Specifies that a particular loop should never be vectorized.


#pragma novector




The novector pragma specifies that a particular loop should never be vectorized, even if it is legal to do so. When avoiding vectorization of a loop is desirable (when vectorization results in a performance regression rather than improvement), the novector pragma can be used in the source text to disable vectorization of a loop. This behavior is in contrast to the vector always pragma.

Example: Using the novector pragma

void foo(int lb, int ub) {
  #pragma novector
  for(j=lb; j<ub; j++) { a[j]=a[j]+b[j]; } 

When the trip count (ub - lb) is too low to make vectorization worthwhile, you can use the novector pragma to tell the compiler not to vectorize, even if the loop is considered vectorizable.

Para obtener información más completa sobre las optimizaciones del compilador, consulte nuestro Aviso de optimización.