Allow me to summarize x86 side channel attacks: Spectre v1: speculation is insecure by design Spectre v2: secure branch prediction matters Meltdown: Intel are dumbasses L1TF: Intel are monumental, inexcusable dumbasses PortSmash: hyperthreading is insecure by design
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Probably more saved precious silicon space for something else, more aggressive/smarter prediction maybe. But now I'm just blindly speculating.
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~64 AND gates are not going to save them any significant silicon space. If they *explicitly* chose not to add them for performance, they're idiots. I think it's more likely they had an implicit culture of not considering the security implications at all.
End of conversation
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