Optimization and tuning compatibility

IBM Open XL C/C++ for AIX 17.1.3 has different optimization technology from IBM® XL C/C++ for AIX® 16.1.0 and earlier releases.

When you migrate programs from IBM XL C/C++ for AIX 16.1.0 or earlier releases to IBM Open XL C/C++ for AIX 17.1.3, specify LLVM options to utilize LLVM optimization features.