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#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <immintrin.h>
#define INPUT_LEN 200
#define SEARCH 2020
int inner_repair_avx(int i, const int *arr, __m256i search)
{
__m256i start = _mm256_set1_epi32(i);
for (int k = 0; k < INPUT_LEN; k += 8) {
__m256i new = _mm256_loadu_si256((__m256i *)(&arr[k]));
new = _mm256_add_epi32(start, new);
int mask = _mm256_movemask_epi8(_mm256_cmpeq_epi32(new, search));
if (mask == 0) {
continue;
}
for (int l = 0; l < 8; l++) {
if (mask & (0xf << (l * 4))) {
return arr[k + l];
}
}
}
return 0;
}
int repair_avx(const int *arr)
{
__m256i search = _mm256_set1_epi32(SEARCH);
for (int i = 0; i < INPUT_LEN; i++) {
__m256i start = _mm256_set1_epi32(arr[i]);
for (int j = 0; j < INPUT_LEN; j += 8) {
__m256i new = _mm256_loadu_si256((__m256i *)(&arr[j]));
new = _mm256_add_epi32(start, new);
int mask = _mm256_movemask_epi8(_mm256_cmpgt_epi32(new, search));
if (mask == 0xffffffff) {
continue;
}
switch (__lzcnt32(mask) / 4) {
case 0: goto label0;
case 1: goto label1;
case 2: goto label2;
case 3: goto label3;
case 4: goto label4;
case 5: goto label5;
case 6: goto label6;
case 7: goto label7;
}
label0:
if ((mask & 0x0000000f) == 0) {
int tmp = inner_repair_avx(_mm256_extract_epi32(new, 0), arr, search);
if (tmp) {
return tmp * arr[i] * arr[j];
}
}
label1:
if ((mask & 0x000000f0) == 0) {
int tmp = inner_repair_avx(_mm256_extract_epi32(new, 1), arr, search);
if (tmp) {
return tmp * arr[i] * arr[j + 1];
}
}
label2:
if ((mask & 0x00000f00) == 0) {
int tmp = inner_repair_avx(_mm256_extract_epi32(new, 2), arr, search);
if (tmp) {
return tmp * arr[i] * arr[j + 2];
}
}
label3:
if ((mask & 0x0000f000) == 0) {
int tmp = inner_repair_avx(_mm256_extract_epi32(new, 3), arr, search);
if (tmp) {
return tmp * arr[i] * arr[j + 3];
}
}
label4:
if ((mask & 0x000f0000) == 0) {
int tmp = inner_repair_avx(_mm256_extract_epi32(new, 4), arr, search);
if (tmp) {
return tmp * arr[i] * arr[j + 4];
}
}
label5:
if ((mask & 0x00f00000) == 0 ){
int tmp = inner_repair_avx(_mm256_extract_epi32(new, 5), arr, search);
if (tmp) {
return tmp * arr[i] * arr[j + 5];
}
}
label6:
if ((mask & 0x0f000000) == 0) {
int tmp = inner_repair_avx(_mm256_extract_epi32(new, 6), arr, search);
if (tmp) {
return tmp * arr[i] * arr[j + 6];
}
}
label7:
if ((mask & 0xf0000000) == 0) {
int tmp = inner_repair_avx(_mm256_extract_epi32(new, 7), arr, search);
if (tmp) {
return tmp * arr[i] * arr[j + 7];
}
}
}
}
return 0;
}
int main(int argc, char *argv[])
{
FILE *file = fopen(argv[argc - 1], "r");
if (!file) {
return 1;
}
char buffer[8] = { 0 };
int input[INPUT_LEN] = { 0 };
for (int i = 0; i < 200; i++) {
fgets(buffer, 8, file);
input[i] = atoi(buffer);
}
fclose(file);
printf("%i\n", repair_avx(input));
}
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