[sybreon]

Measuring the relative power draw due to flipping logic can definitely be done with present day simulation tools. The question is whether there is any significant advantage in saving X% of power in the processor core. In a complex system, the processor rarely sucks up most of the power. Someone should actually do this as a research and find out if there are any significant savings.

I am guessing that it will all be architecturally specific. An ARM will have a different power profile to a MIPS running the same C code. Personally, I would like to see the option of a -Op switch to GCC that selects power-optimised code paths.