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Cycle Number For 1024 Complex FFT on R52+ Neon
I cannot find any information on the number of CPU cycles it takes to execute a 1024 Complex FFT, 32-bit floating-point data size, on an R52+ using Neon. Assume that the code executes from TCM and all data is in TCM. Also, I see examples of 4x4 matrix multiply, but no information on the number of CPU cycles it takes.
Cortex-R52 exception priority
Hi Do the Cortex-R52 exceptions have priority ? If for the particular timing, two exceptions happen at the same time, such as IRQ and abort exceptions, what CPU will do ? BR, Grace
Cortex-R52+: measure the number of executed instructions
Hi Is there any way to measure the total number of executed instructions for a piece of code ? I have tried the PMU event - instructions architecturally executed. But the counted number was much more than the assembly instructions. Such as 1. executed one assemble instruction (like, ldr), the count of the PMU event 8 is 2 2. executed 12 assemble instructions, the count of the PMU event 8 is 14 3. executed a piece of code - the count of the PMU event 8 is around 500K. I use the system timer to monitor the execution time and then convert to the DMIPS. That is almost 2.5 times of the official DMIPS shown on the ARM website. Pls kindly give me some instructions. Thanks. Grace
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