That will give negative impact. Look, i have 30MSps burst data. why should i wait to get all data, if i can process data while DMA load data to internal memory ?. that's why i check if i have new data, and i do my math without waiting.Only benefit is that when i get DMA compleate interrupt, i will stop checking my dma register, since at this point i know that all data is inside, and i free to do math with it. But because when i get DMA interrupt,all math with array is done anyway, so ni point in that.
One solution is to make loops in hardware with asm,and keep real and imag data inside registers and don't push it to memory, but i am no good at asm programming