what are the architectural differences between Cortex A8 and cortex A9
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Sathish
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difference between cortex a8 and cortex a9
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isogen74 
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Posted 01 July 2010 - 09:46 AM
sathishpitta, on Jul 1 2010, 07:27 AM, said:
what are the architectural differences between Cortex A8 and cortex A9
http://www.arm.com/products/processors/cor...a/cortex-a8.php
http://www.arm.com/products/processors/cor...a/cortex-a9.php
http://www.arm.com/f...9Processors.pdf
Lots of details on the above pages.
They are both v7-A architecture, so they are pretty similar from the programmers model perspective with the exception that the Cortex-A9 is also available in a multi-core version.
As always there are lots of microarchitecture changes which don't affect the programmers model. The highlights for me would be that A9 is out-of-order with speculative exceution, improving instruction throughput, and it has lower latency when moving values between NEON/VFP register file and the ARM register file, which makes using floating point significantly more efficient in software. The whitepaper PDF linked above includes lots more information.
When optimizing software, consider that the quickest code to run is the bit you removed from the call path.
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