中文社区论区 neon的vabs_s16指令是不是会丢失-32768

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neon的vabs_s16指令是不是会丢失-32768

Song Bin 宋斌 over 7 years ago

RT

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sunhuino1 over 7 years ago in reply to Zhongwei Yao +1

谢谢管理员帮我提交的问题，这个问题是我问的。 vabs_s16/s32的返回值看 arm-neon.h的定义是 int16x /int32x , 如果后续的操作是vmax，如果继续使用vmax_s16/s32会导致最大值丢失。实际代码里面这样的操作比较常见。因此建议 vabs_s16 之类的返回值设置成 uint16x / uint32x 这样，以免丢失 -32768／-2xxxxx...

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sunhuino1 over 7 years ago in reply to Zhongwei Yao

我现在就是这么处理的。只是建议如果返回值定义修改成uint可能会更好。
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sunhuino1 over 7 years ago in reply to Zhongwei Yao

我现在就是这么处理的。只是建议如果返回值定义修改成uint可能会更好。
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Zhongwei Yao over 7 years ago in reply to sunhuino1

了解
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