Constant expression elimination

[ikskuh]

Allow the compiler to precalculate constant expressions to reduce runtime overhead.

Example:

var foo = 10 * 3 + 2;

can be optimized to

var foo = 32;

This can even propagate through variables as the compiler can detect whether variables will be reassigned or not, allowing global constant folding:

var PI = 3.14;

function Rad2Deg(r) {
    return r * 180 / PI; // this can be folded into a single multiplication
}