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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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Zhongwei Yao
over 7 years ago
in reply to
sunhuino1
了解
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Zhongwei Yao
over 7 years ago
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sunhuino1
了解
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