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finalConfig.s
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finalConfig.s
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@ finalConfig.s
@ This function checks whether any of the piles have no cards left and
@ condenses the array accordingly so all piles are in contiguous memory addresses
.cpu cortex-a53
.fpu neon-fp-armv8
.data
.text
.align 2
.global finalConfig
.syntax unified
.type finalConfig, %function
finalConfig:
push {fp, lr} @ Pushes fp and lr onto the stack
add fp, sp, #4 @ Adds 4 to sp and stores it in fp
ldr r6, [r9] @ Loads the number of card piles into r6
cmp r6, #9 @ Compares the value in r6 to 9
bne nextRound @ If they are not equal, leave sentinel value as is
mov r0, #0 @ Moves #0 into r0
mov r2, #9 @ Moves #9 into r2
mov r7, #8 @ Moves #8 into r7
loop1:
sub r2, r6, r7 @ Subtracts value in r7 from r6 and stores it in r2
mov r1, r0, LSL #2 @ Moves address location offset into r1
ldr r4, [r10, r1] @ Loads value in array into r4
loop2:
cmp r2, #9 @ Compares r2 to #9
bge exitLoop2 @ If r2 is greater than or equal to 9, exit secondary loop
mov r3, r2, LSL #2 @ Moves address location offset into r3
ldr r5, [r10, r3] @ Loads second value in array into r5
cmp r4, r5 @ Compares the two values
beq nextRound @ If they're equal, moves on to the next round
add r2, r2, #1 @ Increments r2 by 1
bl loop2 @ Returns to start of secondary loop
exitLoop2:
add r0, r0, #1 @ Increments r0 by 1
sub r7, r7, #1 @ Decrements r7 by 1
cmp r0, #9 @ Compares the value in r0 to #9
bge finalConfigFound @ If r0 is greater than or equal to #9, exit loop and set sentinel value
bl loop1 @ Returns to the start of the primary loop
finalConfigFound:
mov r8, #1 @ Changes sentinel value to exit the loop in main.s
nextRound:
sub sp, fp, #4 @ Moves down one memory location from fp and stores it in sp
pop {fp, pc} @ Pops fp and pc from the stack