22年我做一个在kp920上纠错码的kernel优化，当时就遇到各种奇怪的问题。
典型的就是访存带宽的问题。
另一个当时觉得匪夷所思的是向量性能很迷惑，当混杂向量指令和小循环时，整个处理器的性能会退化到接近顺序处理器的性能。现在看来很可能是调度队列大小+整数向量跨域前递的问题。
典型的就是访存带宽的问题。
另一个当时觉得匪夷所思的是向量性能很迷惑，当混杂向量指令和小循环时，整个处理器的性能会退化到接近顺序处理器的性能。现在看来很可能是调度队列大小+整数向量跨域前递的问题。
商业角度我不懂，单纯从处理器设计的角度，kp920给我的感觉是一个设计初期堆feature堆到一半的产品，和香山南湖甚至雁栖湖甚至龙芯杯作品的情况比较相似。基本是没有做细节上的打磨，非常多的corner case极易在某些常见应用上遇到问题。相当一些设计没有做过fine tuning甚至说benchmark，连在spec 06/17上都没有做。这个设计水平距离同时代的A76都差了不少，更不要说苹果和Intel了。
现在无需怀疑kp920是买的A76改改了，前端设计一塌糊涂，访存像是龙芯杯作品，这就是信创灵车吗…
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#学习
《An Alternative TAGE-like Conditional Branch Predictor》
提出一套自适应的 Allocation Throttling 方法，可以消除 Cold entry 问题和 Allocation Rate 不合适的问题
https://dl.acm.org/doi/10.1145/3226098
《An Alternative TAGE-like Conditional Branch Predictor》
提出一套自适应的 Allocation Throttling 方法，可以消除 Cold entry 问题和 Allocation Rate 不合适的问题
https://dl.acm.org/doi/10.1145/3226098
