div_ties_to_zero is useful because it is the fastest tie-breaking rounding mode. Since the underlying instruction rounds toward zero, div_ties_to_zero only needs to detect the case where the quotient is rounded to the integer greater in magnitude. Both the downwards case and tie-breaking case are handled in one.
div_ties_to_zerois useful because it is the fastest tie-breaking rounding mode. Since the underlying instruction rounds toward zero,div_ties_to_zeroonly needs to detect the case where the quotient is rounded to the integer greater in magnitude. Both the downwards case and tie-breaking case are handled in one.