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为ARMv7-A编译的程序运行在ARMv8-A处理器上，这时候会有性能损失吗

czwei

为ARMv7-A编译的程序可以运行在ARMv8-A处理器上，程序使用了ARMv7支持的neon指令，测试发现在ARMv8-A设备有性能损失，有人知道原因吗？相比直接运行在ARMV7-A处理器上，是有额外开销吗

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