There are lots of compiler bugs. The further you stray from the common use cases the more likely you are to hit them. There are also an appreciable number of h

There are lots of compiler bugs. The further you stray from the common use cases the more likely you are to hit them. There are also an appreciable number of hardware bugs. Some of the complexity in compilers is working around those so that applications don't need to. Your own compiler, assuming it emits machine code and avoids documented and undocumented hardware bugs, can be error free.