> My two cents,
> please read :
> http://www.t4f.org/articles/optimization-of-microchip-pic-xc8-compiler-in=
-free-and-pro-mode/

He is making the usual mistake that the free compiler is 'inserting unneede=
d instructions to make the pro version look good instead of thinking in ter=
ms of how a compiler works. What he is seeing in the initial compilation by=
 the free compiler is totally unoptimised code that is then optimised by fu=
rther passes of the compiler through the initially generated code.
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