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我想做8bit的饱和加法，但是似乎没有这样的内联指令，如果使用+符号的话还得加判断，就怕使用判断而阻止软件流水，所以想问一下该怎么处理8bit饱和加法的操作？谢谢
SADDU4可以实现4个无符号8bit加饱和。
