Here's a benchmark of all modern 6502 C compilers: https://thred.github.io/c-bench-64/ https://thred.github.io/c-bench-64/ - do note that binary sizes also incl

Here's a benchmark of all modern 6502 C compilers: https://thred.github.io/c-bench-64/ https://thred.github.io/c-bench-64/ - do note that binary sizes also include the size of the standard libraries, which means it is not a full picture of the code generation density of the compilers themselves.