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Re^4: Faster Luhn Check Digit Calculation?

by BrowserUk (Patriarch)
on Dec 01, 2018 at 02:54 UTC ( #1226582=note: print w/replies, xml ) Need Help??


in reply to Re^3: Faster Luhn Check Digit Calculation?
in thread Faster Luhn Check Digit Calculation?

Some micro-ops yeild a further 40%:

sub luhn { use integer; my $s = $_[ 0 ]; my $total = 0; for my $i ( 0 .. 14 ) { my $d = substr( $s, $i, 1 ); unless( $i & 1 ) { $d *= 2; $d -= 9 if $d > 9; } $total += $d; } $total *= 9; return chop $total; }

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
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