AWR1642: How to find header file for FFT C mode in DSPlib dsplib_c64Px_3_4_0_0?

Part Number:AWR1642

Hi champion,
    When customer want to use C natural FFT16*16 API DSP_fft16x16_cn.c in dsplib_c64Px_3_4_0_0, they find the header file DSP_fft 16*16_cn.h includes below header file. These files are not in the dsplib package, could you help to find where customer can find these files?

#ifndef __TI_COMPILER_VERSION__           // for non TI compiler
#include "C6xSimulator.h"                 // intrinsics prototypes
#include "C6xSimulator_type_modifiers.h"  // define/undefine typing keywords
#include "assert.h"
#endif

Thanks,
Adam