$ corelist -a if

if was first released with perl 5.006002
  5.006002   0.03      
  5.007003   0.01      
  5.008      0.01      
  5.008001   0.03      
  5.008002   0.03      
  5.008003   0.03      
  5.008004   0.03      
  5.008005   0.03      
  5.008006   0.03      
  5.008007   0.03      
  5.008008   0.05      
  5.009      0.03      
  5.009001   0.0401    
  5.009002   0.0401    
  5.009003   0.05      
  5.009004   0.05      
  5.009005   0.05