IBM Compiler Optimization Flags

The most important IBM compiler optimization flags are described, both their good features and their drawbacks. Recommendations are made as to which flags should be in which situations.

• Introduction
• -On
• -qstrict
• -qhot
• -qipa
• -qarch
• -qtune
• -qcache
• -lessl
• -qessl
• -qsmp
• Examples
• References

See also:

• Bassi Compiler Optimization Arguments (PDF)