@instruction<EOL><INDENT>def JECXZ(cpu, target):<DEDENT>
cpu.PC = Operators.ITEBV(cpu.address_bit_size, cpu.ECX == <NUM_LIT:0>, target.read(), cpu.PC)<EOL>
Jumps short if ECX register is 0.

:param cpu: current CPU.
:param target: destination operand.