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use Inline C => 'DATA';
use Benchmark 'cmpthese';
...
  double prod = x_sq * y_sq;
  return sqrt(prod);
}

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$ ./mytest.pl
           Rate vdiag ediag cdiag
vdiag 1589859/s    --  -49%  -82%
ediag 3127854/s   97%    --  -64%
cdiag 8603134/s  441%  175%    --