Some of that capability is there only to overcome optimization problems that were created by C++ features. You don't need to make the compiler aware that some v

Some of that capability is there only to overcome optimization problems that were created by C++ features. You don't need to make the compiler aware that some values are "going away" soon if that is clearly obvious. Without layer upon layer of object obfuscation, optimization is a much easier problem. In C too, functions are removed entirely in favor of the results. This is a quality-of-implementation issue. There are good and bad compilers for most languages. C is less dependent on compiler quality however, with relatively simple compilers being able to produce good output for stylistically typical code.