Beefy Boxes and Bandwidth Generously Provided by pair Networks
Keep It Simple, Stupid
 
PerlMonks  

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Dear Monks,
I have a question about how Perl internally works when returning from subroutines. I'm in a debate about whether it is a meaningful optimization to not use "return" and "return 1" in subroutines. What has been instead been proposed is to do something like this:
use constant Some::Module::TRUE => 1 == 1; use constant Some::Module::FALSE => 1 == 0; sub foo { return; } sub bar { return Some::Module::FALSE; }

Let's say foo() and bar() are called millions of times. The claim is the foo() is creating a new scalar (SV) upon each call and returning it, and that bar() is not making perl internally use more memory/cpu resources than it already has allocated. The claim is that perl does something magical with the result of '1 == 1' and '1 == 0', and does not create a new SV to represent the result of that operation.
However, I would think that something so fundamental as the simple return values from subs would already be optimized internally so as to not add needless overhead.
Can anyone confirm any of this?

Thanks!

In reply to Not returning scalars(SV) to optimize and save memory? by Withigo

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others surveying the Monastery: (2)
    As of 2018-04-25 04:09 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?
      Notices?