gpderetta

8 ms·

121.
Std: Fewer [pdf](isocpp.org)
3 points by gpderetta 7mo ago|1 comments
122.
by gpderetta 7mo ago
arm64 added a load acquire instruction which I think it is fast enough on actual hardware that might not be worth bothering with consume. If it isn't, then load-relaxed plus atomic_signal_fence might be your best bet. Good luck!
123.
by gpderetta 7mo ago
Expression templates do AST manipulation of expressions at compile time. Let's say you have a complex matrix expression that naively maps to multiple BLAS operations but can be reduced to a single BLAS call. With expression templates y
124.
by gpderetta 7mo ago
3-days special operation.
125.
by gpderetta 7mo ago
IMHO incompetent malice is as much likely.
126.
by gpderetta 7mo ago
re 3, clang has [[trivial_abi]] (and I believe GCC is also implementing it. But it won't be applied to standard types by default, because of course is ABI breaking. You'll have to derive your own.
127.
by gpderetta 7mo ago
use templates.
128.
by gpderetta 7mo ago
Interesting, apparently it did scoreboarding like the CDC6600 and allowed multiple memory loads in flight, but I can't find a definite statement on whether it did renaming (I.e. writes to the same registers stalled). It might not be Oo
129.
by gpderetta 7mo ago
Was i960 OoO?
130.
by gpderetta 7mo ago
That's happens often in parliamentary proceedings: when the other party succeeds in unrecognizably amending the law, the party proposing it will vote against. Specifically for the European Parliament, this is also why, while it is true
131.
by gpderetta 7mo ago
> We do? What did you think the European Parliament elections every four years were for? Probably it is not taught as part of the curriculum in Russia.
132.
by gpderetta 7mo ago
People directly elects MEPs. And the Parliament literally right now just put a check on the Council. Many EU nations are not presidential, and personally I prefer parliamentary republics than presidential ones.
133.
by gpderetta 7mo ago
That should completely change the regulation from mass surveillance to targeted wiretapping with a warrant.
134.
by gpderetta 7mo ago
Gorgoroth sounds about right.
135.
by gpderetta 7mo ago
As an EU citizen, I'm happy that the parliament has once again rejected the proposal, which at least gives credence to the notion that it not just there to rubber-stamp what the commission decides. But the price of freedom is indeed et
136.
by gpderetta 7mo ago
Pentium were the first superscalar x86 from intel, but were still in-order. Pentium-Pro (a completely different microarchitecture) was the first OoO intel x86 microarchitecture.
137.
by gpderetta 7mo ago
> https://cpp.godbolt.org/z/EYnWET8sT I'm afraid that just C++ being C++ and you are deep into UB; you can't really modify a constexpr value at runtime, and if you cast away its constness with what is effe
138.
by gpderetta 7mo ago
Yes I know, GCC has a long standing bug open on the issue :(.
139.
by gpderetta 7mo ago
Even in 2026, wars are won by the side that can shoots more bullets (or artillery rounds, or rockets, or missiles, or drones). They better be cheap.
140.
by gpderetta 7mo ago
Aside from the fact that the signal mask is still relevant in 2026 and even for multithreaded programs, that doesn't have anything to do with the fact that POSIX requires swapcontext to preserve it.
141.
by gpderetta 7mo ago
> mustn't catch (...) You could use the same trick used by glibc to implement unstoppable exceptions for POSIX cancellation: the exception rethrows itself from its destructor.
142.
by gpderetta 7mo ago
GCC still uses sj/lj by default on some targets to implement exceptions.
143.
by gpderetta 7mo ago
A stackful coroutine implementation has to save exactly the same registers that a stackless one has to: the live ones at the suspension point. A pure library implementation that uses on normal function call semantics obviously needs to cons
144.
by gpderetta 7mo ago
A proposal to add stackfull coroutines has been around forever and gets updated at every single mailing. Unfortunately the authors don't really have backing from any major company.
145.
by gpderetta 7mo ago
Unfortunately swap context requires saving and restoring the signal mask, which, at least on Linux, requires a syscall so it is going to be at least a hundred times slower than an hand rolled implementation. Also, although not likely to be
146.
by gpderetta 7mo ago
setjmp + longjump + sigaltstack is indeed the old trick.
147.
by gpderetta 7mo ago
> There must be some perceptible difference between an intelligence w/ consciousness and one without I think there are differences, and I think we can make good guesses, but I'm not sure we can reliably classify a P-zombie from
148.
by gpderetta 7mo ago
I'm using two variables because numeric literals have the wrong type and bit_cast rejects transmutations between differently sized types. I could have written it as x = bit_cast<bool>(char{2}), but does it really make a differenc
149.
by gpderetta 7mo ago
Great post. Ah, interesting, so wfm does both the wait and the acquire! When using eventfd it is indeed annoying having to both poll and later read to disarm the object (there are epoll tricks that can be used but are not generalizable). Th
150.
by gpderetta 7mo ago
This comes up often, but what can it do that poll can't?

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