>>9
Not really, it's impossible to make the
best compiler (NP-hard,...), and C compiles to platform specific code(ASM), so you can always improve upon the generated code or write better code yourself. It's another question how well can a human compiler take advantage of the CPU architecture(for example: compilers tend to be smarter when it comes to scheduling), but it's common to be able to do better than the "sufficiently decent compiler". Wether there's any point in humans wasting their time doing that is another question...