scale.backend.trips2
Class Trips2RegisterSet

java.lang.Object
  scale.backend.RegisterSet
      scale.backend.trips2.Trips2RegisterSet

public class Trips2RegisterSet
extends RegisterSet

This class describes the register set of the TRIPS Grid Processor.

$Id: Trips2RegisterSet.java,v 1.26 2007-08-27 18:30:14 burrill Exp $

Copyright 2007 by the Scale Compiler Group,
Department of Computer Science
University of Massachusetts,
Amherst MA. 01003, USA
All Rights Reserved.

TRIPS has 128 programmable registers and makes no distinction between floating point and integer registers.

Reg #	Usage
R0	Program Counter (PC)
R1	Stack Pointer (SP)
R2	Link Register (LR)
R3	First Argument and Return Values
R4 - R10	Arguments
R11	Global Pointer/Reserved
R12 - R69	Local Variables
R70 - R126	Scratch Variables
R17	Reserved

Field Summary

static int	bankAccesses Specify the number of registers in a bank that can be accessed in the same block.
static int	FF_REG First floating point argument register.
static int	FL_REG Last floating point argument register.
static int	FP_REG Frame pointer register.
static int	FR_REG Floating point function value return register.
static int	FREG_SIZE Size in bytes of integer register.
static int	IF_REG First argument register.
static int	IL_REG Last rgument register.
static int	IR_REG Function value return register.
static int	IREG_SIZE Size in bytes of integer register.
static int	numBanks Specify the number of banks that (real) registers are divided into.
static int	perBlockRegAccesses Specify the number of register accesses allowed in the same block.
static int	RA_REG Return address register.
static int	regSetSize Specify the number of actual (real) registers.
static int	SP_REG Stack pointer register.

Fields inherited from class scale.backend.RegisterSet

ADRREG, AFIREG, AIREG, checkMask, CNTREG, DBLEREG, FIREG, FLTREG, INTREG, nextRegister, PAIRREG, QUADREG, RDREG, registers, sizeMask, SPCREG, typeMask

Constructor Summary

Trips2RegisterSet()

Method Summary

int	getBank(int reg) Return which bank a given (real) register is in.
short[]	getCalleeSaves() Return the callee saves registers.
short[]	getCalleeUses() Return the callee uses registers.
short[]	getPreferredOrder() Return a mapping from an order index to a real register number.
int	numAllocatableRegisters() Return the number of unique registers that can hold programmer values.
java.lang.String	predicateRegisterName(int reg) Convert a predicate register number into its assembly language form.
java.lang.String	registerName(int reg) Convert a register number into its assembly language form.
int	registerSize(int reg) Return the size of the register in addressable memory units.
protected void	setLowTmpReg(int lowTempReg) Update the register allocator with the lowest used temp register for the current routine.
protected void	setRegisters(int[] map, int nextRegister) Update the registers array and next temp register.
int	tempRegisterType(Type type, long bs) Return the register type with the size information added.
boolean	useContiguous() Return true if virtual registers, that require more than one real register, must be allocated to contiguous real registers.

Methods inherited from class scale.backend.RegisterSet

actualRegister, adrRegister, compatible, compatibleNS, continueRegister, display, doubleRegister, floatRegister, getResultRegister, getType, initialize, intRegister, isAdrType, isContinueType, isDoubleType, isFloatType, isIntType, isModType, isPairType, isQuadType, isReadOnlyType, isSpecialType, lastRegister, modRegister, newTempRegister, numContiguousRegisters, numContiguousType, numRealRegisters, numRegisters, pairRegister, quadRegister, rangeBegin, rangeEnd, readOnlyRegister, setResultRegister, specialRegister, tempRegister, tempRegisterType, virtualRegister

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

IR_REG

public static final int IR_REG

Function value return register.

See Also:

Constant Field Values

IF_REG

public static final int IF_REG

First argument register.

See Also:

Constant Field Values

IL_REG

public static final int IL_REG

Last rgument register.

See Also:

Constant Field Values

RA_REG

public static final int RA_REG

Return address register.

See Also:

Constant Field Values

SP_REG

public static final int SP_REG

Stack pointer register.

See Also:

Constant Field Values

FP_REG

public static final int FP_REG

Frame pointer register. For most functions the frame pointer register is not used. If the function calls alloca the frame pointer register is used to access the function's stack frame while allowing the stack pointer to be changed by alloca which allocates space for the user on the stack. Upon entry to these functions, the address in the stack pointer register is decremented and this address is then copied into the frame pointer register. The address in the frame pointer register is copied back into the stack pointer register just before the stack pointer register is incremented upon function return.

See Also:

Constant Field Values

FR_REG

public static final int FR_REG

Floating point function value return register.

See Also:

Constant Field Values

FF_REG

public static final int FF_REG

First floating point argument register.

See Also:

Constant Field Values

FL_REG

public static final int FL_REG

Last floating point argument register.

See Also:

Constant Field Values

IREG_SIZE

public static final int IREG_SIZE

Size in bytes of integer register.

See Also:

Constant Field Values

FREG_SIZE

public static final int FREG_SIZE

Size in bytes of integer register.

See Also:

Constant Field Values

regSetSize

public static int regSetSize

Specify the number of actual (real) registers. Default is 128 registers. The maximum allowed value is 1024 and the minimum allowed value is 16.

numBanks

public static int numBanks

Specify the number of banks that (real) registers are divided into. Default is 4 banks. Which bank a register is in is determined by RegNum % NumBanks.

bankAccesses

public static int bankAccesses

Specify the number of registers in a bank that can be accessed in the same block. Default is 8 registers. The size of the register set should be evenly divisible by the number of banks.

perBlockRegAccesses

public static int perBlockRegAccesses

Specify the number of register accesses allowed in the same block. This is equal to the number of banks * number of allowed bank accesses/block.

Constructor Detail

Trips2RegisterSet

public Trips2RegisterSet()

Method Detail

setLowTmpReg

protected void setLowTmpReg(int lowTempReg)

Update the register allocator with the lowest used temp register for the current routine. Should be called just prior to generating code for this routine.

registerName

public java.lang.String registerName(int reg)

Convert a register number into its assembly language form.

Specified by:

registerName in class RegisterSet

predicateRegisterName

public java.lang.String predicateRegisterName(int reg)

Convert a predicate register number into its assembly language form.

getBank

public int getBank(int reg)

Return which bank a given (real) register is in.

getPreferredOrder

public short[] getPreferredOrder()

Return a mapping from an order index to a real register number. This mapping allows the order of allocation of real registers to be specified.

Overrides:

getPreferredOrder in class RegisterSet

useContiguous

public boolean useContiguous()

Return true if virtual registers, that require more than one real register, must be allocated to contiguous real registers.

Overrides:

useContiguous in class RegisterSet

registerSize

public int registerSize(int reg)

Return the size of the register in addressable memory units.

Specified by:

registerSize in class RegisterSet

getCalleeSaves

public short[] getCalleeSaves()

Return the callee saves registers.

Specified by:

getCalleeSaves in class RegisterSet

getCalleeUses

public short[] getCalleeUses()

Return the callee uses registers.

Specified by:

getCalleeUses in class RegisterSet

numAllocatableRegisters

public int numAllocatableRegisters()

Return the number of unique registers that can hold programmer values.

Specified by:

numAllocatableRegisters in class RegisterSet

Returns:

the number of unique registers that can hold programmer values.

tempRegisterType

public int tempRegisterType(Type type,
                            long bs)

Return the register type with the size information added.

Specified by:

tempRegisterType in class RegisterSet

Parameters:

type - is the type required

bs - is the size required

setRegisters

protected void setRegisters(int[] map,
                            int nextRegister)

Update the registers array and next temp register.