Diagnostic 15344: loop was not vectorized: vector dependence prevents vectorizationxxxx

Cause:

This vectorization diagnostic is emitted starting from Intel(R) C++ Compiler 15.0. This diagnostic message is emitted when the compiler detects or assumes a vector dependence in the loop body. Only the first dependence information is displayed when using -qopt-report2 compiler option (level 2 report). More detailed information on the vector dependence can be generated by using the compiler option -qopt-report5 (on Linux) or /Qopt-report5​ (on Windows).

Examples:

int foo(float *A, int n){
  int inx = 0;
  float max = A[0];
  int i;
  for (i=0;i<n;i++){
    if (max>A[i]){
      max = A[i];
      inx = i*i;
    }
  }
  return inx;
}