#define LLVM_TARGET_TARGETREGISTERINFO_H
#include "llvm/ADT/ArrayRef.h"
-#include "llvm/CallingConv.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
-#include "llvm/CodeGen/ValueTypes.h"
+#include "llvm/CodeGen/MachineValueType.h"
+#include "llvm/IR/CallingConv.h"
#include "llvm/MC/MCRegisterInfo.h"
#include <cassert>
#include <functional>
const vt_iterator VTs;
const uint32_t *SubClassMask;
const uint16_t *SuperRegIndices;
+ const unsigned LaneMask;
+ /// Classes with a higher priority value are assigned first by register
+ /// allocators using a greedy heuristic. The value is in the range [0,63].
+ const uint8_t AllocationPriority;
+ /// Whether the class supports two (or more) disjunct subregister indices.
+ const bool HasDisjunctSubRegs;
const sc_iterator SuperClasses;
ArrayRef<MCPhysReg> (*OrderFunc)(const MachineFunction&);
///
unsigned getID() const { return MC->getID(); }
- /// getName() - Return the register class name for debugging.
- ///
- const char *getName() const { return MC->getName(); }
-
/// begin/end - Return all of the registers in this class.
///
iterator begin() const { return MC->begin(); }
/// hasType - return true if this TargetRegisterClass has the ValueType vt.
///
- bool hasType(EVT vt) const {
+ bool hasType(MVT vt) const {
for(int i = 0; VTs[i] != MVT::Other; ++i)
- if (EVT(VTs[i]) == vt)
+ if (MVT(VTs[i]) == vt)
return true;
return false;
}
/// isASubClass - return true if this TargetRegisterClass is a subset
/// class of at least one other TargetRegisterClass.
bool isASubClass() const {
- return SuperClasses[0] != 0;
+ return SuperClasses[0] != nullptr;
}
/// getRawAllocationOrder - Returns the preferred order for allocating
ArrayRef<MCPhysReg> getRawAllocationOrder(const MachineFunction &MF) const {
return OrderFunc ? OrderFunc(MF) : makeArrayRef(begin(), getNumRegs());
}
+
+ /// Returns the combination of all lane masks of register in this class.
+ /// The lane masks of the registers are the combination of all lane masks
+ /// of their subregisters.
+ unsigned getLaneMask() const {
+ return LaneMask;
+ }
};
/// TargetRegisterInfoDesc - Extra information, not in MCRegisterDesc, about
const unsigned *SubRegIndexLaneMasks;
regclass_iterator RegClassBegin, RegClassEnd; // List of regclasses
+ unsigned CoveringLanes;
protected:
TargetRegisterInfo(const TargetRegisterInfoDesc *ID,
regclass_iterator RegClassBegin,
regclass_iterator RegClassEnd,
const char *const *SRINames,
- const unsigned *SRILaneMasks);
+ const unsigned *SRILaneMasks,
+ unsigned CoveringLanes);
virtual ~TargetRegisterInfo();
public:
/// register of the given type, picking the most sub register class of
/// the right type that contains this physreg.
const TargetRegisterClass *
- getMinimalPhysRegClass(unsigned Reg, EVT VT = MVT::Other) const;
+ getMinimalPhysRegClass(unsigned Reg, MVT VT = MVT::Other) const;
/// getAllocatableClass - Return the maximal subclass of the given register
/// class that is alloctable, or NULL.
/// indicating if a register is allocatable or not. If a register class is
/// specified, returns the subset for the class.
BitVector getAllocatableSet(const MachineFunction &MF,
- const TargetRegisterClass *RC = NULL) const;
+ const TargetRegisterClass *RC = nullptr) const;
/// getCostPerUse - Return the additional cost of using this register instead
/// of other registers in its class.
///
/// then:
///
- /// getSubRegIndexLaneMask(A) & getSubRegIndexLaneMask(B) != 0
+ /// (getSubRegIndexLaneMask(A) & getSubRegIndexLaneMask(B)) != 0
///
/// The converse is not necessarily true. If two lane masks have a common
/// bit, the corresponding sub-registers may not overlap, but it can be
/// assumed that they usually will.
+ /// SubIdx == 0 is allowed, it has the lane mask ~0u.
unsigned getSubRegIndexLaneMask(unsigned SubIdx) const {
- // SubIdx == 0 is allowed, it has the lane mask ~0u.
assert(SubIdx < getNumSubRegIndices() && "This is not a subregister index");
return SubRegIndexLaneMasks[SubIdx];
}
+ /// The lane masks returned by getSubRegIndexLaneMask() above can only be
+ /// used to determine if sub-registers overlap - they can't be used to
+ /// determine if a set of sub-registers completely cover another
+ /// sub-register.
+ ///
+ /// The X86 general purpose registers have two lanes corresponding to the
+ /// sub_8bit and sub_8bit_hi sub-registers. Both sub_32bit and sub_16bit have
+ /// lane masks '3', but the sub_16bit sub-register doesn't fully cover the
+ /// sub_32bit sub-register.
+ ///
+ /// On the other hand, the ARM NEON lanes fully cover their registers: The
+ /// dsub_0 sub-register is completely covered by the ssub_0 and ssub_1 lanes.
+ /// This is related to the CoveredBySubRegs property on register definitions.
+ ///
+ /// This function returns a bit mask of lanes that completely cover their
+ /// sub-registers. More precisely, given:
+ ///
+ /// Covering = getCoveringLanes();
+ /// MaskA = getSubRegIndexLaneMask(SubA);
+ /// MaskB = getSubRegIndexLaneMask(SubB);
+ ///
+ /// If (MaskA & ~(MaskB & Covering)) == 0, then SubA is completely covered by
+ /// SubB.
+ unsigned getCoveringLanes() const { return CoveringLanes; }
+
/// regsOverlap - Returns true if the two registers are equal or alias each
/// other. The registers may be virtual register.
bool regsOverlap(unsigned regA, unsigned regB) const {
return false;
}
- /// isSubRegister - Returns true if regB is a sub-register of regA.
- ///
- bool isSubRegister(unsigned regA, unsigned regB) const {
- return isSuperRegister(regB, regA);
- }
-
- /// isSuperRegister - Returns true if regB is a super-register of regA.
- ///
- bool isSuperRegister(unsigned RegA, unsigned RegB) const {
- for (MCSuperRegIterator I(RegA, this); I.isValid(); ++I)
- if (*I == RegB)
- return true;
- return false;
- }
-
/// getCalleeSavedRegs - Return a null-terminated list of all of the
/// callee saved registers on this target. The register should be in the
/// order of desired callee-save stack frame offset. The first register is
/// closest to the incoming stack pointer if stack grows down, and vice versa.
///
- virtual const MCPhysReg* getCalleeSavedRegs(const MachineFunction *MF = 0)
- const = 0;
+ virtual const MCPhysReg*
+ getCalleeSavedRegs(const MachineFunction *MF) const = 0;
/// getCallPreservedMask - Return a mask of call-preserved registers for the
- /// given calling convention on the current sub-target. The mask should
+ /// given calling convention on the current function. The mask should
/// include all call-preserved aliases. This is used by the register
/// allocator to determine which registers can be live across a call.
///
/// instructions should use implicit-def operands to indicate call clobbered
/// registers.
///
- virtual const uint32_t *getCallPreservedMask(CallingConv::ID) const {
+ virtual const uint32_t *getCallPreservedMask(const MachineFunction &MF,
+ CallingConv::ID) const {
// The default mask clobbers everything. All targets should override.
- return 0;
+ return nullptr;
}
/// getReservedRegs - Returns a bitset indexed by physical register number
/// used by register scavenger to determine what registers are free.
virtual BitVector getReservedRegs(const MachineFunction &MF) const = 0;
+ /// Prior to adding the live-out mask to a stackmap or patchpoint
+ /// instruction, provide the target the opportunity to adjust it (mainly to
+ /// remove pseudo-registers that should be ignored).
+ virtual void adjustStackMapLiveOutMask(uint32_t *Mask) const { }
+
/// getMatchingSuperReg - Return a super-register of the specified register
/// Reg so its sub-register of index SubIdx is Reg.
unsigned getMatchingSuperReg(unsigned Reg, unsigned SubIdx,
return composeSubRegIndicesImpl(a, b);
}
+ /// Transforms a LaneMask computed for one subregister to the lanemask that
+ /// would have been computed when composing the subsubregisters with IdxA
+ /// first. @sa composeSubRegIndices()
+ unsigned composeSubRegIndexLaneMask(unsigned IdxA, unsigned LaneMask) const {
+ if (!IdxA)
+ return LaneMask;
+ return composeSubRegIndexLaneMaskImpl(IdxA, LaneMask);
+ }
+
+ /// Debugging helper: dump register in human readable form to dbgs() stream.
+ static void dumpReg(unsigned Reg, unsigned SubRegIndex = 0,
+ const TargetRegisterInfo* TRI = nullptr);
+
protected:
/// Overridden by TableGen in targets that have sub-registers.
virtual unsigned composeSubRegIndicesImpl(unsigned, unsigned) const {
llvm_unreachable("Target has no sub-registers");
}
+ /// Overridden by TableGen in targets that have sub-registers.
+ virtual unsigned
+ composeSubRegIndexLaneMaskImpl(unsigned, unsigned) const {
+ llvm_unreachable("Target has no sub-registers");
+ }
+
public:
/// getCommonSuperRegClass - Find a common super-register class if it exists.
///
return RegClassBegin[i];
}
+ /// getRegClassName - Returns the name of the register class.
+ const char *getRegClassName(const TargetRegisterClass *Class) const {
+ return MCRegisterInfo::getRegClassName(Class->MC);
+ }
+
/// getCommonSubClass - find the largest common subclass of A and B. Return
/// NULL if there is no common subclass.
const TargetRegisterClass *
/// legal to use in the current sub-target and has the same spill size.
/// The returned register class can be used to create virtual registers which
/// means that all its registers can be copied and spilled.
- virtual const TargetRegisterClass*
- getLargestLegalSuperClass(const TargetRegisterClass *RC) const {
+ virtual const TargetRegisterClass *
+ getLargestLegalSuperClass(const TargetRegisterClass *RC,
+ const MachineFunction &) const {
/// The default implementation is very conservative and doesn't allow the
/// register allocator to inflate register classes.
return RC;
/// Get the register unit pressure limit for this dimension.
/// This limit must be adjusted dynamically for reserved registers.
- virtual unsigned getRegPressureSetLimit(unsigned Idx) const = 0;
+ virtual unsigned getRegPressureSetLimit(const MachineFunction &MF,
+ unsigned Idx) const = 0;
/// Get the dimensions of register pressure impacted by this register class.
/// Returns a -1 terminated array of pressure set IDs.
ArrayRef<MCPhysReg> Order,
SmallVectorImpl<MCPhysReg> &Hints,
const MachineFunction &MF,
- const VirtRegMap *VRM = 0) const;
-
- /// avoidWriteAfterWrite - Return true if the register allocator should avoid
- /// writing a register from RC in two consecutive instructions.
- /// This can avoid pipeline stalls on certain architectures.
- /// It does cause increased register pressure, though.
- virtual bool avoidWriteAfterWrite(const TargetRegisterClass *RC) const {
- return false;
- }
+ const VirtRegMap *VRM = nullptr) const;
- /// UpdateRegAllocHint - A callback to allow target a chance to update
+ /// updateRegAllocHint - A callback to allow target a chance to update
/// register allocation hints when a register is "changed" (e.g. coalesced)
/// to another register. e.g. On ARM, some virtual registers should target
/// register pairs, if one of pair is coalesced to another register, the
/// allocation hint of the other half of the pair should be changed to point
/// to the new register.
- virtual void UpdateRegAllocHint(unsigned Reg, unsigned NewReg,
+ virtual void updateRegAllocHint(unsigned Reg, unsigned NewReg,
MachineFunction &MF) const {
// Do nothing.
}
+ /// Allow the target to reverse allocation order of local live ranges. This
+ /// will generally allocate shorter local live ranges first. For targets with
+ /// many registers, this could reduce regalloc compile time by a large
+ /// factor. It is disabled by default for three reasons:
+ /// (1) Top-down allocation is simpler and easier to debug for targets that
+ /// don't benefit from reversing the order.
+ /// (2) Bottom-up allocation could result in poor evicition decisions on some
+ /// targets affecting the performance of compiled code.
+ /// (3) Bottom-up allocation is no longer guaranteed to optimally color.
+ virtual bool reverseLocalAssignment() const { return false; }
+
+ /// Allow the target to override the cost of using a callee-saved register for
+ /// the first time. Default value of 0 means we will use a callee-saved
+ /// register if it is available.
+ virtual unsigned getCSRFirstUseCost() const { return 0; }
+
/// requiresRegisterScavenging - returns true if the target requires (and can
/// make use of) the register scavenger.
virtual bool requiresRegisterScavenging(const MachineFunction &MF) const {
/// resolveFrameIndex - Resolve a frame index operand of an instruction
/// to reference the indicated base register plus offset instead.
- virtual void resolveFrameIndex(MachineBasicBlock::iterator I,
- unsigned BaseReg, int64_t Offset) const {
+ virtual void resolveFrameIndex(MachineInstr &MI, unsigned BaseReg,
+ int64_t Offset) const {
llvm_unreachable("resolveFrameIndex does not exist on this target");
}
- /// isFrameOffsetLegal - Determine whether a given offset immediate is
- /// encodable to resolve a frame index.
- virtual bool isFrameOffsetLegal(const MachineInstr *MI,
+ /// isFrameOffsetLegal - Determine whether a given base register plus offset
+ /// immediate is encodable to resolve a frame index.
+ virtual bool isFrameOffsetLegal(const MachineInstr *MI, unsigned BaseReg,
int64_t Offset) const {
llvm_unreachable("isFrameOffsetLegal does not exist on this target");
}
- /// eliminateCallFramePseudoInstr - This method is called during prolog/epilog
- /// code insertion to eliminate call frame setup and destroy pseudo
- /// instructions (but only if the Target is using them). It is responsible
- /// for eliminating these instructions, replacing them with concrete
- /// instructions. This method need only be implemented if using call frame
- /// setup/destroy pseudo instructions.
- ///
- virtual void
- eliminateCallFramePseudoInstr(MachineFunction &MF,
- MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MI) const {
- llvm_unreachable("Call Frame Pseudo Instructions do not exist on this "
- "target!");
- }
-
/// saveScavengerRegister - Spill the register so it can be used by the
/// register scavenger. Return true if the register was spilled, false
/// referenced by the iterator contains an MO_FrameIndex operand which must be
/// eliminated by this method. This method may modify or replace the
/// specified instruction, as long as it keeps the iterator pointing at the
- /// finished product. SPAdj is the SP adjustment due to call frame setup
- /// instruction.
+ /// finished product. SPAdj is the SP adjustment due to call frame setup
+ /// instruction. FIOperandNum is the FI operand number.
virtual void eliminateFrameIndex(MachineBasicBlock::iterator MI,
- int SPAdj, RegScavenger *RS=NULL) const = 0;
+ int SPAdj, unsigned FIOperandNum,
+ RegScavenger *RS = nullptr) const = 0;
+
+ //===--------------------------------------------------------------------===//
+ /// Subtarget Hooks
+
+ /// \brief SrcRC and DstRC will be morphed into NewRC if this returns true.
+ virtual bool shouldCoalesce(MachineInstr *MI,
+ const TargetRegisterClass *SrcRC,
+ unsigned SubReg,
+ const TargetRegisterClass *DstRC,
+ unsigned DstSubReg,
+ const TargetRegisterClass *NewRC) const
+ { return true; }
//===--------------------------------------------------------------------===//
/// Debug information queries.
/// getFrameRegister - This method should return the register used as a base
/// for values allocated in the current stack frame.
virtual unsigned getFrameRegister(const MachineFunction &MF) const = 0;
-
- /// getCompactUnwindRegNum - This function maps the register to the number for
- /// compact unwind encoding. Return -1 if the register isn't valid.
- virtual int getCompactUnwindRegNum(unsigned, bool) const {
- return -1;
- }
};
Mask += RCMaskWords;
SubReg = *Idx++;
if (!SubReg)
- Idx = 0;
+ Idx = nullptr;
}
};
unsigned Reg;
unsigned SubIdx;
public:
- explicit PrintReg(unsigned reg, const TargetRegisterInfo *tri = 0,
+ explicit PrintReg(unsigned reg, const TargetRegisterInfo *tri = nullptr,
unsigned subidx = 0)
: TRI(tri), Reg(reg), SubIdx(subidx) {}
void print(raw_ostream&) const;
/// Usage: OS << PrintRegUnit(Unit, TRI) << '\n';
///
class PrintRegUnit {
+protected:
const TargetRegisterInfo *TRI;
unsigned Unit;
public:
return OS;
}
+/// PrintVRegOrUnit - It is often convenient to track virtual registers and
+/// physical register units in the same list.
+class PrintVRegOrUnit : protected PrintRegUnit {
+public:
+ PrintVRegOrUnit(unsigned VRegOrUnit, const TargetRegisterInfo *tri)
+ : PrintRegUnit(VRegOrUnit, tri) {}
+ void print(raw_ostream&) const;
+};
+
+static inline raw_ostream &operator<<(raw_ostream &OS,
+ const PrintVRegOrUnit &PR) {
+ PR.print(OS);
+ return OS;
+}
+
} // End llvm namespace
#endif
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