$ cat 645310.pl
use strict;
use warnings;
use Benchmark qw/ cmpthese /;

our $verbosity = 7;
our $volume    = 1;
use constant VERBOSE => 0;

cmpthese(
  -1,
  {
    'Name7' => ' if ( $volume >= $verbosity ) { v_print3( "foo" ) }; ',
    'Name8' => ' if ( VERBOSE )               { v_print3( "foo" ) }; ',
  }
);

sub v_print3 { my $message = shift; print $message; }
__END__
$ perl 645310.pl
            Rate Name7 Name8
Name7  9442579/s    --  -74%
Name8 35826879/s  279%    --