Diagnostic 15524: xxxx was not vectorized: search loop cannot be vectorized unless all memory references can be aligned vector load

Cause:

This vectorization diagnostic is emitted starting from Intel(R) C++ Compiler 15.0. Search loop vectorization depends on the following heuristic: If a "vector load" fits entirely within a cache line, and if such a vector load has one non-speculatively accessed element, it is safe for the compiler to speculatively load all other elements (within the same cache line) in such a vector load. 

Examples:

int foo(float *a, int n){
  int i;
  for (i=0;i<n;i++){
    if (a[2*i] == 0){
      break;
    }
  }
  return i;
}