//
// For most functions, some of the frame areas are empty. For those functions,
// it may not be necessary to set up fp or bp:
-// * A base pointer is definitly needed when there are both VLAs and local
+// * A base pointer is definitely needed when there are both VLAs and local
// variables with more-than-default alignment requirements.
-// * A frame pointer is definitly needed when there are local variables with
+// * A frame pointer is definitely needed when there are local variables with
// more-than-default alignment requirements.
//
// In some cases when a base pointer is not strictly needed, it is generated
if (CSI.empty())
return;
- const DataLayout *TD = MF.getTarget().getDataLayout();
+ const DataLayout &TD = MF.getDataLayout();
bool HasFP = hasFP(MF);
// Calculate amount of bytes used for return address storing.
- int stackGrowth = -TD->getPointerSize(0);
+ int stackGrowth = -TD.getPointerSize(0);
// Calculate offsets.
int64_t saveAreaOffset = (HasFP ? 2 : 1) * stackGrowth;
MF.getSubtarget().getRegisterInfo());
const TargetInstrInfo *TII = MF.getSubtarget().getInstrInfo();
MachineModuleInfo &MMI = MF.getMMI();
- AArch64FunctionInfo *AFI = MF.getInfo<AArch64FunctionInfo>();
- bool needsFrameMoves = MMI.hasDebugInfo() || Fn->needsUnwindTableEntry();
- bool HasFP = hasFP(MF);
- DebugLoc DL = MBB.findDebugLoc(MBBI);
-
- // All calls are tail calls in GHC calling conv, and functions have no
- // prologue/epilogue.
+ AArch64FunctionInfo *AFI = MF.getInfo<AArch64FunctionInfo>();\r
+ bool needsFrameMoves = MMI.hasDebugInfo() || Fn->needsUnwindTableEntry();\r
+ bool HasFP = hasFP(MF);\r
+\r
+ // Debug location must be unknown since the first debug location is used\r
+ // to determine the end of the prologue.\r
+ DebugLoc DL;\r
+\r
+ // All calls are tail calls in GHC calling conv, and functions have no\r
+ // prologue/epilogue.\r
if (MF.getFunction()->getCallingConv() == CallingConv::GHC)
return;
if (NumBytes && NeedsRealignment) {
// Use the first callee-saved register as a scratch register.
scratchSPReg = AArch64::X9;
- MF.getRegInfo().setPhysRegUsed(scratchSPReg);
}
// If we're a leaf function, try using the red zone.
}
if (needsFrameMoves) {
- const DataLayout *TD = MF.getTarget().getDataLayout();
- const int StackGrowth = -TD->getPointerSize(0);
+ const DataLayout &TD = MF.getDataLayout();
+ const int StackGrowth = -TD.getPointerSize(0);
unsigned FramePtr = RegInfo->getFrameRegister(MF);
// An example of the prologue:
//
-(NumRestores - 1) * 16, TII, MachineInstr::NoFlags);
}
-/// getFrameIndexOffset - Returns the displacement from the frame register to
-/// the stack frame of the specified index.
-int AArch64FrameLowering::getFrameIndexOffset(const MachineFunction &MF,
- int FI) const {
- unsigned FrameReg;
- return getFrameIndexReference(MF, FI, FrameReg);
-}
-
/// getFrameIndexReference - Provide a base+offset reference to an FI slot for
/// debug info. It's the same as what we use for resolving the code-gen
/// references for now. FIXME: This can go wrong when references are
MachineFunction &MF = *MBB.getParent();
const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
unsigned Count = CSI.size();
- DebugLoc DL;
- assert((Count & 1) == 0 && "Odd number of callee-saved regs to spill!");
-
- if (MI != MBB.end())
- DL = MI->getDebugLoc();
-
- for (unsigned i = 0; i < Count; i += 2) {
- unsigned idx = Count - i - 2;
- unsigned Reg1 = CSI[idx].getReg();
+ DebugLoc DL;\r
+ assert((Count & 1) == 0 && "Odd number of callee-saved regs to spill!");\r
+\r
+ for (unsigned i = 0; i < Count; i += 2) {\r
+ unsigned idx = Count - i - 2;\r
+ unsigned Reg1 = CSI[idx].getReg();\r
unsigned Reg2 = CSI[idx + 1].getReg();
// GPRs and FPRs are saved in pairs of 64-bit regs. We expect the CSI
// list to come in sorted by frame index so that we can issue the store
return true;
}
-void AArch64FrameLowering::processFunctionBeforeCalleeSavedScan(
- MachineFunction &MF, RegScavenger *RS) const {
+void AArch64FrameLowering::determineCalleeSaves(MachineFunction &MF,
+ BitVector &SavedRegs,
+ RegScavenger *RS) const {
+ // All calls are tail calls in GHC calling conv, and functions have no
+ // prologue/epilogue.
+ if (MF.getFunction()->getCallingConv() == CallingConv::GHC)
+ return;
+
+ TargetFrameLowering::determineCalleeSaves(MF, SavedRegs, RS);
const AArch64RegisterInfo *RegInfo = static_cast<const AArch64RegisterInfo *>(
MF.getSubtarget().getRegisterInfo());
AArch64FunctionInfo *AFI = MF.getInfo<AArch64FunctionInfo>();
- MachineRegisterInfo *MRI = &MF.getRegInfo();
SmallVector<unsigned, 4> UnspilledCSGPRs;
SmallVector<unsigned, 4> UnspilledCSFPRs;
// The frame record needs to be created by saving the appropriate registers
if (hasFP(MF)) {
- MRI->setPhysRegUsed(AArch64::FP);
- MRI->setPhysRegUsed(AArch64::LR);
+ SavedRegs.set(AArch64::FP);
+ SavedRegs.set(AArch64::LR);
}
// Spill the BasePtr if it's used. Do this first thing so that the
// getCalleeSavedRegs() below will get the right answer.
if (RegInfo->hasBasePointer(MF))
- MRI->setPhysRegUsed(RegInfo->getBaseRegister());
+ SavedRegs.set(RegInfo->getBaseRegister());
if (RegInfo->needsStackRealignment(MF) && !RegInfo->hasBasePointer(MF))
- MRI->setPhysRegUsed(AArch64::X9);
+ SavedRegs.set(AArch64::X9);
// If any callee-saved registers are used, the frame cannot be eliminated.
unsigned NumGPRSpilled = 0;
unsigned NumFPRSpilled = 0;
bool ExtraCSSpill = false;
bool CanEliminateFrame = true;
- DEBUG(dbgs() << "*** processFunctionBeforeCalleeSavedScan\nUsed CSRs:");
+ DEBUG(dbgs() << "*** determineCalleeSaves\nUsed CSRs:");
const MCPhysReg *CSRegs = RegInfo->getCalleeSavedRegs(&MF);
// Check pairs of consecutive callee-saved registers.
AArch64::FPR64RegClass.contains(EvenReg)) &&
"Register class mismatch!");
- const bool OddRegUsed = MRI->isPhysRegUsed(OddReg);
- const bool EvenRegUsed = MRI->isPhysRegUsed(EvenReg);
+ const bool OddRegUsed = SavedRegs.test(OddReg);
+ const bool EvenRegUsed = SavedRegs.test(EvenReg);
// Early exit if none of the registers in the register pair is actually
// used.
if (OddRegUsed ^ EvenRegUsed) {
// Find out which register is the additional spill.
Reg = OddRegUsed ? EvenReg : OddReg;
- MRI->setPhysRegUsed(Reg);
+ SavedRegs.set(Reg);
}
DEBUG(dbgs() << ' ' << PrintReg(OddReg, RegInfo));
UnspilledCSGPRs.pop_back();
DEBUG(dbgs() << "Spilling " << PrintReg(Reg, RegInfo)
<< " to get a scratch register.\n");
- MRI->setPhysRegUsed(Reg);
+ SavedRegs.set(Reg);
ExtraCSSpill = true;
++Count;
}
projects / oota-llvm.git / blobdiff