Example: Selection sorting (descending)
N EQU 10
FIR EQU 40H
SORT:
MOV A, #N;
DEC A
MOV R7, A; Number of outer loops
MOV A, #FIR
MOV R0, A; Array first address
NEXT0:
PUSH ACC; Save the address of the first byte of this round
MOV A, R7
MOV R6, A; Number of inner loops
MOV A, @R0; Take the first byte
NEXT1:
INC R0
MOV B, @R0
CJNE A, B, L1; Compare the first byte with another byte
SJMP L2
L1: JC L2; Greater than or equal to, do not exchange
XCH A, @R0; Less than, exchange
DJNZ R6, NEXT1; The smaller byte is in A, take the next byte to compare with it.
POP B ; one round of comparison ends
MOV R0, B ; restore the address of the first byte of this round
MOV @R0, A ; store the smallest number of this round in the first byte
INC R0 ; the byte address of the next round
MOV A, R0
DJNZ R7, NEXT0 ; next round
RET
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