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.text
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.text
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.global memcpy
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.global memcpy
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memcpy:
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memcpy:
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 - 
 
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add     r3, r1, #3
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	add     r3, r1, #3
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bic     r3, r3, #3
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	bic     r3, r3, #3
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cmp     r1, r3
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	cmp     r1, r3
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stmdb   sp!, {r4, lr}
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	stmdb   sp!, {r4, lr}
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beq     case_4
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	beq     case_4