Forth83 Benchmarks#

Below is a collection of some Benchmarks for Forth83 systems like VolksForth.

I found most of these benchmarks on comp.lang.forth, Hans Bzemers 4th and Marcel Hendrix benchmark collection

Integer Calculations #

32000 constant intMax

variable intResult

: DoInt
  1 dup intResult dup >r !
  begin
    dup intMax <
  while
    dup negate r@ +! 1+
    dup r@ +! 1+
    r@ @ over * r@ ! 1+
    r@ @ over / r@ ! 1+
  repeat
  r> drop drop
;

Fibonacci 1#

: fib1 ( n1 -- n2 )
    dup 2 < if drop 1 exit then
    dup  1- recursive 
    swap 2- recursive  + ;

Fibonacci 2#

: fib2 ( n1 -- n2 )                                                                
   dup 2 < if drop 1 else                                                           
   dup  1- recursive                                                                
   swap 2 - recursive +                                                             
 then ;   

Forth Nesting Benchmark#

 \ Forth nesting (NEXT) Benchmark                     cas20101204                   
 : bottom ;                                                                         
 : 1st bottom bottom ;  : 2nd 1st 1st ;      : 3rd 2nd 2nd ;                        
 : 4th 3rd 3rd ;        : 5th 4th 4th ;      : 6th 5th 5th ;                        
 : 7th 6th 6th ;        : 8th 7th 7th ;      : 9th 8th 8th ;                        
 : 10th 9th 9th ;       : 11th 10th 10th ;   : 12th 11th 11th ;                     
 : 13th 12th 12th ;     : 14th 13th 13th ;   : 15th 14th 14th ;                     
 : 16th 15th 15th ;     : 17th 16th 16th ;   : 18th 17th 17th ;                     
 : 19th 18th 18th ;     : 20th 19th 19th ;   : 21th 20th 20th ;                     
 : 22th 21th 21th ;     : 23th 22th 22th ;   : 24th 23th 23th ;                     
 : 25th 24th 24th ;                                                                 
                                                                                    
 : 32million   CR ." 32 million nest/unnest operations" 25th ;                      
 :  1million   CR ."  1 million nest/unnest operations" 20th ;                      
                                                                                    
 CR .( enter 1million or 32million )         

Forth Memory Move Benchmark#

\ Forth Memory Move Benchmark                       cas 20101204                   
  8192 CONSTANT bufsize                                                             
 VARIABLE buf1 HERE bufsize 1+ allot BUF1 !                                         
 VARIABLE buf2 HERE bufsize 1+ allot BUF2 !                                         
                                                                                    
 : test-CMOVE 49 0 DO BUF1 @ BUF2 @ bufsize CMOVE LOOP ;                            
                                                                                    
 : test-CMOVE> 49 0 DO BUF2 @ BUF1 @ bufsize CMOVE> LOOP ;                          
                                                                                    
 : test-MOVE> 49 0 DO BUF1 @ BUF2 @ bufsize MOVE LOOP ;                             
                                                                                    
 : test-<MOVE 49 0 DO BUF2 @ BUF1 @ bufsize MOVE LOOP ;     

count bits in byte#

 \ Forth Benchmark - count bits in byte              cas 20101204
 
 VARIABLE cnt
 
 : countbits ( uu -- #bits )
   cnt off
   8 0 DO dup $01010101  and cnt +!
          2/
   LOOP drop
   0 cnt 4 bounds DO i C@ + LOOP ;
 
 : bench5
   8192 DO I countbits . LOOP ;

Sieve Benchmark#

\ Sieve Benchmark -- the classic Forth benchmark    cas 20101204                   
                                                                                    
 8192 CONSTANT SIZE   VARIABLE FLAGS  0 FLAGS !  SIZE ALLOT                         
                                                                                    
 : DO-PRIME                                                                         
   FLAGS SIZE 1 FILL  ( set array )                                                 
   0 ( 0 COUNT ) SIZE 0                                                             
   DO FLAGS I + C@                                                                  
     IF I DUP + 3 + DUP I +                                                         
        BEGIN DUP SIZE <                                                            
        WHILE 0   OVER FLAGS +  C!  OVER +  REPEAT                                  
        DROP DROP 1+                                                                
     THEN                                                                           
 LOOP                                                                               
 . ." Primes" CR ;