Sorry to reply to my own post...
On Fri, Aug 7, 2009 at 11:32 PM, Raja Subramanian<[email protected]> wrote:
> In optimization parlance, this technique is called "constant folding".
> http://en.wikipedia.org/wiki/Constant_folding
You could also classify it as a "loop invariant", ie, a value
which does not change throughout the runtime of the loop and
thus can be moved above the loop body.
http://en.wikipedia.org/wiki/Loop-invariant_code_motion
This is also highlights one of the best things about optimization, any
number of optimization methods can be applied to a code block with
varying levels of success.
To help decide which optimization to use, modern compilers like
GCC, Intel compilers, and MS VC++ can use "profile guided optimization".
http://blogs.msdn.com/vcblog/archive/2008/11/12/pogo.aspx
- Raja
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