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comparison target-utils/libc/memcmp.S @ 93:a675cec34076

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target-utils/libc: assembly implementation of bcmp/memcmp
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 29 Oct 2016 00:15:12 +0000
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92:bfed7a5c21a6 93:a675cec34076
1 .text
2 .code 32
3 .globl bcmp
4 .globl memcmp
5 bcmp:
6 memcmp:
7 cmp r2, #0
8 beq zero_len_out
9 mov r3, r0
10 1: ldrb r0, [r3], #1
11 ldrb r12, [r1], #1
12 subs r0, r0, r12
13 bxne lr
14 subs r2, r2, #1
15 bne 1b
16 bx lr
17
18 zero_len_out:
19 mov r0, #0
20 bx lr