What does it depend on?
On Thursday, April 17, 2025 at 12:48:26 AM UTC+3 Ben Noordhuis wrote:
> On Wed, Apr 16, 2025 at 8:21 PM GregRos <work....@gmail.com> wrote:
> >
> > I'm writing a low-level, CPU-bound parsing library, and I want to make
> sure the parsing code is as efficient as possible.
> >
> > I know that V8 will sometimes inline function calls if they're "simple"
> enough, don't contain any blacklisted syntax, etc.
> >
> > But will it do the same with instance method calls? For example, let's
> say I just have a very simple wrapper like this:
> >
> > class X {
> > arr
> > constructor(arr) {
> > this.arr = arr
> > }
> >
> > push(x) {
> > this.arr.push(x)
> > }
> > }
> >
> > Would a call like `x.push(1)` get inlined into `x.arr.push(1)`?
> >
> > If so, what if I complicate things a bit:
> >
> > If `push` instead calls another instance method. Would both calls get
> inlined?
> > If it's an inherited method up the prototype chain (but is never
> overriden)
> > If push calls a function in a variable, like if it received a function
> argument and called it. Would the body of push get inlined even if the
> internal call cannot be inlined?
>
> Depends. Probably, but...
>
> The optimizing tiers are pretty good at inlining (it isn't called the
> mother of all optimizations for nothing) but JIT compilers are, by
> necessity, a bunch of heuristics and estimates, and they change all
> the time. What works today need not work tomorrow.
>
> In general, it's best to write your code in a straightforward manner
> and not worry too much about performance upfront. V8 generally does a
> lot better on mundane code than code that tries to be clever because
> the former is its bread and butter. Only start thinking about tuning
> when profiling shows hot spots.
>
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