Hello
I'm confused with the benchmark by Edward. The XOR code seems to be 3 times faster than the 'mine' using the following benchmark (shouldn't benchmark code always be published?)
#!/usr/bin/perl -w
use strict;
my $s1 = 'AAAAA';
my $s2 = 'ATCAA';
for (my $i=0;$i<600000;$i++){
#choose one of the two methods
#hd($s1,$s2); # real 0m1.401s
hd2($s1,$s2); # real 0m0.405s
}
sub hd{
my ($k,$l) = @_;
my $len = length ($k);
my $num_mismatch = 0;
for (my $i=0; $i<$len; $i++)
{
++$num_mismatch if substr($k, $i, 1) ne substr($l, $i, 1);
}
return $num_mismatch;
}
sub hd2 {
return ($_[0] ^ $_[1]) =~ tr/\001-\255//;
}
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