Before a compiler can produce code that is trustworthy and effective, a lot of factors need to be taken into account. The compiler can't produce good code without taking these factors into account. Explain?

What benefits does the Compiler Phases have? Explain the process in detail and offer an example to back it up.

Compilers that are optimised are necessary because... As a computer programmer, what kinds of uses can you find for it? Is there any conceivable circumstance in which you wouldn't find the use of one of these devices to be beneficial?

Before a compiler can write code that is both trustworthy and efficient, it must take a number of factors into account. The compiler can't generate correct code without these factors being taken into account. Explain?