-//===-- SparcRegInfo.h - Define TargetRegInfo for Sparc ---------*- C++ -*-===//
-//
+//===-- 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 class implements the virtual class TargetRegInfo for Sparc.
+// This file is used to describe the register file of the SparcV9 target to
+// its register allocator.
//
-//----------------------------------------------------------------------------
+//===----------------------------------------------------------------------===//
-#ifndef SPARC_REGINFO_H
-#define SPARC_REGINFO_H
+#ifndef SPARCV9REGINFO_H
+#define SPARCV9REGINFO_H
-#include "llvm/Target/TargetRegInfo.h"
+#include "llvm/ADT/hash_map"
+#include <string>
+#include <cassert>
namespace llvm {
-class SparcTargetMachine;
+class TargetMachine;
+class IGNode;
+class Type;
+class Value;
+class LiveRangeInfo;
+class Function;
+class V9LiveRange;
+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.
-class SparcRegInfo : public TargetRegInfo {
+public:
+ virtual ~TargetRegClassInfo() {}
-private:
+ 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 ⌖
+
+ // 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;
// 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 SparcRegInfo.cpp for the implementation.
+ // as required. See SparcV9RegInfo.cpp for the implementation.
//
- void suggestReg4RetAddr(MachineInstr *RetMI,
- LiveRangeInfo &LRI) const;
+ 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 Sparc. There can be several reg types
+ // 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
//
SpecialRegType
};
- // The actual register classes in the Sparc
+ // The actual register classes in the SparcV9
//
- // **** WARNING: If this enum order is changed, also modify
- // getRegisterClassOfValue method below since it assumes this particular
+ // **** WARNING: If this enum order is changed, also modify
+ // getRegisterClassOfValue method below since it assumes this particular
// order for efficiency.
- //
- enum RegClassIDs {
+ //
+ enum RegClassIDs {
IntRegClassID, // Integer
FloatRegClassID, // Float (both single/double)
IntCCRegClassID, // Int Condition Code
SpecialRegClassID // Special (unallocated) registers
};
- SparcRegInfo(const SparcTargetMachine &tgt);
+ SparcV9RegInfo(const SparcV9TargetMachine &tgt);
- // 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;
-
- // getZeroRegNum - returns the register that contains always zero this is the
- // unified register number
- //
- virtual unsigned getZeroRegNum() const;
-
- // getCallAddressReg - returns the reg used for pushing the address when a
- // function is called. This can be used for other purposes between calls
- //
- unsigned getCallAddressReg() const;
+ ~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
+ // It should be made sure that this register contains the return
// value when a return instruction is reached.
//
unsigned getReturnAddressReg() const;
//
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;
-
- // 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 SparcRegInfo.cpp for the implementation for Sparc.
- //
- void suggestRegs4MethodArgs(const Function *Meth,
- LiveRangeInfo& LRI) const;
-
- void suggestRegs4CallArgs(MachineInstr *CallMI,
- LiveRangeInfo& LRI) const;
- void suggestReg4RetValue(MachineInstr *RetMI,
- LiveRangeInfo& LRI) const;
-
- void colorMethodArgs(const Function *Meth, LiveRangeInfo& LRI,
- std::vector<MachineInstr*>& InstrnsBefore,
- std::vector<MachineInstr*>& InstrnsAfter) const;
// method used for printing a register for debugging purposes
//
- void printReg(const LiveRange *LR) const;
-
- // returns the # of bytes of stack space allocated for each register
- // type. For Sparc, 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)
- //
- inline int getSpilledRegSize(int RegType) const {
- return 8;
- }
+ void printReg(const V9LiveRange *LR) const;
// To obtain the return value and the indirect call address (if any)
// contained in a CALL machine instruction
const Value * getCallInstIndirectAddrVal(const MachineInstr *CallMI) const;
// The following methods are used to generate "copy" machine instructions
- // for an architecture.
+ // 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;
// 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 getRegTypeForLR(const V9LiveRange *LR) const;
int getRegType(int unifiedRegNum) const;
- virtual unsigned getFramePointer() const;
- virtual unsigned getStackPointer() const;
+ unsigned getFramePointer() const;
+ unsigned getStackPointer() const;
};
} // End llvm namespace
-#endif
+#endif // SPARCV9REGINFO_H
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