-qpdf1, -qpdf2, -qshowpdf

In IBM® XL C/C++ for AIX® 16.1.0 or earlier releases, the -qpdf1, -qpdf2, and -qshowpdf options tune optimizations through profile-directed feedback (PDF).

IBM Open XL C/C++ for AIX 17.1.3 no longer support the PDF feature. Profile-guided optimization (PGO) is a replacement, which is a compiler optimization technique that uses profiling to improve program runtime performance. For details, see Profile Guided Optimization (PGO).