> the current position of the Berkeley team is that overflow checking just adds ... | Hacker News

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renox on Dec 15, 2014 | parent | context | favorite | on: Berkeley’s RISC-V Wants to Be Free

> the current position of the Berkeley team is that overflow checking just adds a single rarely taken branch, which can easily be predicted

I find this argument VERY weak: you need many of these 'very rarely taken branch' overflow checking instructions and they pollute the instruction cache..

leoc on Dec 17, 2014 [–]

And that's also assuming that all of the necessary checks will in fact be added!

renox on Dec 22, 2014 | [–]

I don't think that this part is really an issue: if the compiler by default adds the checks and only remove the checks very conservatively..

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