中文社区论区 NEON指令实现C语言的条件选择语句，比如 return (x>0)?x : 0.6*x; 请问用vmax和vpmax怎样实现呢

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NEON指令实现C语言的条件选择语句，比如 return (x>0)?x : 0.6*x; 请问用vmax和vpmax怎样实现呢

Alps over 7 years ago

NEON指令如何实现C语言的条件选择语句，比如 return (x>0)?x : 0.6*x; 请问用vmax和vpmax怎样实现呢

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Yang Zhang 张洋 over 7 years ago

NEON是没有条件跳转指令的，你可以使用 VCEQ, VCGE, VCGT, VCLE, VCLT 和 VBIT, VBIF, VBSL来减少条件跳转。
可以参考一下下面blog的2.2节
community.arm.com/.../arm-neon-optimization
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Yang Zhang 张洋 over 7 years ago

NEON是没有条件跳转指令的，你可以使用 VCEQ, VCGE, VCGT, VCLE, VCLT 和 VBIT, VBIF, VBSL来减少条件跳转。
可以参考一下下面blog的2.2节
community.arm.com/.../arm-neon-optimization
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Alps over 7 years ago in reply to Yang Zhang 张洋

您好，非常感谢回答！下面的网址打不开呀？！
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Song Bin 宋斌 over 7 years ago in reply to Alps

可以啊，你再试试：
community.arm.com/.../arm-neon-optimization
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Song Bin 宋斌 over 7 years ago in reply to Alps

再不行的话，你加入一下这个版块：
community.arm.com/.../
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Alps over 7 years ago in reply to Song Bin 宋斌

Access Denied

You do not have permissions to perform the requested action.
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Alps over 7 years ago in reply to Song Bin 宋斌

Unfortunately, the page you've requested no longer exists. Please use the search form above to locate the information you're interested in.
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Alps over 7 years ago in reply to Yang Zhang 张洋

通过指令的逻辑组合，已经实现了条件跳转的NEON加速了。
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Song Bin 宋斌 over 7 years ago in reply to Alps

可能有Bug，我看一下
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Song Bin 宋斌 over 7 years ago in reply to Alps

这个区域施工中，我看看能不能有别的办法让大家看到
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