Reply to post: Re: Intel "shouldn't be selling CPUs?"

Meltdown/Spectre week three: World still knee-deep in something nasty

Phil O'Sophical Silver badge

Re: Intel "shouldn't be selling CPUs?"

Speculative execution means that the CPU will decide to take a given branch because the branch predictor has guessed that this branch will be taken. This speculative branch is taken while other instructions are in-flight.

Yes, that I understand.

My confusion was that I was assuming that "conditional branch" meant something like a single "branch if xxx" instruction, whereas "unconditional branch" would be "branch always". I wasn't allowing for them to be separated, where a preceding test would later be followed by a branch always, the combination being the "conditional branch" which could be speculatively executed. Thanks.

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