Enable non-temporal store using !DIR$ vector nontemporal. The nontemporal clause directs the compiler to use non-temporal (that is, streaming) stores, optionally takes a comma-separated list of variables.

Streaming stores may cause significant performance improvements over non-streaming stores for large numbers on certain processors. However, the misuse of streaming stores can significantly degrade performance.

!DIR$ vector nontemporal
do i=1,N
  arr1(i) = 0
end do

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• VECTOR and NOVECTOR
• Vectorization Resources for Intel® Advisor Users