Sorting

Methods : Sort

Sorting a list of numbers.

See also:

/techref/microchip/math/medfilsort-mc.htm a routine to sort a list of 16 bits values.
../microchip/compcon.htm 16 bit comparison code.
Address Calculation: the forgotten sort
http://c2.com/cgi/wiki?SortingAlgorithms for a whole slew of more-or-less complicated sorting algorithms.

A simple bubble sort for 8 bit values:


; 4 element bubble sort routine
; by Andrew Warren <aiw at cypress.com> on 2001-04-13
; 2001-06-19:DAV: reworded comments.
  ; Macro ``Order'' puts the values in registers X and Y
  ; in order (X <= Y) by swapping their values (if necessary).
ORDER   MACRO   X,Y
        local endif
        ;if( Y < X)...
        MOVFW    X
        SUBWF   Y,W ; compare and set W := (Y-X). (modulo 0xff).
        BC endif
        ;...then swap them.
        ADDWF   X,f               ; Xnew := X + (Y-X) = Y;
        SUBWF   Y,f               ; Ynew := Y - (Y-X) = X;
endif:
        ; now X <= Y.
        ENDM

; SUBROUTINE SORTSUB() SORTS REG1-REG4 IN ASCENDING ORDER.
        SORTSUB:
                CALL    SORT3
                CALL    SORT2
        SORT1:  ORDER   REG1,REG2
        SORT2:  ORDER   REG2,REG3
        SORT3:  ORDER   REG3,REG4
                RETURN
; SORTSUB requires 21 words of code.
; by Andrew Warren

The "order" macro sorts 2 numbers (8 bit values).

file: /techref/method/sorts.htm, 1KB, , updated: 2003/11/30 20:31, local time: 2008/10/11 19:40, owner: DAV-MP-E62a,

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