First, whats meant by:

I ran into an issue that involved quite low-level transformations and as it turned out

To your comparison: The code sequence (*)

$string='7';
$num=$string+0

[download]
gives (*): 
C:\>perl -MO=Concise,-exec -e"$string='7';$num=$string+0"
1  <0> enter
2  <;> nextstate(main 1 -e:1) v:{
3  <$> const[PV "7"] s
4  <#> gvsv[*string] s
5  <2> sassign vKS/2
6  <;> nextstate(main 1 -e:1) v:{
7  <#> gvsv[*string] s
8  <$> const[IV 0] s
9  <2> add[t4] sK/2
a  <#> gvsv[*num] s
b  <2> sassign vKS/2
c  <@> leave[1 ref] vKP/REFC

[download]

and the sequence (**)

 $string='7';
 $num=int($string)"

[download]

gives (**)

C:\>perl -MO=Concise,-exec -e"$string='7';$num=int($string)"
1  <0> enter
2  <;> nextstate(main 1 -e:1) v:{
3  <$> const[PV "7"] s
4  <#> gvsv[*string] s
5  <2> sassign vKS/2
6  <;> nextstate(main 1 -e:1) v:{
7  <#> gvsv[*string] s
8  <1> int[t4] sK/1
9  <#> gvsv[*num] s
a  <2> sassign vKS/2
b  <@> leave[1 ref] vKP/REFC
-e syntax OK

[download]
The Difference is (*) 
8  <$> const[IV 0] s
9  <2> add[t4] sK/2

[download]
compared to (**) 
8  <1> int[t4] sK/1

[download]

so there shouldn't be too much difference

Regards

mwa

In reply to Re: Converting a string to a real numeric value - what's faster? by mwah
in thread Converting a string to a real numeric value - what's faster? by isync

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, details, 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, summary, 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.