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Cortex M3 compilers and benchmarks

Note: This was originally posted on 20th January 2009 at http://forums.arm.com

Please help me identify the best compiler for CortexM3.
I currently use armcc from ARM, but curious if that is the best option on the market. So far, I found a couple of options for Cortex M3 compilers: GCC, armcc (RVCT 3.1) and IAR. What I cannot find is the benchmarking results or comparison between those compilers. Are there any other notable compilers/linkers for Cortex M3 that I missed?
I am mainly interested in code density and run time efficiency of the compiled image.

Thank you in advance!

Andrey
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