> Is there a JITing C compiler, or something like that? Yes, for example, compiling C to JavaScript (or asm.js, etc. [0]) leads to the C code being JITed. And

> Is there a JITing C compiler, or something like that? Yes, for example, compiling C to JavaScript (or asm.js, etc. [0]) leads to the C code being JITed. And yes, there are definitely benchmarks where this is actually faster. Any time that a typical C compiler can't see that inlining makes sense is such an opportunity, as the JIT compiler sees the runtime behavior. The speedup can be very large. However, in practice, most codebases get inlined well using clang/gcc/etc., leaving few such opportunities. [0] This may also happen when compiling C to WebAssembly, but it depends on whether the wasm runtime does JIT optimizations - many do not and instead focus on static optimizations, for simplicity.