF)) {
+ int64_t Amount = I->getOperand(0).getImm();
+
+ if (I->getOpcode() == Mips::ADJCALLSTACKDOWN)
+ Amount = -Amount;
+
+ const Mips16InstrInfo &TII =
+ *static_cast<const Mips16InstrInfo*>(MF.getTarget().getInstrInfo());
+
+ TII.adjustStackPtr(Mips::SP, Amount, MBB, I);
+ }
+
+ MBB.erase(I);
+}
+
bool
Mips16FrameLowering::hasReservedCallFrame(const MachineFunction &MF) const {
- // FIXME: implement.
- return true;
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ // Reserve call frame if the size of the maximum call frame fits into 15-bit
+ // immediate field and there are no variable sized objects on the stack.
+ return isInt<15>(MFI->getMaxCallFrameSize()) && !MFI->hasVarSizedObjects();
}
void Mips16FrameLowering::
MF.getRegInfo().setPhysRegUsed(Mips::RA);
MF.getRegInfo().setPhysRegUsed(Mips::S0);
MF.getRegInfo().setPhysRegUsed(Mips::S1);
+ MF.getRegInfo().setPhysRegUsed(Mips::S2);
}
const MipsFrameLowering *