For a conventional branch predictor on a semi-modern (P6+ era) out of order processor, it would be pretty surprising to have the critical path run through the branch predictor. Ofc. a metal fix for could change this as could an unconventional design, as well as other things.
If by under load you mean not overclocked but under load. And as I'm sure you know, there was a fairly serious CPU correctness bug found by your employer during that timeframe, unsurprisingly against a whitelisted vendor.
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What percentage of chips couldn't handle lock cmpxchg8b eax? We're not talking about well formed code, we're talking about adversarial code from the web, designed to trigger edge cases or exercise obscure parts of the spec. Not sure spectre was relevant to NaCl, rowhammer was.
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what percentage of Intel chips or banned Centaur chips? I'm not saying that chips never fail, I'm just saying that your whitelisted vendors have the most complex and therefore the most likely to fail chips and this is what we've seen in practice.
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