public static WordField LoadFromRegister(FieldSpec fieldSpec, Register register)
{
int fieldSpecByteCount = fieldSpec.ByteCount;
if (fieldSpecByteCount > register.ByteCountWithPadding)
{
throw new ArgumentOutOfRangeException(nameof(fieldSpec), fieldSpec, "bytecount too large for this register");
}
var field = new WordField(fieldSpec, fieldSpecByteCount);
int fromRegisterStartIndex = register.ByteCountWithPadding - fieldSpecByteCount;
fieldSpecByteCount--;
while (fieldSpecByteCount >= 0)
{
field[fieldSpecByteCount] = register.GetByteWithPadding(fromRegisterStartIndex + fieldSpecByteCount);
fieldSpecByteCount--;
}
if (fieldSpec.IncludesSign)
{
field.Sign = register.Sign;
}
return(field);
}
public static WordField LoadFromFullWord(FieldSpec fieldSpec, IFullWord word)
{
int fieldSpecByteCount = fieldSpec.ByteCount;
var field = new WordField(fieldSpec, fieldSpecByteCount);
int lowBoundByteIndex = fieldSpec.LowBoundByteIndex;
for (int i = 0; i < fieldSpecByteCount; i++)
{
field[i] = word[lowBoundByteIndex + i];
}
if (fieldSpec.IncludesSign)
{
field.Sign = word.Sign;
}
return(field);
}
