(2014/08/11 22:37), P8 wrote:
> So that means V8 actually performs additional value checks (or
> conditions based on the flags register or something) under the surface
> after all such math operations? So that the machine code it compiles has
> conditional branches based on overflow?
Actually not "all". For example in
funciont add1(a, b) { return a + b; }
function add2(a, b) { return (a + b) | 0; }
add2() doesn't have the overflow check. All what I tried to say is that
add1() still returns SMI if the result falls in the SMI range.
I guess you can try to eliminate overflow checks with an approach like
add2 but I would not put that on top of my priority :) (Also, in this
particular example add2 might actually be slower for other reasons.)
Cheers,
Kenny
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