/**
* 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);
}
