comment on

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

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