function labs( x ) {
	var mask;
	var y;

	y = x|0; // asm type annotation
	mask = ( y >> 31 )|0; // asm type annotation
	return ((y ^ mask) - mask)|0; // asm type annotation
}
Computes an absolute value of a signed 32-bit integer in two's complement format.

## Method

-   Assume two's complement format.
-   Create a mask by applying a sign propagating right-shift. For negative integers, this results in all `1`'s. For nonnegative integers, this results in all `0`'s.
-   XOR the mask with `x`. For negative integers, this is the equivalent of a NOT. For nonnegative integers, this is a no-op.
-   Subtract the mask to recover the absolute value. For negative integers, this adds `1`, which is `-x` when using two's complement. For nonnegative integers, this subtracts `0`.

@param {integer32} x - integer
@returns {integer32} absolute value

@example
var v = labs( -10|0 );
// returns 10