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6502 C compiler performance

Oric-1 compiler benchmark (Source)
- Tested compilers: cc65, gcc-6502, KickC, lcc65, llvm-mos, sdcc, vbcc.
- This is the most comprehensive one. Focuses on typical benchmark samples.
- They appear to use -O2 as the size optimization flag for llvm-mos, which is odd - -Os gives much better results.
sgadrat's Super Tilt Bro benchmark (([https://github.com/sgadrat/6502-compilers-bench|Source]])
- Tested compilers: cc65, gcc-6502, KickC, llvm-mos (via pull request), vbcc.
- Seems to mostly be based on real-world/tutorial cc65 code snippets. Some have optimized ASM to compare against.
NESFab benchmark (Could not locate source.)
- Tested compilers: cc65, gcc-6502, KickC, llvm-mos, vbcc.
- No methodology; in addition, NESFab is more akin to a high-level assembler than a C compiler.