Category
@PROCESS
None.
Purpose
Provides object files with information that the IBM Feedback Directed Program Restructuring (FDPR®) performance-tuning utility needs to optimize the resulting executable file.
When -qfdpr is in effect, optimization data is stored in the object file.
Defaults
-qnofdpr
Usage
For best results, use -qfdpr for all object files in a program; FDPR will perform optimizations only on the files compiled with -qfdpr, and not library code, even if it is statically linked.
The optimizations that the FDPR utility performs are similar to those that the -qpdf option performs.
The FDPR performance-tuning utility has its own set of restrictions, and it is not guaranteed to speed up all programs or produce executables that produce exactly the same results as the original programs.
Examples
xlf myprogram.f -qfdpr