OpenEuphoria

Re: if statement optimization

• Posted by mattlewis (admin) Oct 28, 2008
• 1032 views

if (condition) then 
    return 0 
else 
    return 1 
end if 

if (condition) then 
    return 0 
end if 
return 1 

As Jeremy showed, there is very little difference. The only real difference is that the second return ends up a little bit farther away (in memory) in the first case, which could possibly account for the minute difference that his test showed. Here is the IL for the two:

     1: 020 135 9                        # IF: [condition:135] = 0 goto 0009 
     4: 028 136 137                      # RETURNF: [LIT 0:137] 
     7: 023 12                           # ELSE goto 0012 
     9: 028 136 133                      # RETURNF: [LIT 1:133] 
 
    12: 020 135 18                       # IF: [condition:135] = 0 goto 0018 
    15: 028 136 137                      # RETURNF: [LIT 0:137] 
    18: 028 136 133                      # RETURNF: [LIT 1:133]