Using environment Rowley CrossStudio for ARM 3.6.4 . GCC 4.9

using cycle counter (yes)

interrupt overhead : (irrelevant, most likely in my setup) (asm) irqs 
only set off flags...

for kissfft 5ws F4, I wonder why you have 112500 cycles and I have 
141000. Something for me to look at .


-O2 but I also have a bunch of debug symbol stuff in there dunno I think 
it is only symbol data at DB2 which pushes up the image size.

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