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关于5517移植speex的问题

今天在C5517上移植了speex,发现200M的CPU频率下,压缩16K采样率20ms的数据确要130ms时间。。这么慢。用arm做168M主频才13ms,有没有人在C5517上跑成功过,我想了下是不是16位内核在某些运算上比32位内核慢。。估计是的,但是还是不甘心