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41 lines
548 B
C
41 lines
548 B
C
3 years ago
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#include <stdio.h>
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#include <stdint.h>
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int main() {
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//uint64_t c = 5;
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uint64_t b, c = 5;
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int64_t *a;
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int64_t array[] = {1, 2, 3, 4, 5};
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a = array;
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//printf("pointer: %p\n", a);
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asm (
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"mov %1, %%rax\n"
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"mov %2, %%rcx\n"
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"xor %%rbx, %%rbx\n"
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"cmp $0, %%rcx\n"
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"je end\n"
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"dec %%rcx\n"
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"loop:\n"
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"lea (%%rax, %%rcx, 8), %%rdx\n"
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"add (%%rdx), %%rbx\n"
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"dec %%rcx\n"
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"cmp $-1, %%rcx\n"
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"je end\n"
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"jmp loop\n"
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"end:\n"
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"mov %%rbx, %0\n"
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: "=r" (b)
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: "r" (a), "r" (c)
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);
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printf("%lld\n", b);
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}
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