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Hi caotianxiang,
regarding 1, it seems almost all the intrinsic were abandoned in the ARM Compiler 6. However, you can make the equivalent functions by using the __attribute__((always_inline)) function attribute and the __asm keyword (i.e. inline assembler).
Regarding 2, I am afraid the "dspfns.h" is no longer supported in the ARM Compiler 6.Anyway, I am not familiar to the armcc or armclang and my answers might be wrong.
Best regards,Yasuhiko Koumoto.