/** * Logical Left Shift * * Shifts BigInteger's by $shift bits, effectively multiplying by 2**$shift. * * @param Integer $shift * @return BigInteger * @access public * @internal The only version that yields any speed increases is the internal version. */ function bitwise_leftShift($shift) { $temp = new BigInteger(); switch (MATH_BIGINTEGER_MODE) { case MATH_BIGINTEGER_MODE_GMP: static $two; if (!isset($two)) { $two = gmp_init('2'); } $temp->value = gmp_mul($this->value, gmp_pow($two, $shift)); break; case MATH_BIGINTEGER_MODE_BCMATH: $temp->value = bcmul($this->value, bcpow('2', $shift, 0), 0); break; default: // could just replace _rshift with this, but then all _lshift() calls would need to be rewritten // and I don't want to do that... $temp->value = $this->value; $temp->_lshift($shift); } return $this->_normalize($temp); }