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Re^3: Benchmark: Constant List in Hash Slice

by dave_the_m (Monsignor)
on Mar 14, 2019 at 15:01 UTC ( [id://1231258]=note: print w/replies, xml ) Need Help??


in reply to Re^2: Benchmark: Constant List in Hash Slice
in thread Benchmark: Constant List in Hash Slice

does this also explain why using a normal @array variable is faster than a constant list?
No. That's because constant arrays are implemented as constant array refs. So 
use constant foo qw(a b c);
@a = $h{foo()}

[download]
is implemented roughly as 
use constant foo [qw(a b c)];
@a = $h{@{foo()}}

[download]
And neither (as far as I'm aware) get the compile-time HEK treatment

Dave.

Replies are listed 'Best First'.
Re^4: Benchmark: Constant List in Hash Slice
by LanX (Saint) on Mar 14, 2019 at 15:33 UTC
    Oh that's good to know, thanks! :)

    Hence constant arrays won't help much for tuning performance.

    Cheers Rolf
    (addicted to the Perl Programming Language :)
    Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

[reply]

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