scale.backend.alpha
Class AlphaRegisterSet

java.lang.Object
  scale.backend.RegisterSet
      scale.backend.alpha.AlphaRegisterSet

public class AlphaRegisterSet
extends RegisterSet

This class describes the register set of the Alpha.

$Id: AlphaRegisterSet.java,v 1.26 2007-03-21 13:31:46 burrill Exp $

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

The Alpha has 64 programmable registers. The first 31 registers are used for integer values and addresses. This includes the stack pointer and other housekeeping registers. Registers 31 and 63 contain a hardwired 0 value. Registers 32 through 62 are used for floating point values.

Field Summary

static int	AT_REG Used by the assembler.
static int	F0_REG Floating point zero register.
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	GP_REG Global Pointer register
static int	I0_REG Integer zero register
static int	IF_REG First integer argument register.
static int	IL_REG Last integer argument register.
static int	IR_REG Integer function value return register.
static int	IREG_SIZE Size in bytes of integer register.
static int	PV_REG Routine address register.
static int	RA_REG Return address register
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

AlphaRegisterSet()

Method Summary

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	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.
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

Integer function value return register.

See Also:

Constant Field Values

FP_REG

public static final int FP_REG

Frame pointer register

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Constant Field Values

IF_REG

public static final int IF_REG

First integer argument register.

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Constant Field Values

IL_REG

public static final int IL_REG

Last integer argument register.

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Constant Field Values

RA_REG

public static final int RA_REG

Return address register

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Constant Field Values

PV_REG

public static final int PV_REG

Routine address register.

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Constant Field Values

AT_REG

public static final int AT_REG

Used by the assembler.

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Constant Field Values

GP_REG

public static final int GP_REG

Global Pointer register

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Constant Field Values

SP_REG

public static final int SP_REG

Stack pointer register

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Constant Field Values

I0_REG

public static final int I0_REG

Integer zero register

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Constant Field Values

FR_REG

public static final int FR_REG

Floating point function value return register.

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Constant Field Values

FF_REG

public static final int FF_REG

First floating point argument register.

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Constant Field Values

FL_REG

public static final int FL_REG

Last floating point argument register.

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Constant Field Values

F0_REG

public static final int F0_REG

Floating point zero register.

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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

Constructor Detail

AlphaRegisterSet

public AlphaRegisterSet()

Method Detail

registerName

public java.lang.String registerName(int reg)

Convert a register number into its assembly language form.

Specified by:

registerName in class RegisterSet

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