def _add(a, b):
assert isinstance(a, FixedPoint)
assert isinstance(b, FixedPoint)
promoted_qformat = QFormat.from_qformats(a.qformat, b.qformat)
result_qformat = QFormat(promoted_qformat.integer_bits + 1, promoted_qformat.fraction_bits)
lhs_op = FixedPoint(a, result_qformat)
rhs_op = FixedPoint(b, result_qformat)
result_numerator = lhs_op._numerator + rhs_op._numerator
return FixedPoint._from_numerator(result_numerator, result_qformat)
def _add(a, b):
assert isinstance(a, FixedPoint)
assert isinstance(b, FixedPoint)
promoted_qformat = QFormat.from_qformats(a.qformat, b.qformat)
result_qformat = QFormat(promoted_qformat.integer_bits + 1,
promoted_qformat.fraction_bits)
lhs_op = FixedPoint(a, result_qformat)
rhs_op = FixedPoint(b, result_qformat)
result_numerator = lhs_op._numerator + rhs_op._numerator
return FixedPoint._from_numerator(result_numerator, result_qformat)
def _truediv(dividend, divisor):
assert isinstance(dividend, FixedPoint)
assert isinstance(divisor, FixedPoint)
result_qformat = QFormat(dividend.qformat.integer_bits + divisor.qformat.fraction_bits + 1,
divisor.qformat.integer_bits + dividend.qformat.fraction_bits)
working_qformat = QFormat.from_qformats(dividend.qformat, divisor.qformat, result_qformat)
lhs_op = FixedPoint(dividend, working_qformat)
rhs_op = FixedPoint(divisor, working_qformat)
# We use Fraction's round() here rather than floor division to get correct rounding
working_numerator = round(Fraction(lhs_op._numerator * working_qformat.denominator, rhs_op._numerator))
working_result = FixedPoint._from_numerator(working_numerator, working_qformat)
return FixedPoint(working_result, result_qformat)
def _truediv(dividend, divisor):
assert isinstance(dividend, FixedPoint)
assert isinstance(divisor, FixedPoint)
result_qformat = QFormat(
dividend.qformat.integer_bits + divisor.qformat.fraction_bits + 1,
divisor.qformat.integer_bits + dividend.qformat.fraction_bits)
working_qformat = QFormat.from_qformats(dividend.qformat, divisor.qformat,
result_qformat)
lhs_op = FixedPoint(dividend, working_qformat)
rhs_op = FixedPoint(divisor, working_qformat)
# We use Fraction's round() here rather than floor division to get correct rounding
working_numerator = round(
Fraction(lhs_op._numerator * working_qformat.denominator,
rhs_op._numerator))
working_result = FixedPoint._from_numerator(working_numerator,
working_qformat)
return FixedPoint(working_result, result_qformat)
