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Make the most of compiled C loops on the 68000

8 hours ago
https://dciabrin.net/posts/make-the-most-of-compiled-c-loops-on-the-68000/make-the-most-of-compiled-c-loops-on-the-68000/
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  • #retro
  • #68000
  • #optimization
  • The article discusses optimizing C loops for the 68000 processor, specifically for the Neo Geo hardware.
  • A simple clear_screen function in C is analyzed and optimized to generate efficient 68000 assembly.
  • The Neo Geo video hardware is described, highlighting its simplicity despite its advanced graphics capabilities.
  • Initial C implementation of clear_screen is shown, followed by assembly output with and without optimizations.
  • Compiler optimizations like constant folding and loop reversal are explained.
  • Attempts to hint the compiler for better register usage and loop optimization are detailed.
  • Final optimizations include using dbra instruction and tweaking compiler flags for better performance.
  • The conclusion emphasizes the balance between C and assembly for retro hardware development.
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