def _neg32(ins):
    """ Negates top of the stack (32 bits in DEHL)
    """
    output = _32bit_oper(ins.quad[2])
    output.append('call __NEG32')
    output.append('push de')
    output.append('push hl')
    REQUIRES.add('neg32.asm')
    return output
Negates top of the stack (32 bits in DEHL)