I checked using godbolt, and when compiling with -O2 (like his makefile) only the parse_chunk_pp version is in the emitted assembly and is called regardless of

I checked using godbolt, and when compiling with -O2 (like his makefile) only the parse_chunk_pp version is in the emitted assembly and is called regardless of the -P option. I think compilers have done this where applicable for a long time. Compiling without any arguments leads to two lines differing in the assembly for the functions.