#include "AArch64Subtarget.h"
#include "MCTargetDesc/AArch64AddressingModes.h"
#include "llvm/ADT/BitVector.h"
+#include "llvm/ADT/Triple.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#define GET_REGINFO_TARGET_DESC
#include "AArch64GenRegisterInfo.inc"
-AArch64RegisterInfo::AArch64RegisterInfo(const AArch64InstrInfo *tii,
- const AArch64Subtarget *sti)
- : AArch64GenRegisterInfo(AArch64::LR), TII(tii), STI(sti) {}
+static cl::opt<bool>
+ReserveX18("aarch64-reserve-x18", cl::Hidden,
+ cl::desc("Reserve X18, making it unavailable as GPR"));
+
+AArch64RegisterInfo::AArch64RegisterInfo(const Triple &TT)
+ : AArch64GenRegisterInfo(AArch64::LR), TT(TT) {}
const MCPhysReg *
AArch64RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
assert(MF && "Invalid MachineFunction pointer.");
+ if (MF->getFunction()->getCallingConv() == CallingConv::GHC)
+ // GHC set of callee saved regs is empty as all those regs are
+ // used for passing STG regs around
+ return CSR_AArch64_NoRegs_SaveList;
if (MF->getFunction()->getCallingConv() == CallingConv::AnyReg)
return CSR_AArch64_AllRegs_SaveList;
else
}
const uint32_t *
-AArch64RegisterInfo::getCallPreservedMask(CallingConv::ID CC) const {
+AArch64RegisterInfo::getCallPreservedMask(const MachineFunction &MF,
+ CallingConv::ID CC) const {
+ if (CC == CallingConv::GHC)
+ // This is academic becase all GHC calls are (supposed to be) tail calls
+ return CSR_AArch64_NoRegs_RegMask;
if (CC == CallingConv::AnyReg)
return CSR_AArch64_AllRegs_RegMask;
else
}
const uint32_t *AArch64RegisterInfo::getTLSCallPreservedMask() const {
- if (STI->isTargetDarwin())
+ if (TT.isOSDarwin())
return CSR_AArch64_TLS_Darwin_RegMask;
- assert(STI->isTargetELF() && "only expect Darwin or ELF TLS");
+ assert(TT.isOSBinFormatELF() && "only expect Darwin or ELF TLS");
return CSR_AArch64_TLS_ELF_RegMask;
}
const uint32_t *
-AArch64RegisterInfo::getThisReturnPreservedMask(CallingConv::ID) const {
+AArch64RegisterInfo::getThisReturnPreservedMask(const MachineFunction &MF,
+ CallingConv::ID CC) const {
// This should return a register mask that is the same as that returned by
// getCallPreservedMask but that additionally preserves the register used for
// the first i64 argument (which must also be the register used to return a
//
// In case that the calling convention does not use the same register for
// both, the function should return NULL (does not currently apply)
+ assert(CC != CallingConv::GHC && "should not be GHC calling convention.");
return CSR_AArch64_AAPCS_ThisReturn_RegMask;
}
BitVector
AArch64RegisterInfo::getReservedRegs(const MachineFunction &MF) const {
- const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
+ const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
// FIXME: avoid re-calculating this every time.
BitVector Reserved(getNumRegs());
Reserved.set(AArch64::WSP);
Reserved.set(AArch64::WZR);
- if (TFI->hasFP(MF) || STI->isTargetDarwin()) {
+ if (TFI->hasFP(MF) || TT.isOSDarwin()) {
Reserved.set(AArch64::FP);
Reserved.set(AArch64::W29);
}
- if (STI->isTargetDarwin()) {
+ if (TT.isOSDarwin() || ReserveX18) {
Reserved.set(AArch64::X18); // Platform register
Reserved.set(AArch64::W18);
}
bool AArch64RegisterInfo::isReservedReg(const MachineFunction &MF,
unsigned Reg) const {
- const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
+ const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
switch (Reg) {
default:
return true;
case AArch64::X18:
case AArch64::W18:
- return STI->isTargetDarwin();
+ return TT.isOSDarwin() || ReserveX18;
case AArch64::FP:
case AArch64::W29:
- return TFI->hasFP(MF) || STI->isTargetDarwin();
+ return TFI->hasFP(MF) || TT.isOSDarwin();
case AArch64::W19:
case AArch64::X19:
return hasBasePointer(MF);
// large enough that referencing from the FP won't result in things being
// in range relatively often, we can use a base pointer to allow access
// from the other direction like the SP normally works.
+ // Furthermore, if both variable sized objects are present, and the
+ // stack needs to be dynamically re-aligned, the base pointer is the only
+ // reliable way to reference the locals.
if (MFI->hasVarSizedObjects()) {
+ if (needsStackRealignment(MF))
+ return true;
// Conservatively estimate whether the negative offset from the frame
// pointer will be sufficient to reach. If a function has a smallish
// frame, it's less likely to have lots of spills and callee saved
return false;
}
+bool AArch64RegisterInfo::canRealignStack(const MachineFunction &MF) const {
+
+ if (MF.getFunction()->hasFnAttribute("no-realign-stack"))
+ return false;
+
+ return true;
+}
+
+// FIXME: share this with other backends with identical implementation?
+bool
+AArch64RegisterInfo::needsStackRealignment(const MachineFunction &MF) const {
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ const Function *F = MF.getFunction();
+ unsigned StackAlign = MF.getTarget()
+ .getSubtargetImpl(*MF.getFunction())
+ ->getFrameLowering()
+ ->getStackAlignment();
+ bool requiresRealignment =
+ ((MFI->getMaxAlignment() > StackAlign) ||
+ F->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
+ Attribute::StackAlignment));
+
+ return requiresRealignment && canRealignStack(MF);
+}
+
unsigned
AArch64RegisterInfo::getFrameRegister(const MachineFunction &MF) const {
- const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
+ const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
return TFI->hasFP(MF) ? AArch64::FP : AArch64::SP;
}
// Note that the incoming offset is based on the SP value at function entry,
// so it'll be negative.
MachineFunction &MF = *MI->getParent()->getParent();
- const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
+ const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
MachineFrameInfo *MFI = MF.getFrameInfo();
// Estimate an offset from the frame pointer.
// The FP is only available if there is no dynamic realignment. We
// don't know for sure yet whether we'll need that, so we guess based
// on whether there are any local variables that would trigger it.
- if (TFI->hasFP(MF) && isFrameOffsetLegal(MI, FPOffset))
+ if (TFI->hasFP(MF) && isFrameOffsetLegal(MI, AArch64::FP, FPOffset))
return false;
// If we can reference via the stack pointer or base pointer, try that.
// to only disallow SP relative references in the live range of
// the VLA(s). In practice, it's unclear how much difference that
// would make, but it may be worth doing.
- if (isFrameOffsetLegal(MI, Offset))
+ if (isFrameOffsetLegal(MI, AArch64::SP, Offset))
return false;
// The offset likely isn't legal; we want to allocate a virtual base register.
}
bool AArch64RegisterInfo::isFrameOffsetLegal(const MachineInstr *MI,
+ unsigned BaseReg,
int64_t Offset) const {
assert(Offset <= INT_MAX && "Offset too big to fit in int.");
assert(MI && "Unable to get the legal offset for nil instruction.");
DebugLoc DL; // Defaults to "unknown"
if (Ins != MBB->end())
DL = Ins->getDebugLoc();
-
+ const MachineFunction &MF = *MBB->getParent();
+ const AArch64InstrInfo *TII =
+ MF.getSubtarget<AArch64Subtarget>().getInstrInfo();
const MCInstrDesc &MCID = TII->get(AArch64::ADDXri);
MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
- const MachineFunction &MF = *MBB->getParent();
MRI.constrainRegClass(BaseReg, TII->getRegClass(MCID, 0, this, MF));
unsigned Shifter = AArch64_AM::getShifterImm(AArch64_AM::LSL, 0);
++i;
assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
}
+ const MachineFunction *MF = MI.getParent()->getParent();
+ const AArch64InstrInfo *TII =
+ MF->getSubtarget<AArch64Subtarget>().getInstrInfo();
bool Done = rewriteAArch64FrameIndex(MI, i, BaseReg, Off, TII);
assert(Done && "Unable to resolve frame index!");
(void)Done;
MachineInstr &MI = *II;
MachineBasicBlock &MBB = *MI.getParent();
MachineFunction &MF = *MBB.getParent();
+ const AArch64InstrInfo *TII =
+ MF.getSubtarget<AArch64Subtarget>().getInstrInfo();
const AArch64FrameLowering *TFI = static_cast<const AArch64FrameLowering *>(
- MF.getTarget().getFrameLowering());
+ MF.getSubtarget().getFrameLowering());
int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
unsigned FrameReg;
unsigned AArch64RegisterInfo::getRegPressureLimit(const TargetRegisterClass *RC,
MachineFunction &MF) const {
- const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
+ const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
switch (RC->getID()) {
default:
case AArch64::GPR64RegClassID:
case AArch64::GPR32commonRegClassID:
case AArch64::GPR64commonRegClassID:
- return 32 - 1 // XZR/SP
- - (TFI->hasFP(MF) || STI->isTargetDarwin()) // FP
- - STI->isTargetDarwin() // X18 reserved as platform register
- - hasBasePointer(MF); // X19
+ return 32 - 1 // XZR/SP
+ - (TFI->hasFP(MF) || TT.isOSDarwin()) // FP
+ - (TT.isOSDarwin() || ReserveX18) // X18 reserved as platform register
+ - hasBasePointer(MF); // X19
case AArch64::FPR8RegClassID:
case AArch64::FPR16RegClassID:
case AArch64::FPR32RegClassID:
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