> On 22 Nov 2017, at 19:31, Timo Paulssen via RT <perl6-bugs-follo...@perl.org>
> wrote:
> On Mon, 20 Nov 2017 12:13:47 -0800, ronaldxs wrote:
>> What about a native perl6 range loop? Couldn't there be some way for
>> Perl 6 / Rakudo to generate code competitive on a small range with the
>> "native-loop" example?
>>
>> perl6 -e '
>> {
>> my int ($a, $one, $three) = (42, 1, 3);
>> for ^10_000_000 { $a += $one + $a%$three };
>> say now - ENTER now;
>> say $a
>> }'
>
> This code will actually be turned into a `loop` loop by the optimizer at
> compile time. If you type the block to have a signature of `-> int $_ -->
> Nil` it'll get faster.
So, is there a reason we don’t do this on all ^10000 type loops that don’t
expect the return value to be used? Because in my benchmarks, this is 3x as
fast! With only 25% of the allocations, so a lot less GC churn!
> The optimizer doesn't do anything like that for the `^$limit` case, however.
That feels more that it needs a smarter spesh to me?
Liz
