It seems that your output and the output of BrowserUk brings the different results ( Re^5: counting backward (optimize foreach reverse low .. high ).
I noticed that you print in the loop and BrowserUk calls '1'. I tried to run the both versions and found that it brings the different results indeed:
Loops with print (I used a NULL device to keep it clear, s.below):
Rate foreach_loop c_for_loop
foreach_loop 256/s -- -8%
c_for_loop 278/s 8% --
Loops with '1':
Rate c_for_loop foreach_loop
c_for_loop 1314/s -- -22%
foreach_loop 1674/s 27% --
The code (your code :-):
PM Thread perlquestion [id://1021418]
use Benchmark qw( cmpthese );
my $n = 1e4;
my $null = IO::Null->new;
foreach_loop => \&foreach_loop,
c_for_loop => \&c_for_loop,
for my $i (-$n .. 0)
# $null->print( -$i );
for (my $j = $n; $j >= 0; --$j)
# $null->print( $j );
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