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implement _cu_memcmp in ARMv7

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mykola2312 2022-05-21 07:20:14 +03:00
parent 3cca1f83ce
commit 13b40a44d3
2 changed files with 31 additions and 2 deletions
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29
arch/ARMv7.S
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@ -77,6 +77,35 @@ _cu_memmove:
bx lr
_cu_memcmp:
push {r4, r5}
mov r3, r2, lsr #2
tst r3, r3
beq .cmp1_
.cmp4:
ldr r4, [r0], #4
ldr r5, [r1], #4
cmp r4, r5
bne .cmpnot
subs r3, r3, #1
bne .cmp4
.cmp1_:
ands r3, r2, #3
beq .cmpok
.cmp1:
ldrb r4, [r0], #1
ldrb r5, [r1], #1
cmp r4, r5
bne .cmpnot
subs r3, r3, #1
bne .cmp1
.cmpok:
eor r0, r0, r0
pop {r4, r5}
bx lr
.cmpnot:
mov r0, #1
pop {r4, r5}
bx lr
_cu_memset:

4
test.c
View file

@ -162,7 +162,7 @@ int main()
printf("%x\t%x\n", 0x12345678, cu_bswap32(0x12345678));
printf("%lx\t%lx\n", 0x12345678abcd8765, cu_bswap64(0x12345678abcd8765));
printf("[struct]\n");
/*printf("[struct]\n");
printf("value_offset\t%u\n", value_offset(CU_STRUCT(test_s), 4, &test));
printf("value_size\t%u\n", value_size(CU_STRUCT(test_s), 4, &test));
uint64_t value;
@ -172,7 +172,7 @@ int main()
struct_size(CU_STRUCT(test_s), &test));
printf("value_offset\t%u\n", value_offset(CU_STRUCT(test_s), 5, &test));
printf("value_size\t%u\n", value_size(CU_STRUCT(test_s), 5, &test));
*/
char c0 = 0;
printf("cu_memset\tc0\t%p\n", cu_memtest(&c0, 1));