difference between cortex a8 and cortex a9
Posted 01 July 2010 - 09:46 AM
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.