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6678中运行8192点复数的fft周期过长

我在dsplib库中找到DSP_fft32x32_66_LE_ELF中找了其中DSP_fft32x32.c函数和gen_twiddle_fft32x32.c新建工程,配置时钟为1GHz,然后函数的输入、输出、旋转因子的地址都在L2里面,用TSCL测周期数为1530934,相当于1.5ms,这个正常么