The original point is that there is only one open implementation. This is a link to that one open implementation. You are pushing this conversation around in circles.
How many open implementations are there for plenty of other languages, like the main implementations, driving the whole ecosystem, not partial implementations with if and buts?
Only 1, additionally there are two competing ones based on GCC still WIP, and an alternative backend (Cranelift) without the capabilities LLVM can offer in performance.