ideally there's a two step process here: 1. make a sanitizer for the UB available 2. later on, exploit the UB for optimization we're doing these things backwards way too oftenhttps://twitter.com/shafikyaghmour/status/1176243229047451648 …
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John Regehr Retweeted Shafik Yaghmour
ideally there's a two step process here: 1. make a sanitizer for the UB available 2. later on, exploit the UB for optimization we're doing these things backwards way too oftenhttps://twitter.com/shafikyaghmour/status/1176243229047451648 …
John Regehr added,
Or zero steps: don’t do optimizations that break existing code.
you know as well as I do that existing C/C++ code does everything, so clearly one has to make some hard choices here
Existing JS code does everything too and yet that committee is able to keep 99% (probably more nines than that) working despite the language growing significantly.
And not sure that PDP11 has anything to do with it. That’s the opposite argument, that says we should make the spec flexible for implementors. Implementors have already settled ABI disputes that prevented the spec from being more specific in the past so that’s not a valid excuse.
the point is that "don't break any programs" is a nonsensical position when we're talking about C and C++. a lot of old (and even new) codes work only because use after free behaves a certain way, and you're going to keep supporting those? I doubt it
Agreed; that ship sailed the moment people decided that strict aliasing was a workable idea
Heck, I’m pretty sure there are some programs out there using inline asm that depend on the specific register allocation that some compiler came up with.
Older versions of the GCC inline asm docs allude to programs doing this.pic.twitter.com/RRGPSGOR5f
nice, ouch
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