llvm-6502/lib/Target/SparcV9/SparcV9RegInfo.h

380 lines
14 KiB
C
Raw Normal View History

//===-- SparcV9RegInfo.h - SparcV9 Target Register Info ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is used to describe the register file of the SparcV9 target to
// its register allocator.
//
//===----------------------------------------------------------------------===//
#ifndef SPARCV9REGINFO_H
#define SPARCV9REGINFO_H
#include "llvm/ADT/hash_map"
#include <string>
#include <cassert>
namespace llvm {
class TargetMachine;
class IGNode;
class Type;
class Value;
class LiveRangeInfo;
class Function;
class LiveRange;
class AddedInstrns;
class MachineInstr;
class BasicBlock;
class SparcV9TargetMachine;
///----------------------------------------------------------------------------
/// Interface to description of machine register class (e.g., int reg class
/// float reg class etc)
///
class TargetRegClassInfo {
protected:
const unsigned RegClassID; // integer ID of a reg class
const unsigned NumOfAvailRegs; // # of avail for coloring -without SP etc.
const unsigned NumOfAllRegs; // # of all registers -including SP,g0 etc.
public:
inline unsigned getRegClassID() const { return RegClassID; }
inline unsigned getNumOfAvailRegs() const { return NumOfAvailRegs; }
inline unsigned getNumOfAllRegs() const { return NumOfAllRegs; }
// This method marks the registers used for a given register number.
// This defaults to marking a single register but may mark multiple
// registers when a single number denotes paired registers.
//
virtual void markColorsUsed(unsigned RegInClass,
int UserRegType,
int RegTypeWanted,
std::vector<bool> &IsColorUsedArr) const {
assert(RegInClass < NumOfAllRegs && RegInClass < IsColorUsedArr.size());
assert(UserRegType == RegTypeWanted &&
"Default method is probably incorrect for class with multiple types.");
IsColorUsedArr[RegInClass] = true;
}
// This method finds unused registers of the specified register type,
// using the given "used" flag array IsColorUsedArr. It defaults to
// checking a single entry in the array directly, but that can be overridden
// for paired registers and other such silliness.
// It returns -1 if no unused color is found.
//
virtual int findUnusedColor(int RegTypeWanted,
const std::vector<bool> &IsColorUsedArr) const {
// find first unused color in the IsColorUsedArr directly
unsigned NC = this->getNumOfAvailRegs();
assert(IsColorUsedArr.size() >= NC && "Invalid colors-used array");
for (unsigned c = 0; c < NC; c++)
if (!IsColorUsedArr[c])
return c;
return -1;
}
// This method should find a color which is not used by neighbors
// (i.e., a false position in IsColorUsedArr) and
virtual void colorIGNode(IGNode *Node,
const std::vector<bool> &IsColorUsedArr) const = 0;
// Check whether a specific register is volatile, i.e., whether it is not
// preserved across calls
virtual bool isRegVolatile(int Reg) const = 0;
// Check whether a specific register is modified as a side-effect of the
// call instruction itself,
virtual bool modifiedByCall(int Reg) const { return false; }
virtual const char* const getRegName(unsigned reg) const = 0;
TargetRegClassInfo(unsigned ID, unsigned NVR, unsigned NAR)
: RegClassID(ID), NumOfAvailRegs(NVR), NumOfAllRegs(NAR) {}
};
/// SparcV9RegInfo - Interface to register info of SparcV9 target machine
///
class SparcV9RegInfo {
SparcV9RegInfo(const SparcV9RegInfo &); // DO NOT IMPLEMENT
void operator=(const SparcV9RegInfo &); // DO NOT IMPLEMENT
protected:
// A vector of all machine register classes
//
std::vector<const TargetRegClassInfo *> MachineRegClassArr;
public:
const TargetMachine &target;
// A register can be initialized to an invalid number. That number can
// be obtained using this method.
//
static int getInvalidRegNum() { return -1; }
// According the definition of a MachineOperand class, a Value in a
// machine instruction can go into either a normal register or a
// condition code register. If isCCReg is true below, the ID of the condition
// code register class will be returned. Otherwise, the normal register
// class (eg. int, float) must be returned.
// To find the register class used for a specified Type
//
unsigned getRegClassIDOfType (const Type *type,
bool isCCReg = false) const;
// To find the register class to which a specified register belongs
//
unsigned getRegClassIDOfRegType(int regType) const;
unsigned getRegClassIDOfReg(int unifiedRegNum) const {
unsigned classId = 0;
(void) getClassRegNum(unifiedRegNum, classId);
return classId;
}
unsigned int getNumOfRegClasses() const {
return MachineRegClassArr.size();
}
const TargetRegClassInfo *getMachineRegClass(unsigned i) const {
return MachineRegClassArr[i];
}
// getZeroRegNum - returns the register that is hardwired to always contain
// zero, if any (-1 if none). This is the unified register number.
//
unsigned getZeroRegNum() const;
// The following methods are used to color special live ranges (e.g.
// method args and return values etc.) with specific hardware registers
// as required. See SparcRegInfo.cpp for the implementation for Sparc.
//
void suggestRegs4MethodArgs(const Function *Func,
LiveRangeInfo& LRI) const;
void suggestRegs4CallArgs(MachineInstr *CallI,
LiveRangeInfo& LRI) const;
void suggestReg4RetValue(MachineInstr *RetI,
LiveRangeInfo& LRI) const;
void colorMethodArgs(const Function *Func,
LiveRangeInfo &LRI,
std::vector<MachineInstr*>& InstrnsBefore,
std::vector<MachineInstr*>& InstrnsAfter) const;
// Check whether a specific register is volatile, i.e., whether it is not
// preserved across calls
inline bool isRegVolatile(int RegClassID, int Reg) const {
return MachineRegClassArr[RegClassID]->isRegVolatile(Reg);
}
// Check whether a specific register is modified as a side-effect of the
// call instruction itself,
inline bool modifiedByCall(int RegClassID, int Reg) const {
return MachineRegClassArr[RegClassID]->modifiedByCall(Reg);
}
// getCallAddressReg - Returns the reg used for pushing the address
// when a method is called. This can be used for other purposes
// between calls
//
unsigned getCallAddressReg() const;
// Each register class has a separate space for register IDs. To convert
// a regId in a register class to a common Id, or vice versa,
// we use the folloing two methods.
//
// This method converts from class reg. number to unified register number.
int getUnifiedRegNum(unsigned regClassID, int reg) const {
if (reg == getInvalidRegNum()) { return getInvalidRegNum(); }
assert(regClassID < getNumOfRegClasses() && "Invalid register class");
int totalRegs = 0;
for (unsigned rcid = 0; rcid < regClassID; ++rcid)
totalRegs += MachineRegClassArr[rcid]->getNumOfAllRegs();
return reg + totalRegs;
}
// This method converts the unified number to the number in its class,
// and returns the class ID in regClassID.
int getClassRegNum(int uRegNum, unsigned& regClassID) const {
if (uRegNum == getInvalidRegNum()) { return getInvalidRegNum(); }
int totalRegs = 0, rcid = 0, NC = getNumOfRegClasses();
while (rcid < NC &&
uRegNum>= totalRegs+(int)MachineRegClassArr[rcid]->getNumOfAllRegs())
{
totalRegs += MachineRegClassArr[rcid]->getNumOfAllRegs();
rcid++;
}
if (rcid == NC) {
assert(0 && "getClassRegNum(): Invalid register number");
return getInvalidRegNum();
}
regClassID = rcid;
return uRegNum - totalRegs;
}
// Returns the assembly-language name of the specified machine register.
//
const char * const getUnifiedRegName(int UnifiedRegNum) const {
unsigned regClassID = getNumOfRegClasses(); // initialize to invalid value
int regNumInClass = getClassRegNum(UnifiedRegNum, regClassID);
return MachineRegClassArr[regClassID]->getRegName(regNumInClass);
}
// This method gives the the number of bytes of stack space allocated
// to a register when it is spilled to the stack, according to its
// register type.
//
// For SparcV9, currently we allocate 8 bytes on stack for all
// register types. We can optimize this later if necessary to save stack
// space (However, should make sure that stack alignment is correct)
//
int getSpilledRegSize(int RegType) const {
return 8;
}
private:
// Number of registers used for passing int args (usually 6: %o0 - %o5)
//
unsigned const NumOfIntArgRegs;
// Number of registers used for passing float args (usually 32: %f0 - %f31)
//
unsigned const NumOfFloatArgRegs;
// The following methods are used to color special live ranges (e.g.
// function args and return values etc.) with specific hardware registers
// as required. See SparcV9RegInfo.cpp for the implementation.
//
void suggestReg4RetAddr(MachineInstr *RetMI,
LiveRangeInfo &LRI) const;
void suggestReg4CallAddr(MachineInstr *CallMI, LiveRangeInfo &LRI) const;
// Helper used by the all the getRegType() functions.
int getRegTypeForClassAndType(unsigned regClassID, const Type* type) const;
public:
// Type of registers available in SparcV9. There can be several reg types
// in the same class. For instace, the float reg class has Single/Double
// types
//
enum RegTypes {
IntRegType,
FPSingleRegType,
FPDoubleRegType,
IntCCRegType,
FloatCCRegType,
SpecialRegType
};
// The actual register classes in the SparcV9
//
// **** WARNING: If this enum order is changed, also modify
// getRegisterClassOfValue method below since it assumes this particular
// order for efficiency.
//
enum RegClassIDs {
IntRegClassID, // Integer
FloatRegClassID, // Float (both single/double)
IntCCRegClassID, // Int Condition Code
FloatCCRegClassID, // Float Condition code
SpecialRegClassID // Special (unallocated) registers
};
SparcV9RegInfo(const SparcV9TargetMachine &tgt);
~SparcV9RegInfo() {
for (unsigned i = 0, e = MachineRegClassArr.size(); i != e; ++i)
delete MachineRegClassArr[i];
}
// Returns the register containing the return address.
// It should be made sure that this register contains the return
// value when a return instruction is reached.
//
unsigned getReturnAddressReg() const;
// Number of registers used for passing int args (usually 6: %o0 - %o5)
// and float args (usually 32: %f0 - %f31)
//
unsigned const getNumOfIntArgRegs() const { return NumOfIntArgRegs; }
unsigned const getNumOfFloatArgRegs() const { return NumOfFloatArgRegs; }
// Compute which register can be used for an argument, if any
//
int regNumForIntArg(bool inCallee, bool isVarArgsCall,
unsigned argNo, unsigned& regClassId) const;
int regNumForFPArg(unsigned RegType, bool inCallee, bool isVarArgsCall,
unsigned argNo, unsigned& regClassId) const;
// method used for printing a register for debugging purposes
//
void printReg(const LiveRange *LR) const;
// To obtain the return value and the indirect call address (if any)
// contained in a CALL machine instruction
//
const Value * getCallInstRetVal(const MachineInstr *CallMI) const;
const Value * getCallInstIndirectAddrVal(const MachineInstr *CallMI) const;
// The following methods are used to generate "copy" machine instructions
// for an architecture. Currently they are used in TargetRegClass
// interface. However, they can be moved to TargetInstrInfo interface if
// necessary.
//
// The function regTypeNeedsScratchReg() can be used to check whether a
// scratch register is needed to copy a register of type `regType' to
// or from memory. If so, such a scratch register can be provided by
// the caller (e.g., if it knows which regsiters are free); otherwise
// an arbitrary one will be chosen and spilled by the copy instructions.
// If a scratch reg is needed, the reg. type that must be used
// for scratch registers is returned in scratchRegType.
//
bool regTypeNeedsScratchReg(int RegType,
int& scratchRegClassId) const;
void cpReg2RegMI(std::vector<MachineInstr*>& mvec,
unsigned SrcReg, unsigned DestReg,
int RegType) const;
void cpReg2MemMI(std::vector<MachineInstr*>& mvec,
unsigned SrcReg, unsigned DestPtrReg,
int Offset, int RegType, int scratchReg = -1) const;
void cpMem2RegMI(std::vector<MachineInstr*>& mvec,
unsigned SrcPtrReg, int Offset, unsigned DestReg,
int RegType, int scratchReg = -1) const;
void cpValue2Value(Value *Src, Value *Dest,
std::vector<MachineInstr*>& mvec) const;
// Get the register type for a register identified different ways.
// Note that getRegTypeForLR(LR) != getRegTypeForDataType(LR->getType())!
// The reg class of a LR depends both on the Value types in it and whether
// they are CC registers or not (for example).
int getRegTypeForDataType(const Type* type) const;
int getRegTypeForLR(const LiveRange *LR) const;
int getRegType(int unifiedRegNum) const;
unsigned getFramePointer() const;
unsigned getStackPointer() const;
};
} // End llvm namespace
#endif // SPARCV9REGINFO_H