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IF, CASE, EXECUTE... Which 's Faster????

General Coding

IF, CASE, EXECUTE... Which 's Faster????

by  Gaudalier  Posted    (Edited  )
Evolution: the meaning of 4 and 5 GL. But a High Level Programming Lenguaje NEVER will be as FAST and SMALL as ASSEMBLER Lenguaje, by many reasons. So We are Clarion Programmers: a 4 GL (Dunno if still being 3 GL) we are not responsable for the Optimization of ASSEMBLER code that finally generate Clarion in the Exe's, but for the way we use the High Lenguaje instructions.

So I make some Testing in find the Faster instruccion in CONDITIONAL STATEMENT EXECUTION ESTRUCTURES: [color red]IF, CASE, EXECUTE, CHOOSE, INLIST.[/red] These are all That I know by now.

The BenchMark is base on a 10 Options to look for (All falses), and finally select an 11 Option when there's no matching values. All inclosed in a [/b] [color red]10,000,000[/red][/b] Times LOOP

Here the code:
[/b][color red]IF ESTATEMENT[/red][/b]
Code: 
CheckinTime#  = CLOCK()
TRUELIES#     = 69
LOOP 10000000 TIMES
  IF    TRUELIES# = 1
    TRUELIES# = 1
  ELSIF TRUELIES# = 2
    TRUELIES# = 1
  ELSIF TRUELIES# = 3
    TRUELIES# = 1
  ELSIF TRUELIES# = 4
    TRUELIES# = 1
  ELSIF TRUELIES# = 5
  TRUELIES# = 1
  ELSIF TRUELIES# = 6
  TRUELIES# = 1
  ELSIF TRUELIES# = 7
  TRUELIES# = 1
  ELSIF TRUELIES# = 8
  TRUELIES# = 1
  ELSIF TRUELIES# = 9
  TRUELIES# = 1
  ELSIF TRUELIES# = 10
  TRUELIES# = 1
  ELSE
    TRUELIES# = 96
  END
END
MESSAGE('Holding: ' & CLOCK()-CheckinTime# & ' Cent/Second','First Down  !!!!!')

[/b][color red]CASE ESTATEMENT[/red][/b]
Code: 
CheckinTime#  = CLOCK()
TRUELIES#     = 69
LOOP 10000000 TIMES
  CASE  TRUELIES#
    OF  1
    TRUELIES# = 1
    OF  2
    TRUELIES# = 2
    OF  3
    TRUELIES# = 3
    OF  4
    TRUELIES# = 4
    OF  5
    TRUELIES# = 5
    OF  6
    TRUELIES# = 6
    OF  7
    TRUELIES# = 7
    OF  8
    TRUELIES# = 8
    OF  9
    TRUELIES# = 9
    OF  10
    TRUELIES# = 10
  ELSE
    TRUELIES# = 96
  END
END
MESSAGE('Holding: ' & CLOCK()-CheckinTime# & ' Cent/Second','First Down  !!!!!')

[/b][color red]EXECUTE ESTATEMENT[/red][/b]
Code: 
CheckinTime#  = CLOCK()
TRUELIES#     = 69
LOOP 10000000 TIMES
  EXECUTE TRUELIES#
    TRUELIES# = 1
    TRUELIES# = 2
    TRUELIES# = 3
    TRUELIES# = 4
    TRUELIES# = 5
    TRUELIES# = 6
    TRUELIES# = 7
    TRUELIES# = 8
    TRUELIES# = 9
    TRUELIES# = 10
  ELSE
    TRUELIES# = 96
  END
END
MESSAGE('Holding: ' & CLOCK()-CheckinTime# & ' Cent/Second','First Down  !!!!!')

[/b][color red]CHOOSE ESTATEMENT[/red][/b]
Code: 
CheckinTime#  = CLOCK()
TRUELIES#     = 69
LOOP 10000000 TIMES
  TRUELIES# = CHOOSE(TRUELIES#,1,2,3,4,5,6,7,8,9,10,96)
END
MESSAGE('Holding: ' & CLOCK()-CheckinTime# & ' Cent/Second','First Down  !!!!!')

[/b][color red]INLIST ESTATEMENT[/red][/b]
Code: 
CheckinTime#  = CLOCK()
TRUELIES#     = 69
LOOP 10000000 TIMES
  TRUELIES# = INLIST(TRUELIES#,'1','2','3','4','5','6','7','8','9','10')
  IF TRUELIES# = FALSE
    TRUELIES# = 96
  END
END
MESSAGE('Holding: ' & CLOCK()-CheckinTime# & ' Cent/Second','First Down  !!!!!')

[color red]STATS:[/color]
Time is in Hundredths of a Sec. Test was made in a Pentium III, 256 RAM & NT 4.0 WorkStation SP 6a, Using C55f ABC. (**** The Small, the Better ****)

[color blue]IF STATEMENT:[/color][color red] -> 35[/color]
[color blue]CASE STATEMENT:[/color][color red] -> 33[/color]
[color blue]EXECUTE STATEMENT:[/color][color red] -> 36[/color]
[color blue]CHOOSE STATEMENT:[/color][color red] -> 8[/color]
[color blue]INLIST STATEMENT:[/color][color red] -> 1619 [/color]

[color red]CONCLUTION:[/color]

Well, at least you're programming a FAST requiring App. like Images and Data process, the Time you save by choosing the CHOOSE statement is not trascendental matters. Finnally the way your [color red]CODE LOOKS LIKE[/color] is order to be the easiest understanding by others or to be corrected by yourself after a long time periods, is the Conditional Statement that MUST TO BE CHOOSEN.


Bye


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