Ok, using BrowserUk's suggestions we improved the speed by 25.5 percent.
I am not a perl whiz, and do not know how to "remove a level of scope" in the syntax below.
"use integer" helps, and more so (i think) when I moved it outside of the loop.
the "grep $_ &1, @LongListOfIntegers" doesn't do anything since I know the values are all odd.
The last idea provided the most savings. I do need both values as keys in the hash, since I am using this as a lookup in subsequent steps.
{
use integer;
foreach my $i1 ( 0 .. $#LongListOfIntegers) {
my $v = $LongListOfIntegers[ $i1 ];
foreach (@LongListOfIntegers[ $i1+1 .. $#LongListOfIntegers]) {
if (($v & $_) == 1) {
$MatchedIntegers{$v}{$_}=();
$MatchedIntegers{$_}{$v}=();
}
}
}
}
Thanks. Now I am going to investigate kikuchiyo's comments.
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