Re: Green Compiler ?

Hans-Peter Diettrich <DrDiettrich1@aol.com>
Fri, 28 Dec 2012 08:35:52 +0100

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From: Hans-Peter Diettrich <DrDiettrich1@aol.com>
Newsgroups: comp.compilers
Date: Fri, 28 Dec 2012 08:35:52 +0100
Organization: Compilers Central
References: 12-12-010 12-12-012 12-12-022
Keywords: performance
Posted-Date: 28 Dec 2012 10:24:07 EST

Peter Dassow schrieb:


> But I'm not sure this kind of optimization
> would save a significant percentage compared to an clock cycle
> optimized binary.


I doubt that a clock cycle count is related to power consumption.
On modern CPUs, with much parallel processing, parts of the chip may be
inactive while others are operating. E.g. when two instructions execute
in parallel, they will consume about the same amount of power as when
executed sequentially.


Please note that most CMOS processor power consumption results from
switching (stray) capacities, and only a small percentage for leak
currents. E.g. a register or gate consumes such power whenever a bit is
changed, and almost nothing when it has reached an stable state.


DoDi


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