SXp precompiler:

Higher programming language or assembly code? Because of market developments and ever-shortening design cycles, today’s software developers tend to employ higher programming languages like C or C+ for microcontroller applications. In many cases, this choice is more or less forced by requirements like program documentation, product support and deadlines. However, higher-level programming may not be possible when memory resources are limited, or when the application is time-critical. In such cases, an assembler supporting structured programming offers the best of both worlds, with high program speeds and clever memory usage thrown in as useful extras.