alt Hacker NewsThe article makes no mention of optimisation use cases. In case anyone already knows off the top of their heads and before I start digging for the answer, is part of the intent here for these to inform the optimiser stages, perhaps similarly to what the if (!(some_condition)) { __builtin_unreachable(); } idiom can achieve?
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i2talics • today at 5:15 PM
I don't get the impression that these are meant to influence optimization at all.
Allegedly the pre and post conditions, in varying degrees of certainty according to the evaluation semantics selected, are propagated to the optimization passes of gcc and llvm. However, I haven’t seen any detailed blog posts or summaries of the effectiveness or reliability of this feature. Sorry it’s not a lot of info, but it was what I knew off hand based on previous reading.