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ASCENDING AND DESCENDING SORT

 ;Program to arrange series of 32bit numbers in ascending or descending order
 AREA data1,data,readonly
 DCD 0x12,0x13,0x18,0x674
 AREA data2,data
 SPACE 4
 AREA prog,code,readonly
 ENTRY
 mov r3,#4
 ldr r0,=data1
 ldr r1,=data2
top ldr r2,[r0],#4
 str r2,[r1],#4
 subs r3,#1
 bne top
 mov r5,#3
olop ldr r0,=data2
 mov r6,r5
up ldr r1,[r0],#4
 ldr r2,[r0]
 cmp r1,r2
 bcc skp ;replace bcc with bhi for descending sorting
 str r1,[r0],#-4
 str r2,[r0],#4
skp subs r6,#1
 bne up
 subs r5,#1
 bne olop
s b s
 END

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