[pypy-dev] can_enter_jit - what is it and did something change?
Yuriy Taraday
yorik.sar at gmail.com
Mon Jan 12 00:06:13 CET 2015
Thanks for quick reply!
On Mon, Jan 12, 2015 at 1:50 AM, Armin Rigo <arigo at tunes.org> wrote:
> Hi Yuriy,
>
> On 11 January 2015 at 23:38, Yuriy Taraday <yorik.sar at gmail.com> wrote:
> > - Did something change wrt can_enter_jit since that code had been
> written? I
> > mean besides check that raises that error [3].
>
> No. There are probably cases where that check fails but the code was
> still correct; I bet it was the case in 'lang-js' (or, actually, I
> *hope* it was correct in the first place!).
>
> You're correct in killing 'can_enter_jit' completely. As you found
> out, it doesn't have any impact on the performance of JIT-generated
> code; it only impacts the performance of JITting itself. Nowadays it
> is considered an "advanced hint" only.
>
Ok, I will. But I'm still curious about other questions though.
Can you point me in the direction where can I dig for answers?
--
Kind regards, Yuriy.
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