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关于OMAPl138中ARM核和DSP核的指令执行速度问题,ARM执行同样的delay指令,速度比DSP慢6.5倍之多,为什么?

如下指令

while(1)
{
unsigned int i = 0xffffff;

while(i--)
{

}
}

在ARM端和DSP端,分别利用profile  enable clock 测试 ARM执行一个delay周期速度比DSP慢6.5倍之多,为什么