New release

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

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+---
+layout: post
+title: Released Cyclone Scheme 0.9.4
+excerpt: 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).
+