scale.backend.ppc
Class PPCMachine

java.lang.Object
  scale.common.Machine
      scale.backend.ppc.PPCMachine

public class PPCMachine
extends Machine

This is the base class for all PPC specific information.

$Id: PPCMachine.java,v 1.31 2007-11-01 16:52:28 burrill Exp $

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

Field Summary

static int	G4 Specifies the G4 32-bit PowerPC.
static int	G5 Specifies the G5 64-bit PowerPC.
static int	LINUX Specifies the linux operating system.
static int	MACOSX Specifies the mac os x operating system.

Fields inherited from class scale.common.Machine

ALL_CONDITIONAL_MOVES, cacheLineSize, currentMachine, doubleType, floatCalcType, floatType, HAS_EXPENSIVE_SUBROUTINE_CALLS, HAS_FF_CONDITIONAL_MOVE, HAS_FI_CONDITIONAL_MOVE, HAS_IF_CONDITIONAL_MOVE, HAS_II_CONDITIONAL_MOVE, HAS_INT_FROM_FP_CMP, HAS_NO_FP_DIVIDE, HAS_NO_INT_DIVIDE, HAS_NON_VOLATILE_FP_REGS, HAS_PREDICATION, HAS_SIMPLE_FLOOR, HAS_WHILE_LOOP_UNROLL_BENEFIT, intCalcType, longDoubleType, ptrdifftType, signedCharType, signedIntType, signedLongLongType, signedLongType, signedShortType, sizetType, smallestAddressableUnitType, unsignedCharType, unsignedIntType, unsignedLongLongType, unsignedLongType, unsignedShortType, vaListType, voidStarType, wchartType

Constructor Summary

PPCMachine()
Create a Machine instance for an PPC.

Method Summary

void	addCPPFlags(Vector<java.lang.String> v) Add the flags necessary for the C preprocessor.
int	addressableMemoryUnits(int bitSize) Return the number of addressable units required
int	alignData(int dataSize) Return the integer value alignmentthat satisfies (0 == address % alignment) for the data size specified.
java.lang.String	determineArchitecture(java.lang.String architecture, java.lang.String extension) Determine the architecture sub-type.
int	executionCostEstimate(double value) Return an estimate of the execution cost to provide this value.
int	executionCostEstimate(long value) Return an estimate of the execution cost to provide this value.
int	generalAlignment() Return the most general purpose alignment in memory units.
java.lang.String	getArchitectureName() Return the name of the specific target architecture.
java.lang.String	getGenericArchitectureName() Return the name of the generic target architecture.
int	getISA() Return the specific instruction set architecture.
int	getOS() Return the specific operating system.
boolean	keepTypeInRegister(Type type, boolean temporary) Should a value of this type be allocated to a register?
boolean	littleEndian() Return true if the machine is little-endian.
protected void	setup() Setup this instance of the machine.
int	stackAlignment(Type type) Return the alignment of things stored on the stack.

Methods inherited from class scale.common.Machine

alignTo, getAsmFileExtension, getAssemblerCommand, getAssemblerCommand, getCacheSize, getCodeGenerator, getDoubleType, getFloatType, getFunctionalUnitDescriptions, getInstructionCountEstimator, getIntegerCalcType, getLongDoubleType, getMaxBlockSize, getPtrdifftType, getRealCalcType, getSignedCharType, getSignedIntType, getSignedLongLongType, getSignedLongType, getSignedShortType, getSizetType, getSmallestAddressableUnitType, getUnsignedCharType, getUnsignedIntType, getUnsignedLongLongType, getUnsignedLongType, getUnsignedShortType, getVaListType, getVoidStarType, getWchartType, hasCapabilities, hasCapability, maxBitFieldSize, setup, sGetInstructionCountEstimator

Methods inherited from class java.lang.Object

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

Field Detail

G4

public static final int G4

Specifies the G4 32-bit PowerPC.

See Also:

Constant Field Values

G5

public static final int G5

Specifies the G5 64-bit PowerPC.

See Also:

Constant Field Values

LINUX

public static final int LINUX

Specifies the linux operating system.

See Also:

Constant Field Values

MACOSX

public static final int MACOSX

Specifies the mac os x operating system.

See Also:

Constant Field Values

Constructor Detail

PPCMachine

public PPCMachine()

Create a Machine instance for an PPC.

Method Detail

getGenericArchitectureName

public java.lang.String getGenericArchitectureName()

Return the name of the generic target architecture.

Specified by:

getGenericArchitectureName in class Machine

getArchitectureName

public java.lang.String getArchitectureName()

Return the name of the specific target architecture.

Specified by:

getArchitectureName in class Machine

determineArchitecture

public java.lang.String determineArchitecture(java.lang.String architecture,
                                              java.lang.String extension)
                                       throws java.lang.Exception

Determine the architecture sub-type.

Specified by:

determineArchitecture in class Machine

Parameters:

architecture - specifies the target architecture

extension - specifies an extension to the a target architecture

Returns:

the name of the specific target architecture generator class.

Throws:

java.lang.Exception - if the extension is not understood

getISA

public final int getISA()

Return the specific instruction set architecture.

getOS

public final int getOS()

Return the specific operating system.

alignData

public int alignData(int dataSize)

Return the integer value alignmentthat satisfies (0 == address % alignment) for the data size specified.

Specified by:

alignData in class Machine

Parameters:

dataSize - is the size of the data in addressable units.

addressableMemoryUnits

public int addressableMemoryUnits(int bitSize)

Return the number of addressable units required

Specified by:

addressableMemoryUnits in class Machine

Parameters:

bitSize - is the number of bits required for the data

executionCostEstimate

public int executionCostEstimate(long value)

Return an estimate of the execution cost to provide this value. The cost should be zero if the value can be represented as a hard-wired register or in the immediate field of an instruction. The cost is relative to the cost of other operations; a good metric is the number of cycles needed to generate the value or load it from memory.

Specified by:

executionCostEstimate in class Machine

executionCostEstimate

public int executionCostEstimate(double value)

Return an estimate of the execution cost to provide this value. The cost should be zero if the value can be represented as a hard-wired register or in the immediate field of an instruction. The cost is relative to the cost of other operations; a good metric is the number of cycles needed to generate the value or load it from memory.

Specified by:

executionCostEstimate in class Machine

addCPPFlags

public void addCPPFlags(Vector<java.lang.String> v)

Add the flags necessary for the C preprocessor.

Specified by:

addCPPFlags in class Machine

generalAlignment

public int generalAlignment()

Return the most general purpose alignment in memory units.

Specified by:

generalAlignment in class Machine

stackAlignment

public final int stackAlignment(Type type)

Return the alignment of things stored on the stack.

Specified by:

stackAlignment in class Machine

littleEndian

public boolean littleEndian()

Return true if the machine is little-endian.

Specified by:

littleEndian in class Machine

keepTypeInRegister

public boolean keepTypeInRegister(Type type,
                                  boolean temporary)

Should a value of this type be allocated to a register?

Overrides:

keepTypeInRegister in class Machine

Parameters:

type - is the type

temporary - is true if the duration will be short super.keepTypeInRegister() takes care of what we need to do. We only need to ensure that aggregates (structs, unions, etc.) are not put in registers.

setup

protected void setup()

Description copied from class: Machine

Setup this instance of the machine. Each code generator should implement this method. For example

   protected void setup()
   {
     super.setup(); // Initialize type, etc that are not set here.
 
     // Specify the types that are different.
 
     PointerType.setMinBitSize(64);
     intCalcType = scale.clef.type.SignedIntegerType.create(64);
     ....
   }
 

Overrides:

setup in class Machine