-//===- ARMBaseRegisterInfo.cpp - ARM Register Information -------*- C++ -*-===//
+//===-- ARMBaseRegisterInfo.cpp - ARM Register Information ----------------===//
//
// The LLVM Compiler Infrastructure
//
const unsigned*
ARMBaseRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
- static const unsigned CalleeSavedRegs[] = {
- ARM::LR, ARM::R11, ARM::R10, ARM::R9, ARM::R8,
- ARM::R7, ARM::R6, ARM::R5, ARM::R4,
-
- ARM::D15, ARM::D14, ARM::D13, ARM::D12,
- ARM::D11, ARM::D10, ARM::D9, ARM::D8,
- 0
- };
-
- static const unsigned DarwinCalleeSavedRegs[] = {
- // Darwin ABI deviates from ARM standard ABI. R9 is not a callee-saved
- // register.
- ARM::LR, ARM::R7, ARM::R6, ARM::R5, ARM::R4,
- ARM::R11, ARM::R10, ARM::R8,
+ return (STI.isTargetIOS()) ? CSR_iOS_SaveList : CSR_AAPCS_SaveList;
+}
- ARM::D15, ARM::D14, ARM::D13, ARM::D12,
- ARM::D11, ARM::D10, ARM::D9, ARM::D8,
- 0
- };
- return STI.isTargetDarwin() ? DarwinCalleeSavedRegs : CalleeSavedRegs;
+const uint32_t*
+ARMBaseRegisterInfo::getCallPreservedMask(CallingConv::ID) const {
+ return (STI.isTargetIOS()) ? CSR_iOS_RegMask : CSR_AAPCS_RegMask;
}
BitVector ARMBaseRegisterInfo::
BitVector Reserved(getNumRegs());
Reserved.set(ARM::SP);
Reserved.set(ARM::PC);
- Reserved.set(ARM::FPSCR);
if (TFI->hasFP(MF))
Reserved.set(FramePtr);
if (hasBasePointer(MF))
return false;
}
-const TargetRegisterClass *
-ARMBaseRegisterInfo::getMatchingSuperRegClass(const TargetRegisterClass *A,
- const TargetRegisterClass *B,
- unsigned SubIdx) const {
- switch (SubIdx) {
- default: return 0;
- case ARM::ssub_0:
- case ARM::ssub_1:
- case ARM::ssub_2:
- case ARM::ssub_3: {
- // S sub-registers.
- if (A->getSize() == 8) {
- if (B == &ARM::SPR_8RegClass)
- return &ARM::DPR_8RegClass;
- assert(B == &ARM::SPRRegClass && "Expecting SPR register class!");
- if (A == &ARM::DPR_8RegClass)
- return A;
- return &ARM::DPR_VFP2RegClass;
- }
-
- if (A->getSize() == 16) {
- if (B == &ARM::SPR_8RegClass)
- return &ARM::QPR_8RegClass;
- return &ARM::QPR_VFP2RegClass;
- }
-
- if (A->getSize() == 32) {
- if (B == &ARM::SPR_8RegClass)
- return 0; // Do not allow coalescing!
- return &ARM::QQPR_VFP2RegClass;
- }
-
- assert(A->getSize() == 64 && "Expecting a QQQQ register class!");
- return 0; // Do not allow coalescing!
- }
- case ARM::dsub_0:
- case ARM::dsub_1:
- case ARM::dsub_2:
- case ARM::dsub_3: {
- // D sub-registers.
- if (A->getSize() == 16) {
- if (B == &ARM::DPR_VFP2RegClass)
- return &ARM::QPR_VFP2RegClass;
- if (B == &ARM::DPR_8RegClass)
- return 0; // Do not allow coalescing!
- return A;
- }
-
- if (A->getSize() == 32) {
- if (B == &ARM::DPR_VFP2RegClass)
- return &ARM::QQPR_VFP2RegClass;
- if (B == &ARM::DPR_8RegClass)
- return 0; // Do not allow coalescing!
- return A;
- }
-
- assert(A->getSize() == 64 && "Expecting a QQQQ register class!");
- if (B != &ARM::DPRRegClass)
- return 0; // Do not allow coalescing!
- return A;
- }
- case ARM::dsub_4:
- case ARM::dsub_5:
- case ARM::dsub_6:
- case ARM::dsub_7: {
- // D sub-registers of QQQQ registers.
- if (A->getSize() == 64 && B == &ARM::DPRRegClass)
- return A;
- return 0; // Do not allow coalescing!
- }
-
- case ARM::qsub_0:
- case ARM::qsub_1: {
- // Q sub-registers.
- if (A->getSize() == 32) {
- if (B == &ARM::QPR_VFP2RegClass)
- return &ARM::QQPR_VFP2RegClass;
- if (B == &ARM::QPR_8RegClass)
- return 0; // Do not allow coalescing!
- return A;
- }
-
- assert(A->getSize() == 64 && "Expecting a QQQQ register class!");
- if (B == &ARM::QPRRegClass)
- return A;
- return 0; // Do not allow coalescing!
- }
- case ARM::qsub_2:
- case ARM::qsub_3: {
- // Q sub-registers of QQQQ registers.
- if (A->getSize() == 64 && B == &ARM::QPRRegClass)
- return A;
- return 0; // Do not allow coalescing!
- }
- }
- return 0;
-}
-
bool
ARMBaseRegisterInfo::canCombineSubRegIndices(const TargetRegisterClass *RC,
SmallVectorImpl<unsigned> &SubIndices,
bool ARMBaseRegisterInfo::canRealignStack(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
+ const MachineRegisterInfo *MRI = &MF.getRegInfo();
const ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
// We can't realign the stack if:
// 1. Dynamic stack realignment is explicitly disabled,
// 2. This is a Thumb1 function (it's not useful, so we don't bother), or
// 3. There are VLAs in the function and the base pointer is disabled.
- return (RealignStack && !AFI->isThumb1OnlyFunction() &&
- (!MFI->hasVarSizedObjects() || EnableBasePointer));
+ if (!MF.getTarget().Options.RealignStack)
+ return false;
+ if (AFI->isThumb1OnlyFunction())
+ return false;
+ // Stack realignment requires a frame pointer. If we already started
+ // register allocation with frame pointer elimination, it is too late now.
+ if (!MRI->canReserveReg(FramePtr))
+ return false;
+ // We may also need a base pointer if there are dynamic allocas.
+ if (!MFI->hasVarSizedObjects())
+ return true;
+ if (!EnableBasePointer)
+ return false;
+ // A base pointer is required and allowed. Check that it isn't too late to
+ // reserve it.
+ return MRI->canReserveReg(BasePtr);
}
bool ARMBaseRegisterInfo::
const MachineFrameInfo *MFI = MF.getFrameInfo();
const Function *F = MF.getFunction();
unsigned StackAlign = MF.getTarget().getFrameLowering()->getStackAlignment();
- bool requiresRealignment = ((MFI->getLocalFrameMaxAlign() > StackAlign) ||
+ bool requiresRealignment = ((MFI->getMaxAlignment() > StackAlign) ||
F->hasFnAttr(Attribute::StackAlignment));
return requiresRealignment && canRealignStack(MF);
bool ARMBaseRegisterInfo::
cannotEliminateFrame(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
- if (DisableFramePointerElim(MF) && MFI->adjustsStack())
+ if (MF.getTarget().Options.DisableFramePointerElim(MF) && MFI->adjustsStack())
return true;
return MFI->hasVarSizedObjects() || MFI->isFrameAddressTaken()
|| needsStackRealignment(MF);
unsigned ARMBaseRegisterInfo::getEHExceptionRegister() const {
llvm_unreachable("What is the exception register");
- return 0;
}
unsigned ARMBaseRegisterInfo::getEHHandlerRegister() const {
llvm_unreachable("What is the exception handler register");
- return 0;
}
unsigned ARMBaseRegisterInfo::getRegisterPairEven(unsigned Reg,
getFrameIndexInstrOffset(const MachineInstr *MI, int Idx) const {
const MCInstrDesc &Desc = MI->getDesc();
unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
- int64_t InstrOffs = 0;;
+ int64_t InstrOffs = 0;
int Scale = 1;
unsigned ImmIdx = 0;
switch (AddrMode) {
}
default:
llvm_unreachable("Unsupported addressing mode!");
- break;
}
return InstrOffs * Scale;
break;
default:
llvm_unreachable("Unsupported addressing mode!");
- break;
}
Offset += getFrameIndexInstrOffset(MI, i);
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