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by Taniwha
4585 days ago
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depends on the CPU - but it's relatively trivial thing to build (especially because unlike other caches it's a stack) on x86s return nominally is ALWAYS a bad pipe bubble: a pop followed by an indirect jump - the pop gets resolved at the end of its micro-op and the jump wants to be resolved early on so as to start decoding the next instruction In the end it can't hurt to generate a bad jump prediction off of the return cache, it's no worse than being idle - the effect of messing with the cache though can cause it to always fail so as a result you get no advantage from it |
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