Table 5 Advantages and drawbacks of various compiler optimisation levels
From: An efficient permutation approach for SbPN-based symmetric block ciphers
Compiler optimization level | Advantages | Drawbacks |
|---|---|---|
-O0 | High correlational view between source and generated codes Quick build and compile Easy Debugging Best for prototyping | No Optimisations enabled Large Code-size Higher execution-time |
-O1 | Better debug view Good stack utilisation | High Memory Requirements High Execution-time |
-O2 | High Speed | Larger Code-size |
-O3 | High Speed | Larger Code-size Poor correlational view between source and generated codes |
-Ofast | High Speed | Larger Code-size Poor correlational view between source and generated codes May perform optimisations that are not standard compliant |
-Oz | Reduced Memory Footprint | Slower execution |
-Os | Balanced speed and memory usage | Moderate performance |