Front page | perl.perl5.porters |
Postings from November 2009
Eirik Berg Hanssen wrote:
> karl williamson <public@khwilliamson.com> writes:
>
>> Based on looking at existing code in utf8_heavy.pl, I had presumed
>> that the Perl optimizer would remove code that depended on a constant
>> subroutine that returns false. That is, 'foo if DEBUG' would be
>> optimized away if there was a line: 'sub Debug { 0 }' But that
>> appears to not be the case.
>
> It needs a prototype: 'sub Debug () { 0 }'.
>
> From perlsub:
>
> # Functions with a prototype of "()" are potential candidates for
> # inlining. If the result after optimization and constant folding is
> # either a constant or a lexically‐scoped scalar which has no other
> # references, then it will be used in place of function calls made
> # without "&". Calls made using "&" are never inlined. (See
> # constant.pm for an easy way to declare most constants.)
>
>
> Eirik
I looked and actually it is that:
sub DEBUG () { 0 } # Set to 0 for production; 1 for development
so it isn't getting optimized out, nonetheless.
Thread Previous
|
Thread Next