CB>No.  But I know where to spend my time.  On things that give a heck of a
CB>lot better improvement than low level optimizations would, and things
CB>that are far more portable and consistent.  This is especially true
CB>considering how very very different the multiple sources would have to
CB>be for them to 'optimal' for the wide variety of processors.
No. The 'tweaking for machines' is compiling the same source with different 
optmiztions switched.
Optmizing code is optmizing the code to make it run faster on all machines.
... I like womens like I like my code: fast, tight & easy!
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