Function _rshift_nearest

Lib/_pydecimal.py:5689–5695

Given an integer x and a nonnegative integer shift, return closest integer to x / 2**shift; use round-to-even in case of a tie.

(x, shift)

    return a

def _rshift_nearest(x, shift):
    """Given an integer x and a nonnegative integer shift, return closest
    integer to x / 2**shift; use round-to-even in case of a tie.

    """
    b, q = 1 << shift, x >> shift
    return q + (2*(x & (b-1)) + (q&1) > b)

def _div_nearest(a, b):
    """Closest integer to a/b, a and b positive integers; rounds to even