-//======-- MSP430FrameLowering.cpp - MSP430 Frame Information -------=========//
+//===-- MSP430FrameLowering.cpp - MSP430 Frame Information ----------------===//
//
// The LLVM Compiler Infrastructure
//
#include "MSP430FrameLowering.h"
#include "MSP430InstrInfo.h"
#include "MSP430MachineFunctionInfo.h"
-#include "llvm/Function.h"
+#include "MSP430Subtarget.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/Target/TargetData.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;
return !MF.getFrameInfo()->hasVarSizedObjects();
}
-void MSP430FrameLowering::emitPrologue(MachineFunction &MF) const {
- MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
+void MSP430FrameLowering::emitPrologue(MachineFunction &MF,
+ MachineBasicBlock &MBB) const {
+ assert(&MF.front() == &MBB && "Shrink-wrapping not yet supported");
MachineFrameInfo *MFI = MF.getFrameInfo();
MSP430MachineFunctionInfo *MSP430FI = MF.getInfo<MSP430MachineFunctionInfo>();
const MSP430InstrInfo &TII =
- *static_cast<const MSP430InstrInfo*>(MF.getTarget().getInstrInfo());
+ *static_cast<const MSP430InstrInfo *>(MF.getSubtarget().getInstrInfo());
MachineBasicBlock::iterator MBBI = MBB.begin();
DebugLoc DL = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
// Update the frame offset adjustment.
MFI->setOffsetAdjustment(-NumBytes);
- // Save FPW into the appropriate stack slot...
+ // Save FP into the appropriate stack slot...
BuildMI(MBB, MBBI, DL, TII.get(MSP430::PUSH16r))
- .addReg(MSP430::FPW, RegState::Kill);
+ .addReg(MSP430::FP, RegState::Kill);
- // Update FPW with the new base value...
- BuildMI(MBB, MBBI, DL, TII.get(MSP430::MOV16rr), MSP430::FPW)
- .addReg(MSP430::SPW);
+ // Update FP with the new base value...
+ BuildMI(MBB, MBBI, DL, TII.get(MSP430::MOV16rr), MSP430::FP)
+ .addReg(MSP430::SP);
// Mark the FramePtr as live-in in every block except the entry.
- for (MachineFunction::iterator I = llvm::next(MF.begin()), E = MF.end();
+ for (MachineFunction::iterator I = std::next(MF.begin()), E = MF.end();
I != E; ++I)
- I->addLiveIn(MSP430::FPW);
+ I->addLiveIn(MSP430::FP);
} else
NumBytes = StackSize - MSP430FI->getCalleeSavedFrameSize();
if (MBBI != MBB.end())
DL = MBBI->getDebugLoc();
- if (NumBytes) { // adjust stack pointer: SPW -= numbytes
- // If there is an SUB16ri of SPW immediately before this instruction, merge
+ if (NumBytes) { // adjust stack pointer: SP -= numbytes
+ // If there is an SUB16ri of SP immediately before this instruction, merge
// the two.
//NumBytes -= mergeSPUpdates(MBB, MBBI, true);
- // If there is an ADD16ri or SUB16ri of SPW immediately after this
+ // If there is an ADD16ri or SUB16ri of SP immediately after this
// instruction, merge the two instructions.
// mergeSPUpdatesDown(MBB, MBBI, &NumBytes);
if (NumBytes) {
MachineInstr *MI =
- BuildMI(MBB, MBBI, DL, TII.get(MSP430::SUB16ri), MSP430::SPW)
- .addReg(MSP430::SPW).addImm(NumBytes);
+ BuildMI(MBB, MBBI, DL, TII.get(MSP430::SUB16ri), MSP430::SP)
+ .addReg(MSP430::SP).addImm(NumBytes);
// The SRW implicit def is dead.
MI->getOperand(3).setIsDead();
}
const MachineFrameInfo *MFI = MF.getFrameInfo();
MSP430MachineFunctionInfo *MSP430FI = MF.getInfo<MSP430MachineFunctionInfo>();
const MSP430InstrInfo &TII =
- *static_cast<const MSP430InstrInfo*>(MF.getTarget().getInstrInfo());
+ *static_cast<const MSP430InstrInfo *>(MF.getSubtarget().getInstrInfo());
MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
unsigned RetOpcode = MBBI->getOpcode();
uint64_t FrameSize = StackSize - 2;
NumBytes = FrameSize - CSSize;
- // pop FPW.
- BuildMI(MBB, MBBI, DL, TII.get(MSP430::POP16r), MSP430::FPW);
+ // pop FP.
+ BuildMI(MBB, MBBI, DL, TII.get(MSP430::POP16r), MSP430::FP);
} else
NumBytes = StackSize - CSSize;
// Skip the callee-saved pop instructions.
while (MBBI != MBB.begin()) {
- MachineBasicBlock::iterator PI = prior(MBBI);
+ MachineBasicBlock::iterator PI = std::prev(MBBI);
unsigned Opc = PI->getOpcode();
if (Opc != MSP430::POP16r && !PI->isTerminator())
break;
DL = MBBI->getDebugLoc();
- // If there is an ADD16ri or SUB16ri of SPW immediately before this
+ // If there is an ADD16ri or SUB16ri of SP immediately before this
// instruction, merge the two instructions.
//if (NumBytes || MFI->hasVarSizedObjects())
// mergeSPUpdatesUp(MBB, MBBI, StackPtr, &NumBytes);
if (MFI->hasVarSizedObjects()) {
BuildMI(MBB, MBBI, DL,
- TII.get(MSP430::MOV16rr), MSP430::SPW).addReg(MSP430::FPW);
+ TII.get(MSP430::MOV16rr), MSP430::SP).addReg(MSP430::FP);
if (CSSize) {
MachineInstr *MI =
BuildMI(MBB, MBBI, DL,
- TII.get(MSP430::SUB16ri), MSP430::SPW)
- .addReg(MSP430::SPW).addImm(CSSize);
+ TII.get(MSP430::SUB16ri), MSP430::SP)
+ .addReg(MSP430::SP).addImm(CSSize);
// The SRW implicit def is dead.
MI->getOperand(3).setIsDead();
}
} else {
- // adjust stack pointer back: SPW += numbytes
+ // adjust stack pointer back: SP += numbytes
if (NumBytes) {
MachineInstr *MI =
- BuildMI(MBB, MBBI, DL, TII.get(MSP430::ADD16ri), MSP430::SPW)
- .addReg(MSP430::SPW).addImm(NumBytes);
+ BuildMI(MBB, MBBI, DL, TII.get(MSP430::ADD16ri), MSP430::SP)
+ .addReg(MSP430::SP).addImm(NumBytes);
// The SRW implicit def is dead.
MI->getOperand(3).setIsDead();
}
if (MI != MBB.end()) DL = MI->getDebugLoc();
MachineFunction &MF = *MBB.getParent();
- const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
+ const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
MSP430MachineFunctionInfo *MFI = MF.getInfo<MSP430MachineFunctionInfo>();
MFI->setCalleeSavedFrameSize(CSI.size() * 2);
if (MI != MBB.end()) DL = MI->getDebugLoc();
MachineFunction &MF = *MBB.getParent();
- const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
+ const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
for (unsigned i = 0, e = CSI.size(); i != e; ++i)
BuildMI(MBB, MI, DL, TII.get(MSP430::POP16r), CSI[i].getReg());
return true;
}
+
+void MSP430FrameLowering::
+eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I) const {
+ const MSP430InstrInfo &TII =
+ *static_cast<const MSP430InstrInfo *>(MF.getSubtarget().getInstrInfo());
+ unsigned StackAlign = getStackAlignment();
+
+ if (!hasReservedCallFrame(MF)) {
+ // If the stack pointer can be changed after prologue, turn the
+ // adjcallstackup instruction into a 'sub SP, <amt>' and the
+ // adjcallstackdown instruction into 'add SP, <amt>'
+ // 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 = nullptr;
+ if (Old->getOpcode() == TII.getCallFrameSetupOpcode()) {
+ New = BuildMI(MF, Old->getDebugLoc(),
+ TII.get(MSP430::SUB16ri), MSP430::SP)
+ .addReg(MSP430::SP).addImm(Amount);
+ } else {
+ assert(Old->getOpcode() == TII.getCallFrameDestroyOpcode());
+ // factor out the amount the callee already popped.
+ uint64_t CalleeAmt = Old->getOperand(1).getImm();
+ Amount -= CalleeAmt;
+ if (Amount)
+ New = BuildMI(MF, Old->getDebugLoc(),
+ TII.get(MSP430::ADD16ri), MSP430::SP)
+ .addReg(MSP430::SP).addImm(Amount);
+ }
+
+ if (New) {
+ // The SRW implicit def is dead.
+ New->getOperand(3).setIsDead();
+
+ // Replace the pseudo instruction with a new instruction...
+ MBB.insert(I, New);
+ }
+ }
+ } else if (I->getOpcode() == TII.getCallFrameDestroyOpcode()) {
+ // If we are performing frame pointer elimination and if the callee pops
+ // something off the stack pointer, add it back.
+ if (uint64_t CalleeAmt = I->getOperand(1).getImm()) {
+ MachineInstr *Old = I;
+ MachineInstr *New =
+ BuildMI(MF, Old->getDebugLoc(), TII.get(MSP430::SUB16ri),
+ MSP430::SP).addReg(MSP430::SP).addImm(CalleeAmt);
+ // The SRW implicit def is dead.
+ New->getOperand(3).setIsDead();
+
+ MBB.insert(I, New);
+ }
+ }
+
+ MBB.erase(I);
+}
+
+void
+MSP430FrameLowering::processFunctionBeforeFrameFinalized(MachineFunction &MF,
+ RegScavenger *) const {
+ // Create a frame entry for the FP register that must be saved.
+ if (hasFP(MF)) {
+ int FrameIdx = MF.getFrameInfo()->CreateFixedObject(2, -4, true);
+ (void)FrameIdx;
+ assert(FrameIdx == MF.getFrameInfo()->getObjectIndexBegin() &&
+ "Slot for FP register must be last in order to be found!");
+ }
+}
projects / oota-llvm.git / blobdiff