Code A

MOV r0,#256

LDRB r1,Table

Loop LDRB r2,[r1] ;load a byte

LSLB r2,r2,#2 ;multiply if by 4

ADDB r2,r2,#1 ;add 1

STRB r2,[r1] ;store it

ADDB r1,r1,#1 ;increment the pointer

SUBS r0,r0,#1 ;subtract 1 from the loop count

BNE Loop ;repeat

Code B

MOV r0,#64

LDR r1,Table

Loop PLDRB r2,[r1] ;parallel load 4 bytes

PADDAB r2,#1 ;parallel add 1 to each byte

PLSLB r2,#2 ;parallel shift 4 bytes

STRB r2,[r1,#1]! ;store it

COUNT r0,Loop

Explain each line of this code