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Compiler/CC1125: CC112x and Viterbi

Part Number: CC1125

Tool/software: TI C/C++ Compiler

I am trying to implement a vectorized viterbi solution for CC11125. I tried using IWMMXT (with instructions mentioned in mmintrin.h) but seems it is not compatible with cortex-m7. Using IWMMXT gives following error:

warning: switch -mcpu=cortex-m7 conflicts with -march=iwmmxt switch

error: iWMMXt unsupported under Thumb mode

Is it possible to use some vectorization with CC1125. Any help? or pointers for SIMD on cc1125.