gpderetta

65 ms·

1291.
by gpderetta 2y ago
You can set fast math (or a subset of it) on a translation unit basis.
1292.
by gpderetta 2y ago
The best way to do this is via constitutional protection that can't be overridden by ordinary law. The EU has a de-facto a constitution in the form of the ECHR and the various treaties, which do protect fundamental rights, but there ar
1293.
by gpderetta 2y ago
Even with fire and forget, your send queue might become full. So you either drop the message of you have to wait for it to empty. Similarly on the receiving end you have to block waiting for the queue to become non empty. In fact that&#x27
1294.
by gpderetta 2y ago
> Think since their CPU is LE then payload should be LE as well for performance. This is false because even on ancient hardware this would not take more than 3 cycles (in a context of network communication shaving off 3 cycles is a hilar
1295.
by gpderetta 2y ago
The fast path can still be fast. You can make the blocking behaviour optional for those that need it.
1296.
by gpderetta 2y ago
That was the original implementation. I believe this has since been relaxed. I think the kernel will allocate a pipe internally in some cases. The man pages are known to be incomplete. In fact I think sendfile is implemented with the splice
1297.
by gpderetta 2y ago
build an Event Count on top of eventfd and you can get fast pathed blocking behavior on your shared memory queue that it is also async awaitable on top of your event loop of choice.
1298.
by gpderetta 2y ago
I think the linking with the flush-to-zero code nonsense has been moved to a separate flag in recent GCCs.
1299.
by gpderetta 2y ago
Thanks, that's a nice explanation. I hadn't looked in details of how the multiple decoders in the *monts worked. Relying on branches and prediction to find the instruction boundaries is quite a nifty trick.
1300.
by gpderetta 2y ago
It is actually probably cheaper than the alternative of attempting to decode at all possible instruction boundaries in parallel!
1301.
by gpderetta 2y ago
> For basic asm I would assume then that the register contents cannot be relied on to contain the value of the variable, but as long as you don't rely on it, then you are in the clear. That's the crux. The example invokes &#x27
1302.
by gpderetta 2y ago
Yes, the best way to understand python closures is that scopes are first class objects in python (accessible via locals()) and closures close over the containing scope itself, not the single variables. Also worth keeping in mind that, AFAI
1303.
by gpderetta 2y ago
it comes up often enough for me to be annoying. The defaulted argument works, but it is an ugly hack. It is not obvious to me that the surprising semantics are clearly better, but python has a long history to preferring implementation simp
1304.
by gpderetta 2y ago
Typical workaround: def loop(): for number in range(10): def closure(number=number): return number yield closure Many languages have surprising behaviour when closing over iteration variables.
1305.
by gpderetta 2y ago
> it's behaving as documented. what do you think the documented behaviour is? None is documented, so it is undefined. The only defined behaviour is with extended asm. Remember in C and C++ everything is UB unless defined in the st
1306.
by gpderetta 2y ago
Do US consumers buy less Made In China stuff than EU ones? According to ustr.gov, US imports from China in 2022 were worth $562.9 billion. According to eurostat EU imports from China were 627.3€ billion, so a significant difference (note th
1307.
by gpderetta 2y ago
GCC says that register extensions are not supported with basic asm. What happens if you do it anyway is not documented. Ergo UB.
1308.
by gpderetta 2y ago
That's just the summary. If you follow the link to "EU Directive on the sale of consumer goods and associated guarantees" [1], Article 5.3 states: "3. Unless proved otherwise, any lack of conformity which becomes appare
1309.
by gpderetta 2y ago
> The term at which burden of proof shifts from the retailer to the consumer has been raised to 1 year in the EU This is great to know. Unfortunately yes, UK won't pick it up automatically. And yes, in practice you need enough proo
1310.
by gpderetta 2y ago
Did she pay with credit card? Often even debit cards offer chargeback although it is not a statutory right.
1311.
by gpderetta 2y ago
A not often discussed problem with the EU guarantee is that in the first 6 months, every defect is presumed to have been present at the time it was bought. After 6 months it is on the consumer to prove it, and for most things it is just n
1312.
by gpderetta 2y ago
I believe that MSVC inline asm allows referencing variables in the asm as it can parse and understand the asm (at least before they got rid of inline asm completely for 64 bit code). AFAIK GCC does not attempt to parse the asm by design, a
1313.
by gpderetta 2y ago
I think that named register variables (a GCC extension) are meant to be live in asm block by design, so they shouldn't be optimized away. Still I would use extended asm. edit: from the docs: "The only supported use for [Specifying
1314.
by gpderetta 2y ago
Aside from the flame-baity strawman, I'm not sure for which behaviour you are exactly arguing for.
1315.
by gpderetta 2y ago
So you would have different, say, distinct division operators for each of u8, u16, u32, u64, u128 and their signed variant, for each floating point type, complex numbers (and all their underlying variants), quaternions, etc? You might quick
1316.
by gpderetta 2y ago
Are you saying that it is intuitive that 4/2 should return a floating point number? Or the type of the result should depend on the value? I would expect that no C or C++ programmer would find it intuitive
1317.
by gpderetta 2y ago
You can have allocation-less empty std::string even without SSO. The empty string simply uses a statically allocated shared buffer. That's what libstdc++ did in its old refcounted variant, for example. And no, you don't need refco
1318.
by gpderetta 2y ago
"The social network formerly known as Twitter". At least when in polite company.
1319.
by gpderetta 2y ago
Turin is now... Turambar!
1320.
by gpderetta 2y ago
Xitting. Pronounce it however you prefer.

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