cyclone/_posts/2018-11-25-Released-Cyclone-Scheme-0.9.4.md

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post	Released Cyclone Scheme 0.9.4	This release includes many new compiler optimizations.

Compiler Optimizations

• Optimize recursive functions by expressing the recursive calls using C iteration. This optimization is more effective when combined with the others listed below as they collectively increase the chances that a higher-level Scheme loop may be compiled down to a single C function. These C functions can then be "called" repeatedly using a while loop which is more efficient at a low level than repeated function calls.
• Combine lambda functions that are only called for side effects.
• Improve inlining of primitives that work with immutable objects.
• Eliminate functions that are only used to define local variables.

Features

• Added a new feature program to cond-expand that is only defined when compiling a program. This allows, for example, a .scm file to contain a section of code that can be used to run unit tests when the file is compiled as a program. The same file can then be used in production to import code into a library. This is similar to using the __main__ scope in a python program.

Bug Fixes

• Prevent GC segmentation fault on ARM platforms (Raspberry Pi 2).