common-lisp Customization Optimization settings
Example
Common Lisp has a way to influence the compilation strategies. It makes sense to define your preferred values.
Optimization values are between 0 (unimportant) and 3 (extremely important). 1 is the neutral value.
It's useful to always use safe code (safety = 3) with all runtime checks enabled.
Note that the interpretation of values is implementation specific. Most Common Lisp implementations make some use of these values.
| Setting | Explanation | useful default value | useful delivery value |
|---|---|---|---|
compilation-speed | speed of the compilation process | 2 | 0 |
debug | ease of debugging | 2 | 1 or 0 |
safety | run-time error checking | 3 | 2 |
space | both code size and run-time space | 2 | 2 |
speed | speed of the object code | 2 | 3 |
An optimize declaration for use with declaim, declare and proclaim:
(optimize (compilation-speed 2)
(debug 2)
(safety 3)
(space 2)
(speed 2))
Note that you can also apply special optimization settings to portions of the code in a function using the macro LOCALLY.
