Python signed_to_unsigned示例

示例#1

文件： comparison.py 项目： divyanks/py-evm-1

def sgt(computation):
    """
    Signed Greater Comparison
    """
    left, right = map(
        unsigned_to_signed,
        computation.stack_pop(num_items=2, type_hint=constants.UINT256),
    )

    if left > right:
        result = 1
    else:
        result = 0

    computation.stack_push(signed_to_unsigned(result))

示例#2

def slt(computation: BaseComputation) -> None:
    """
    Signed Lesser Comparison
    """
    left, right = map(
        unsigned_to_signed,
        computation.stack_pop(num_items=2, type_hint=constants.UINT256),
    )

    if left < right:
        result = 1
    else:
        result = 0

    computation.stack_push(signed_to_unsigned(result))

示例#3

def smod(computation):
    """
    Signed Modulo
    """
    value, mod = map(
        unsigned_to_signed,
        computation.stack_pop(num_items=2, type_hint=constants.UINT256),
    )

    pos_or_neg = -1 if value < 0 else 1

    if mod == 0:
        result = 0
    else:
        result = (abs(value) % abs(mod) * pos_or_neg) & constants.UINT_256_MAX

    computation.stack_push(signed_to_unsigned(result))

示例#4

def sdiv(computation):
    """
    Signed Division
    """
    numerator, denominator = map(
        unsigned_to_signed,
        computation.stack_pop(num_items=2, type_hint=constants.UINT256),
    )

    pos_or_neg = -1 if numerator * denominator < 0 else 1

    if denominator == 0:
        result = 0
    else:
        result = (pos_or_neg * (abs(numerator) // abs(denominator)))

    computation.stack_push(signed_to_unsigned(result))