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tekochip
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Platinum
Real World Performance
tekochip   3/21/2012 8:00:58 AM
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Most of my work is in small to medium-sized appliances, I've used 32 bit cores in a few places, but the venerable 8 bit machines continue to improve in performance too. Recently I had to crunch some graphics quickly and simply assumed that I use an Cortex Arm, but I was tempted by the Silicon Labs 8051. I decided to build the code in each core and see where my best performance would be. To my surprise the Silicon Labs outperformed the Cortex. As I looked at the disassembly, I could see that the real loser was the GCC compiler I used with the Cortex. For the Silicon Labs part I had used Keil's 8051 compiler, which produced very tight code, but on the Cortex I was using the GCC compiler from the development kit.
The point being that the design solution is more than just how many bits the core has. A poor instruction set or compiler will quickly erode away the gains made in processing power, so always power up those development kits and crunch some code to see what the real world performance is.


Ann R. Thryft
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Blogger
What's behind the price drop?
Ann R. Thryft   3/21/2012 4:10:22 PM
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Chuck, that's an incredible price drop. What's making it possible? New materials or processes? A design shrink?


Charles Murray
User Rank
Blogger
Re: What's behind the price drop?
Charles Murray   3/21/2012 9:10:18 PM
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On-board Flash can be costly, Ann. By using the so-called Thumb Instruction set, they were able to reduce the amount of Flash and therefore reduce the price.

Battar
User Rank
Platinum
Not many pins
Battar   3/22/2012 9:31:57 AM
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Since about 30% of the cost of a chip is the package, you will not get more than 20 pins for 30 cents. If you want to drive an LCD and need lots of GPIO pins, be prepared to pay 4 times that sum. By the way, NXP have M0 core devices on the market for less than 1$ already.

naperlou
User Rank
Blogger
Re: Real World Performance
naperlou   3/22/2012 9:54:12 AM
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tekochip, thanks for that post.  It is good to see someone who actually tries both of the alternatives and understands the difference.  When moving to 32-bit, there are just more options.  In addition, the compiler builders may make some assumptions in moving to 32-bit that one could not afford at the 8-bit level.  This is also a weakness of the open source model.  I have heard this situation before, albiet not between two processors, but between two compilers.  When producing code for PC's or higher-end microprocessors it is not a big deal if the compiler is not all that effecient.  When programming microcontrollers, it is.

Aldo Agraz
User Rank
Iron
Re: Real World Performance
Aldo Agraz   3/22/2012 10:49:37 AM
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This are good news, electronics and computer processing costs are always going down and that is something we must take advantage of to design more efficient and environmentally friendly technologies.

Ann R. Thryft
User Rank
Blogger
Re: What's behind the price drop?
Ann R. Thryft   3/22/2012 12:40:19 PM
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Thanks for the explanation, Chuck. Too bad flash continues to be relatively expensive.


Charles Murray
User Rank
Blogger
Re: Real World Performance
Charles Murray   4/17/2012 7:33:16 PM
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I agree, Aldo. A price of 30 to 50 cents for 32-bit is amazing.



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