用arm写,谢谢

发布网友发布时间：2024-10-09 04:37

共1个回答

热心网友时间：2024-11-16 13:54

.global

.text
.equ num,20

_start:
ADR r0, src /*将str地址送给R0*/
ADR r3, src1
ADR r4, src2
ADR r5, src3
ADR r6, src4
MOV r2, #num

change:
LDRB r7, [r0], #1

CMPS r7,#0x30 /*比0小?*/
BLT l3
CMPS r7,#0x39 /*比9大?*/
BGT l1
STRB r7, [r3], #1
B pe

l1: CMPS r7,#0x41 /*比A小?*/
BLT l3
CMPS r7,#0x5a /*比Z大?*/
BGT l2
STRB r7, [r4], #1
B pe

l2: CMPS r7,#0x61 /*比a小?*/
BLT l3
CMPS r7,#0x7a /*比z大?*/
BGT l3
STRB r7, [r5], #1
B pe

l3: STRB r7, [r6], #1

pe: SUBS r2, r2, #1
CMPS r2,#0
BNE change

stop:
B stop

.ltorg

src:
.string "7Wdhd@y3#jfsdaGJd7Bh\n"
src1:
.string "00000000000000000000\n"
src2:
.string "00000000000000000000\n"
src3:
.string "00000000000000000000\n"
src4:
.string "00000000000000000000\n"

.end

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