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main函数调用 DSPF_sp_fftSPxSP (N, &ptr_x_sa[0], &ptr_w[0], ptr_y_sa, brev, rad, 0, N); （该函数有8个入参）//线性汇编后的FFT
而线性汇编时库函数是这么写的：
_DSPF_sp_fftSPxSP .cproc A_n, B_ptr_x, A_ptr_w, B_ptr_y 此时才有4个参数，有点不解，求大神解惑
关于汇编函数传参请参考SPRU186 assembly laguage tools user guide，及如下的汇编例子。
http://www.deyisupport.com/question_answer/dsp_arm/c6000_multicore/f/53/t/52927.aspx
函数原型有8个入参，但是线性汇编怎么就4个入参，有点不理解？
