Get rid of a scope, use preinc instead of postinc.
sub ikegami {
my %wordcount;
++$wordcount{$_} for split ' ', $line;
}
Rate loop with vars with map loop sans vars ikegami
loop with vars 8324/s -- -19% -20% -22%
with map 10241/s 23% -- -1% -4%
loop sans vars 10370/s 25% 1% -- -3%
ikegami 10666/s 28% 4% 3% --
(Post-increment in void context is optimised to pre-increment, but it's not in void context in "with map".)
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