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The following c loop will not enable the gcc compiler for auto-vectorization
//gcc -O3 -fopt-info-vec-missed=loop_vect_v0.miss loop_vect_v0.c -o loop_vect_v0
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main() {
int array1[1000];
int array2[1000];
long array3[1000];
long arraySum = 0;
srand(time(NULL));
for (int i = 0; i < 1000; i++) {
array1[i] = (rand()% 2001) - 1000;
array2[i] = (rand()% 2001) - 1000;
array3[i] = array1[i] + array2[i];
arraySum += array3[i];
}
printf("The total array sum is: %li\n", arraySum);
return 0;
}
loop_vect_v0.c:14:1: note: not vectorized: loop contains function calls or data references that cannot be analyzed
loop_vect_v0.c:12:1: note: not vectorized: not enough data-refs in basic block.
loop_vect_v0.c:16:22: note: not vectorized: not enough data-refs in basic block.
loop_vect_v0.c:14:1: note: not vectorized: not enough data-refs in basic block.
loop_vect_v0.c:20:9: note: not vectorized: not enough data-refs in basic block.
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