def smod(evm: Evm) -> None:
"""
Signed modulo remainder of the top two elements of the stack. Pushes the
result back on the stack.
Parameters
----------
evm :
The current EVM frame.
Raises
------
StackUnderflowError
If `len(stack)` is less than `2`.
OutOfGasError
If `evm.gas_left` is less than `5`.
"""
evm.gas_left = subtract_gas(evm.gas_left, GAS_LOW)
x = pop(evm.stack).to_signed()
y = pop(evm.stack).to_signed()
if y == 0:
remainder = 0
else:
remainder = get_sign(x) * (abs(x) % abs(y))
push(evm.stack, U256.from_signed(remainder))
def sdiv(evm: Evm) -> None:
"""
Signed integer division of the top two elements of the stack. Pushes the
result back on the stack.
Parameters
----------
evm :
The current EVM frame.
Raises
------
StackUnderflowError
If `len(stack)` is less than `2`.
OutOfGasError
If `evm.gas_left` is less than `5`.
"""
evm.gas_left = subtract_gas(evm.gas_left, GAS_LOW)
dividend = pop(evm.stack).to_signed()
divisor = pop(evm.stack).to_signed()
if divisor == 0:
quotient = 0
elif dividend == -U255_CEIL_VALUE and divisor == -1:
quotient = -U255_CEIL_VALUE
else:
sign = get_sign(dividend * divisor)
quotient = sign * (abs(dividend) // abs(divisor))
push(evm.stack, U256.from_signed(quotient))
