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// $Id$
//***************************************************************************
// File:
// TargetMachine.cpp
//
// Purpose:
//
// History:
// 7/12/01 - Vikram Adve - Created
//**************************************************************************/
//*************************** User Include Files ***************************/
#include "llvm/CodeGen/TargetMachine.h"
#include "llvm/DerivedTypes.h"
//************************ Exported Constants ******************************/
// External object describing the machine instructions
// Initialized only when the TargetMachine class is created
// and reset when that class is destroyed.
//
const MachineInstrDescriptor* TargetInstrDescriptors = NULL;
//************************ Class Implementations **************************/
//---------------------------------------------------------------------------
// class TargetMachine
//
// Purpose:
// Machine description.
//
//---------------------------------------------------------------------------
// function TargetMachine::findOptimalStorageSize
//
// Purpose:
// This default implementation assumes that all sub-word data items use
// space equal to optSizeForSubWordData, and all other primitive data
// items use space according to the type.
//
unsigned int TargetMachine::findOptimalStorageSize(const Type* ty) const {
switch(ty->getPrimitiveID()) {
case Type::BoolTyID:
case Type::UByteTyID:
case Type::SByteTyID:
case Type::UShortTyID:
case Type::ShortTyID:
return optSizeForSubWordData;
default:
return DataLayout.getTypeSize(ty);
}
}
//---------------------------------------------------------------------------
// class MachineInstructionInfo
// Interface to description of machine instructions
//---------------------------------------------------------------------------
/*ctor*/
MachineInstrInfo::MachineInstrInfo(const MachineInstrDescriptor* _desc,
unsigned int _descSize)
: desc(_desc), descSize(_descSize)
{
assert(TargetInstrDescriptors == NULL && desc != NULL);
TargetInstrDescriptors = desc; // initialize global variable
}
/*dtor*/
MachineInstrInfo::~MachineInstrInfo()
{
TargetInstrDescriptors = NULL; // reset global variable
}
bool
MachineInstrInfo::constantFitsInImmedField(MachineOpCode opCode,
int64_t intValue) const
{
// First, check if opCode has an immed field.
bool isSignExtended;
uint64_t maxImmedValue = this->maxImmedConstant(opCode, isSignExtended);
if (maxImmedValue != 0)
{
// Now check if the constant fits
if (intValue <= (int64_t) maxImmedValue &&
intValue >= -((int64_t) maxImmedValue+1))
return true;
}
return false;
}
//---------------------------------------------------------------------------
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