scale.backend.x86
Class X86Machine

java.lang.Object
  scale.common.Machine
      scale.backend.x86.X86Machine

public class X86Machine
extends Machine

This is the base class for all X86 specific information.

$Id: X86Machine.java,v 1.1 2007-11-01 16:52:30 burrill Exp $

Copyright 2008 by the Scale Compiler Group,
Department of Computer Science
University of Massachusetts,
Amherst MA. 01003, USA
All Rights Reserved.

Field Summary

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

X86Machine()
Create a Machine instance for an x86.

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	getAssemblerCommand(int backendFeatures) Return the assembler command appropriate to the architecture.
java.lang.String	getGenericArchitectureName() Return the name of the generic target architecture.
boolean	keepTypeInRegister(Type type, boolean temporary) Return true if a value of the type should be allocated to a register.
boolean	littleEndian() Return true if the machine is little-endian.
protected void	setLongDoubleType() Set the type to be used for the C long double type.
int	stackAlignment(Type type) Return the alignment of things stored on the stack.

Methods inherited from class scale.common.Machine

alignTo, getAsmFileExtension, 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, setup, sGetInstructionCountEstimator

Methods inherited from class java.lang.Object

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

Constructor Detail

X86Machine

public X86Machine()

Create a Machine instance for an x86.

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

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 final 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

getAssemblerCommand

public java.lang.String getAssemblerCommand(int backendFeatures)

Return the assembler command appropriate to the architecture.

Overrides:

getAssemblerCommand in class Machine

Parameters:

backendFeatures - specifies code generation flags such as -g

keepTypeInRegister

public boolean keepTypeInRegister(Type type,
                                  boolean temporary)

Return true if a value of the type should be allocated to a register. If it is volatile or not an atomic type, it probably should not be kept in a register.

Overrides:

keepTypeInRegister in class Machine

Parameters:

type - is the type

temporary - is true if the duration will be short

setLongDoubleType

protected void setLongDoubleType()

Set the type to be used for the C long double type.