None.
None.
Informs the compiler that a given compilation unit may reference write-through-enabled or cache-inhibited storage.
-qnodirectstorage
Use this option with discretion. It is intended for programmers who know how the memory and cache blocks work, and how to tune their applications for optimal performance. For a program to execute correctly on all Power® implementations of cache organization, the programmer should assume that separate instruction and data caches exist, and should program to the separate cache model.