class MachineFunction;
class MachineMove;
class RegScavenger;
+template<class T> class SmallVectorImpl;
/// TargetRegisterDesc - This record contains all of the information known about
/// a particular register. The AliasSet field (if not null) contains a pointer
/// of AX.
///
struct TargetRegisterDesc {
- const char *AsmName; // Assembly language name for the register
const char *Name; // Printable name for the reg (for debugging)
const unsigned *AliasSet; // Register Alias Set, described above
const unsigned *SubRegs; // Sub-register set, described above
typedef const unsigned* iterator;
typedef const unsigned* const_iterator;
- typedef const MVT* vt_iterator;
+ typedef const EVT* vt_iterator;
typedef const TargetRegisterClass* const * sc_iterator;
private:
unsigned ID;
public:
TargetRegisterClass(unsigned id,
const char *name,
- const MVT *vts,
+ const EVT *vts,
const TargetRegisterClass * const *subcs,
const TargetRegisterClass * const *supcs,
const TargetRegisterClass * const *subregcs,
RegSet.insert(*I);
}
virtual ~TargetRegisterClass() {} // Allow subclasses
-
+
/// getID() - Return the register class ID number.
///
unsigned getID() const { return ID; }
}
/// contains - Return true if the specified register is included in this
- /// register class.
+ /// register class. This does not include virtual registers.
bool contains(unsigned Reg) const {
return RegSet.count(Reg);
}
+ /// contains - Return true if both registers are in this class.
+ bool contains(unsigned Reg1, unsigned Reg2) const {
+ return contains(Reg1) && contains(Reg2);
+ }
+
/// hasType - return true if this TargetRegisterClass has the ValueType vt.
///
- bool hasType(MVT vt) const {
- for(int i = 0; VTs[i] != MVT::Other; ++i)
+ bool hasType(EVT vt) const {
+ for(int i = 0; VTs[i].getSimpleVT().SimpleTy != MVT::Other; ++i)
if (VTs[i] == vt)
return true;
return false;
}
-
+
/// vt_begin / vt_end - Loop over all of the value types that can be
/// represented by values in this register class.
vt_iterator vt_begin() const {
vt_iterator vt_end() const {
vt_iterator I = VTs;
- while (*I != MVT::Other) ++I;
+ while (I->getSimpleVT().SimpleTy != MVT::Other) ++I;
return I;
}
/// index SubIdx, or NULL if no such class exists.
const TargetRegisterClass* getSubRegisterRegClass(unsigned SubIdx) const {
assert(SubIdx>0 && "Invalid subregister index");
- for (unsigned s = 0; s != SubIdx-1; ++s)
- if (!SubRegClasses[s])
- return NULL;
return SubRegClasses[SubIdx-1];
}
return I;
}
- /// hasSubClass - return true if the the specified TargetRegisterClass
+ /// hasSubClass - return true if the specified TargetRegisterClass
/// is a proper subset of this TargetRegisterClass.
bool hasSubClass(const TargetRegisterClass *cs) const {
- for (int i = 0; SubClasses[i] != NULL; ++i)
+ for (int i = 0; SubClasses[i] != NULL; ++i)
if (SubClasses[i] == cs)
return true;
return false;
sc_iterator subclasses_begin() const {
return SubClasses;
}
-
+
sc_iterator subclasses_end() const {
sc_iterator I = SubClasses;
while (*I != NULL) ++I;
return I;
}
-
+
/// hasSuperClass - return true if the specified TargetRegisterClass is a
/// proper superset of this TargetRegisterClass.
bool hasSuperClass(const TargetRegisterClass *cs) const {
- for (int i = 0; SuperClasses[i] != NULL; ++i)
+ for (int i = 0; SuperClasses[i] != NULL; ++i)
if (SuperClasses[i] == cs)
return true;
return false;
sc_iterator superclasses_begin() const {
return SuperClasses;
}
-
+
sc_iterator superclasses_end() const {
sc_iterator I = SuperClasses;
while (*I != NULL) ++I;
bool isASubClass() const {
return SuperClasses[0] != 0;
}
-
+
/// allocation_order_begin/end - These methods define a range of registers
/// which specify the registers in this class that are valid to register
/// allocate, and the preferred order to allocate them in. For example,
/// cheaper to allocate caller saved registers.
///
/// These methods take a MachineFunction argument, which can be used to tune
- /// the allocatable registers based on the characteristics of the function.
- /// One simple example is that the frame pointer register can be used if
- /// frame-pointer-elimination is performed.
+ /// the allocatable registers based on the characteristics of the function,
+ /// subtarget, or other criteria.
+ ///
+ /// Register allocators should account for the fact that an allocation
+ /// order iterator may return a reserved register and always check
+ /// if the register is allocatable (getAllocatableSet()) before using it.
///
/// By default, these methods return all registers in the class.
///
protected:
const unsigned* SubregHash;
const unsigned SubregHashSize;
- const unsigned* SuperregHash;
- const unsigned SuperregHashSize;
const unsigned* AliasesHash;
const unsigned AliasesHashSize;
public:
typedef const TargetRegisterClass * const * regclass_iterator;
private:
const TargetRegisterDesc *Desc; // Pointer to the descriptor array
+ const char *const *SubRegIndexNames; // Names of subreg indexes.
unsigned NumRegs; // Number of entries in the array
regclass_iterator RegClassBegin, RegClassEnd; // List of regclasses
int CallFrameSetupOpcode, CallFrameDestroyOpcode;
+
protected:
TargetRegisterInfo(const TargetRegisterDesc *D, unsigned NR,
regclass_iterator RegClassBegin,
regclass_iterator RegClassEnd,
+ const char *const *subregindexnames,
int CallFrameSetupOpcode = -1,
int CallFrameDestroyOpcode = -1,
const unsigned* subregs = 0,
const unsigned subregsize = 0,
- const unsigned* superregs = 0,
- const unsigned superregsize = 0,
const unsigned* aliases = 0,
const unsigned aliasessize = 0);
virtual ~TargetRegisterInfo();
/// FirstVirtualRegister - This is the first register number that is
/// considered to be a 'virtual' register, which is part of the SSA
/// namespace. This must be the same for all targets, which means that each
- /// target is limited to 1024 registers.
- FirstVirtualRegister = 1024
+ /// target is limited to this fixed number of registers.
+ FirstVirtualRegister = 16384
};
/// isPhysicalRegister - Return true if the specified register number is in
return Reg >= FirstVirtualRegister;
}
- /// getPhysicalRegisterRegClass - Returns the Register Class of a physical
- /// register of the given type. If type is MVT::Other, then just return any
- /// register class the register belongs to.
- virtual const TargetRegisterClass *
- getPhysicalRegisterRegClass(unsigned Reg, MVT VT = MVT::Other) const;
+ /// getMinimalPhysRegClass - Returns the Register Class of a physical
+ /// 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;
/// getAllocatableSet - Returns a bitset indexed by register number
/// indicating if a register is allocatable or not. If a register class is
/// specified, returns the subset for the class.
- BitVector getAllocatableSet(MachineFunction &MF,
+ BitVector getAllocatableSet(const MachineFunction &MF,
const TargetRegisterClass *RC = NULL) const;
const TargetRegisterDesc &operator[](unsigned RegNo) const {
return get(RegNo).SuperRegs;
}
- /// getAsmName - Return the symbolic target-specific name for the
- /// specified physical register.
- const char *getAsmName(unsigned RegNo) const {
- return get(RegNo).AsmName;
- }
-
/// getName - Return the human-readable symbolic target-specific name for the
/// specified physical register.
const char *getName(unsigned RegNo) const {
return NumRegs;
}
- /// areAliases - Returns true if the two registers alias each other, false
- /// otherwise
- bool areAliases(unsigned regA, unsigned regB) const {
+ /// getSubRegIndexName - Return the human-readable symbolic target-specific
+ /// name for the specified SubRegIndex.
+ const char *getSubRegIndexName(unsigned SubIdx) const {
+ assert(SubIdx && "This is not a subregister index");
+ return SubRegIndexNames[SubIdx-1];
+ }
+
+ /// 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 {
+ if (regA == regB)
+ return true;
+
+ if (isVirtualRegister(regA) || isVirtualRegister(regB))
+ return false;
+
+ // regA and regB are distinct physical registers. Do they alias?
size_t index = (regA + regB * 37) & (AliasesHashSize-1);
unsigned ProbeAmt = 0;
while (AliasesHash[index*2] != 0 &&
return false;
}
- /// 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 {
- if (regA == regB)
- return true;
-
- if (isVirtualRegister(regA) || isVirtualRegister(regB))
- return false;
- return areAliases(regA, regB);
- }
-
/// isSubRegister - Returns true if regB is a sub-register of regA.
///
bool isSubRegister(unsigned regA, unsigned regB) const {
SubregHash[index*2+1] != 0) {
if (SubregHash[index*2] == regA && SubregHash[index*2+1] == regB)
return true;
-
+
index = (index + ProbeAmt) & (SubregHashSize-1);
ProbeAmt += 2;
}
-
+
return false;
}
/// isSuperRegister - Returns true if regB is a super-register of regA.
///
bool isSuperRegister(unsigned regA, unsigned regB) const {
- // SuperregHash is a simple quadratically probed hash table.
- size_t index = (regA + regB * 37) & (SuperregHashSize-1);
- unsigned ProbeAmt = 2;
- while (SuperregHash[index*2] != 0 &&
- SuperregHash[index*2+1] != 0) {
- if (SuperregHash[index*2] == regA && SuperregHash[index*2+1] == regB)
- return true;
-
- index = (index + ProbeAmt) & (SuperregHashSize-1);
- ProbeAmt += 2;
- }
-
- return false;
+ return isSubRegister(regB, regA);
}
/// getCalleeSavedRegs - Return a null-terminated list of all of the
virtual const unsigned* getCalleeSavedRegs(const MachineFunction *MF = 0)
const = 0;
- /// getCalleeSavedRegClasses - Return a null-terminated list of the preferred
- /// register classes to spill each callee saved register with. The order and
- /// length of this list match the getCalleeSaveRegs() list.
- virtual const TargetRegisterClass* const *getCalleeSavedRegClasses(
- const MachineFunction *MF) const =0;
/// getReservedRegs - Returns a bitset indexed by physical register number
/// indicating if a register is a special register that has particular uses
/// exist.
virtual unsigned getSubReg(unsigned RegNo, unsigned Index) const = 0;
+ /// getSubRegIndex - For a given register pair, return the sub-register index
+ /// if the second register is a sub-register of the first. Return zero
+ /// otherwise.
+ virtual unsigned getSubRegIndex(unsigned RegNo, unsigned SubRegNo) const = 0;
+
/// 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,
+ unsigned getMatchingSuperReg(unsigned Reg, unsigned SubIdx,
const TargetRegisterClass *RC) const {
for (const unsigned *SRs = getSuperRegisters(Reg); unsigned SR = *SRs;++SRs)
if (Reg == getSubReg(SR, SubIdx) && RC->contains(SR))
return 0;
}
+ /// canCombineSubRegIndices - Given a register class and a list of
+ /// subregister indices, return true if it's possible to combine the
+ /// subregister indices into one that corresponds to a larger
+ /// subregister. Return the new subregister index by reference. Note the
+ /// new index may be zero if the given subregisters can be combined to
+ /// form the whole register.
+ virtual bool canCombineSubRegIndices(const TargetRegisterClass *RC,
+ SmallVectorImpl<unsigned> &SubIndices,
+ unsigned &NewSubIdx) const {
+ return 0;
+ }
+
+ /// getMatchingSuperRegClass - Return a subclass of the specified register
+ /// class A so that each register in it has a sub-register of the
+ /// specified sub-register index which is in the specified register class B.
+ virtual const TargetRegisterClass *
+ getMatchingSuperRegClass(const TargetRegisterClass *A,
+ const TargetRegisterClass *B, unsigned Idx) const {
+ return 0;
+ }
+
+ /// composeSubRegIndices - Return the subregister index you get from composing
+ /// two subregister indices.
+ ///
+ /// If R:a:b is the same register as R:c, then composeSubRegIndices(a, b)
+ /// returns c. Note that composeSubRegIndices does not tell you about illegal
+ /// compositions. If R does not have a subreg a, or R:a does not have a subreg
+ /// b, composeSubRegIndices doesn't tell you.
+ ///
+ /// The ARM register Q0 has two D subregs dsub_0:D0 and dsub_1:D1. It also has
+ /// ssub_0:S0 - ssub_3:S3 subregs.
+ /// If you compose subreg indices dsub_1, ssub_0 you get ssub_2.
+ ///
+ virtual unsigned composeSubRegIndices(unsigned a, unsigned b) const {
+ // This default implementation is correct for most targets.
+ return b;
+ }
+
//===--------------------------------------------------------------------===//
// Register Class Information
//
unsigned getNumRegClasses() const {
return (unsigned)(regclass_end()-regclass_begin());
}
-
+
/// getRegClass - Returns the register class associated with the enumeration
/// value. See class TargetOperandInfo.
const TargetRegisterClass *getRegClass(unsigned i) const {
- assert(i <= getNumRegClasses() && "Register Class ID out of range");
- return i ? RegClassBegin[i - 1] : NULL;
+ assert(i < getNumRegClasses() && "Register Class ID out of range");
+ return RegClassBegin[i];
}
/// getPointerRegClass - Returns a TargetRegisterClass used for pointer
- /// values.
- virtual const TargetRegisterClass *getPointerRegClass() const {
+ /// values. If a target supports multiple different pointer register classes,
+ /// kind specifies which one is indicated.
+ virtual const TargetRegisterClass *getPointerRegClass(unsigned Kind=0) const {
assert(0 && "Target didn't implement getPointerRegClass!");
return 0; // Must return a value in order to compile with VS 2005
}
virtual bool requiresRegisterScavenging(const MachineFunction &MF) const {
return false;
}
-
+
+ /// requiresFrameIndexScavenging - returns true if the target requires post
+ /// PEI scavenging of registers for materializing frame index constants.
+ virtual bool requiresFrameIndexScavenging(const MachineFunction &MF) const {
+ return false;
+ }
+
+ /// requiresVirtualBaseRegisters - Returns true if the target wants the
+ /// LocalStackAllocation pass to be run and virtual base registers
+ /// used for more efficient stack access.
+ virtual bool requiresVirtualBaseRegisters(const MachineFunction &MF) const {
+ return false;
+ }
+
/// hasFP - Return true if the specified function should have a dedicated
/// frame pointer register. For most targets this is true only if the function
/// has variable sized allocas or if frame pointer elimination is disabled.
virtual bool hasFP(const MachineFunction &MF) const = 0;
- // hasReservedCallFrame - Under normal circumstances, when a frame pointer is
- // not required, we reserve argument space for call sites in the function
- // immediately on entry to the current function. This eliminates the need for
- // add/sub sp brackets around call sites. Returns true if the call frame is
- // included as part of the stack frame.
- virtual bool hasReservedCallFrame(MachineFunction &MF) const {
+ /// hasReservedCallFrame - Under normal circumstances, when a frame pointer is
+ /// not required, we reserve argument space for call sites in the function
+ /// immediately on entry to the current function. This eliminates the need for
+ /// add/sub sp brackets around call sites. Returns true if the call frame is
+ /// included as part of the stack frame.
+ virtual bool hasReservedCallFrame(const MachineFunction &MF) const {
return !hasFP(MF);
}
- // needsStackRealignment - true if storage within the function requires the
- // stack pointer to be aligned more than the normal calling convention calls
- // for.
+ /// canSimplifyCallFramePseudos - When possible, it's best to simplify the
+ /// call frame pseudo ops before doing frame index elimination. This is
+ /// possible only when frame index references between the pseudos won't
+ /// need adjusting for the call frame adjustments. Normally, that's true
+ /// if the function has a reserved call frame or a frame pointer. Some
+ /// targets (Thumb2, for example) may have more complicated criteria,
+ /// however, and can override this behavior.
+ virtual bool canSimplifyCallFramePseudos(const MachineFunction &MF) const {
+ return hasReservedCallFrame(MF) || hasFP(MF);
+ }
+
+ /// hasReservedSpillSlot - Return true if target has reserved a spill slot in
+ /// the stack frame of the given function for the specified register. e.g. On
+ /// x86, if the frame register is required, the first fixed stack object is
+ /// reserved as its spill slot. This tells PEI not to create a new stack frame
+ /// object for the given register. It should be called only after
+ /// processFunctionBeforeCalleeSavedScan().
+ virtual bool hasReservedSpillSlot(const MachineFunction &MF, unsigned Reg,
+ int &FrameIdx) const {
+ return false;
+ }
+
+ /// needsStackRealignment - true if storage within the function requires the
+ /// stack pointer to be aligned more than the normal calling convention calls
+ /// for.
virtual bool needsStackRealignment(const MachineFunction &MF) const {
return false;
}
+ /// getFrameIndexInstrOffset - Get the offset from the referenced frame
+ /// index in the instruction, if the is one.
+ virtual int64_t getFrameIndexInstrOffset(const MachineInstr *MI,
+ int Idx) const {
+ return 0;
+ }
+
+ /// needsFrameBaseReg - Returns true if the instruction's frame index
+ /// reference would be better served by a base register other than FP
+ /// or SP. Used by LocalStackFrameAllocation to determine which frame index
+ /// references it should create new base registers for.
+ virtual bool needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const {
+ return false;
+ }
+
+ /// materializeFrameBaseRegister - Insert defining instruction(s) for
+ /// BaseReg to be a pointer to FrameIdx before insertion point I.
+ virtual void materializeFrameBaseRegister(MachineBasicBlock::iterator I,
+ unsigned BaseReg, int FrameIdx,
+ int64_t Offset) const {
+ assert(0 && "materializeFrameBaseRegister does not exist on this target");
+ }
+
+ /// 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 {
+ assert(0 && "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,
+ int64_t Offset) const {
+ assert(0 && "isFrameOffsetLegal does not exist on this target");
+ return false; // Must return a value in order to compile with VS 2005
+ }
+
/// getCallFrameSetup/DestroyOpcode - These methods return the opcode of the
/// frame setup/destroy instructions if they exist (-1 otherwise). Some
/// targets use pseudo instructions in order to abstract away the difference
}
/// processFunctionBeforeFrameFinalized - This method is called immediately
- /// before the specified functions frame layout (MF.getFrameInfo()) is
+ /// before the specified function's frame layout (MF.getFrameInfo()) is
/// finalized. Once the frame is finalized, MO_FrameIndex operands are
/// replaced with direct constants. This method is optional.
///
virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
}
+ /// saveScavengerRegister - Spill the register so it can be used by the
+ /// register scavenger. Return true if the register was spilled, false
+ /// otherwise. If this function does not spill the register, the scavenger
+ /// will instead spill it to the emergency spill slot.
+ ///
+ virtual bool saveScavengerRegister(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I,
+ MachineBasicBlock::iterator &UseMI,
+ const TargetRegisterClass *RC,
+ unsigned Reg) const {
+ return false;
+ }
+
/// eliminateFrameIndex - This method must be overriden to eliminate abstract
/// frame indices from instructions which may use them. The instruction
/// 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 the 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.
virtual void eliminateFrameIndex(MachineBasicBlock::iterator MI,
virtual void emitPrologue(MachineFunction &MF) const = 0;
virtual void emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const = 0;
-
+
//===--------------------------------------------------------------------===//
/// Debug information queries.
-
+
/// getDwarfRegNum - Map a target register to an equivalent dwarf register
/// number. Returns -1 if there is no equivalent value. The second
/// parameter allows targets to use different numberings for EH info and
/// getFrameRegister - This method should return the register used as a base
/// for values allocated in the current stack frame.
- virtual unsigned getFrameRegister(MachineFunction &MF) const = 0;
+ virtual unsigned getFrameRegister(const MachineFunction &MF) const = 0;
/// getFrameIndexOffset - Returns the displacement from the frame register to
/// the stack frame of the specified index.
- virtual int getFrameIndexOffset(MachineFunction &MF, int FI) const;
-
+ virtual int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
+
+ /// getFrameIndexReference - This method should return the base register
+ /// and offset used to reference a frame index location. The offset is
+ /// returned directly, and the base register is returned via FrameReg.
+ virtual int getFrameIndexReference(const MachineFunction &MF, int FI,
+ unsigned &FrameReg) const {
+ // By default, assume all frame indices are referenced via whatever
+ // getFrameRegister() says. The target can override this if it's doing
+ // something different.
+ FrameReg = getFrameRegister(MF);
+ return getFrameIndexOffset(MF, FI);
+ }
+
/// getRARegister - This method should return the register where the return
/// address can be found.
virtual unsigned getRARegister() const = 0;
-
+
/// getInitialFrameState - Returns a list of machine moves that are assumed
/// on entry to all functions. Note that LabelID is ignored (assumed to be
/// the beginning of the function.)
// This is useful when building IndexedMaps keyed on virtual registers
-struct VirtReg2IndexFunctor : std::unary_function<unsigned, unsigned> {
+struct VirtReg2IndexFunctor : public std::unary_function<unsigned, unsigned> {
unsigned operator()(unsigned Reg) const {
return Reg - TargetRegisterInfo::FirstVirtualRegister;
}
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