Efficacy of optimizations.

[kernel_learner]

Hi all,

 I had a general question about compiler optimizations
and believe this is a great place to ask!

First of all there are numerous number of compiler
optimizations and they each have their own
characteristics..my questions is two-fold:

1. What is the cost/benefit ratio of these
optimizations. 

2. How do these compiler optimizations interact? i.e.
does one optimization negate the effect of another
optimization if done in a particular order?

Looking forward to replies..

Cheers!
LearNER

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