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Re: Bubblesort - mcpaste

Re: Bubblesort

Von anonymous, 3 Jahre vorher, geschrieben in ARM Assembler, aufgerufen 782 mal. Dieser Paste ist eine Antwort auf Bubblesort von MC_J - zurück

URL https://mcpaste.de/view/a6157cb0/diff Einbetten

Unterschiede zwischen Bubblesort und Re: Bubblesort

# this subroutine bubble sorts vectors of words

#

# inputs

#   r0 - start of vector

#   r1 - number of elements to sort

#

# no outputs

#

# locals

#   r4 - current pointer

#   r5 - inner counter

#   r6 - keep_going flag

#   r7 - first element

#   r8 - second element

.equ datum_size,4

.globl _bubble

.text

_bubble:

        stmfd        sp!, {r4, r5, r6, r7, r8, lr}        @ save variables to stack

        cmp        r1, #1                                @ number of elements must be > 1

        ble        end_outer                        @ stop if nothing to do

        sub        r5, r1, #1                        @ need n-1 comparisons

        mov        r4, r0                                @ initialise current pointer

        mov        r6, #0                                @ this register set when we swap

loop_start:

        ldr        r7, [r4], #datum_size                @ load one element

        ldr        r8, [r4]                        @ and next one

        cmp        r7, r8                                @ compare them

        ble        no_swap                                @ branch if second greater

        mov        r6, #1                                @ set keep_going flag

        sub        r4, r4, #datum_size                @ reset pointer to first element

        swp        r8, r8, [r4]                        @ exchange value in r8 and address in r4

        str        r8, [r4, #datum_size]!                @ store new r8 to incremented address

no_swap:

        subs        r5, r5, #1                        @ decrement counter

        bne        loop_start                        @ and restart loop if more needed

end_inner:

        cmp        r6, #0                                @ check keep_going flag

        beq        end_outer                        @ and leave if not set

        mov        r6, #0                                @ clear keep_going flag 

        mov        r4, r0                                @ reset pointer

        sub     r5, r1, #1                        @ reset counter

        b        loop_start                        @ start another iteration

end_outer:

        ldmfd   sp!, {r4, r5, r6, r7, r8, pc}        @ restore state from stack and leave subroutimeU2FsdGVkX1/PS+f7Bee/UTfhcI3lnvDLZVmGy7rgKhvv8bGY4xlmooXVL1reypE5VqsZRC0edpgpZw5OyUg1oWvLzlcdJgekC35K

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Antwort auf "Re: Bubblesort"

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