Hacker News: brigade

New comment by brigade in "Dav2d"

brigade — Sat, 02 May 2026 20:27:41 +0000

There's an order of magnitude difference in speed requirements between file format parsing and image decoding, then another order of magnitude difference to video decoding. Even rav1d reuses dav1d's assembly (most of the actual runtime) to approach its speed.

New comment by brigade in "Networking changes coming in macOS 27"

brigade — Mon, 27 Apr 2026 17:59:56 +0000

Still true for extended attributes, which Finder and Spotlight love to query.

New comment by brigade in "USB Cheat Sheet (2022)"

brigade — Sun, 26 Apr 2026 01:27:18 +0000

Even backwards compatibility is optional in USB4. There are USB4 devices (SSDs at least) that will not function when connected to USB 3 ports.

New comment by brigade in "XOR'ing a register with itself is the idiom for zeroing it out. Why not sub?"

brigade — Wed, 22 Apr 2026 08:17:37 +0000

Zero micro ops to be precise, that’s handled entirely at the register rename stage with no data movement.

New comment by brigade in "XOR'ing a register with itself is the idiom for zeroing it out. Why not sub?"

brigade — Wed, 22 Apr 2026 08:06:55 +0000

Cortex A8 vsub reads the second source register a cycle earlier than veor, so that can add one cycle latency

Not scalar, but still sub vs xor. Though you’d use vmov immediate for zeroing anyway.

New comment by brigade in "New Apple Silicon M4 and M5 HiDPI Limitation on 4K External Displays"

brigade — Mon, 30 Mar 2026 08:39:04 +0000

Fine, you made me look it up. M1 Air defaults to 2880x1800 on a 2560x1600 display, which is a 1.125x scaling. Nowhere near the 1.5x you claim.

New comment by brigade in "New Apple Silicon M4 and M5 HiDPI Limitation on 4K External Displays"

brigade — Mon, 30 Mar 2026 07:16:23 +0000

Apple never supersamples by 2x. Default MacBook Air scaling was around 1.1x iirc.

New comment by brigade in "New Apple Silicon M4 and M5 HiDPI Limitation on 4K External Displays"

brigade — Mon, 30 Mar 2026 06:38:12 +0000

OP dances around the key context that this isn’t hidpi, but rather a 3rd party hack that uses hidpi rendering to supersample their “native” 4k resolution by 2x, since the end result looks more pleasing to them than the native 4k render.

New comment by brigade in "ICAO issued new power bank restriction on flight"

brigade — Sun, 29 Mar 2026 00:05:32 +0000

And that itself is a recent policy change from just in the last two months; as of January United's official policy [1] matched the FAA's in only requiring checked devices to be powered down

[1] https://web.archive.org/web/20260129152627/https://www.unite...

New comment by brigade in "Apple randomly closes bug reports unless you "verify" the bug remains unfixed"

brigade — Wed, 25 Mar 2026 20:43:04 +0000

It’s really a question of whether a team believes bugs are defects that deserve to be fixed, or annoyances that get in the way of shipping features. And all too often, KPIs and promotions are tied to the features, not the bugs.

Plus, I’ve been in jobs where fixing bugs ends up being implicitly discouraged; if you fix a bug then it invites questions from above for why the bug existed, whether the fix could cause another bug, how another regression will be prevented and so on. But simply ignoring bug reports never triggered attention.

New comment by brigade in "Florida judge rules red light camera tickets are unconstitutional"

brigade — Mon, 09 Mar 2026 20:27:07 +0000

That's why I said generally - once testimony is compelled, it can no longer be used against you. And the definite exception for compelling your name is if the government already believes that you committed a crime and is trying to figure out who you are, and you cannot articulate specifically why your name could be incriminating.

5th amendment protections can include questions of identity, if the question of identity is relevant for incrimination. Like, if the government has a warrant for "Joe Smith", you're not required to testify whether that's you. It's usually a waste of time since could just prove it with the non-testimonial evidence that lead to your arrest, but the protection does exist.

New comment by brigade in "Florida judge rules red light camera tickets are unconstitutional"

brigade — Mon, 09 Mar 2026 18:46:28 +0000

First, you have the right to say nothing at all; there is no requirement to incriminate someone else to protect yourself.

Second, you can still generally invoke the 5th amendment during testimony even if you already claimed someone else did it. You aren't under oath until said testimony, so it still protects against you having to choose between committing perjury or self-incrimination, and doing so cannot be used as evidence of either.

New comment by brigade in "Florida judge rules red light camera tickets are unconstitutional"

brigade — Mon, 09 Mar 2026 18:06:25 +0000

Most of the world also doesn't have the same degree of protections against self-incrimination that the 5th amendment provides. If someone shot a person with my gun, while the police can obviously ask questions, in the US I have the right to not answer and force them to prove beyond a reasonable doubt who fired it.

New comment by brigade in "Arm's Cortex X925: Reaching Desktop Performance"

brigade — Wed, 04 Mar 2026 00:16:28 +0000

It’s not a hard limit, especially if you aren’t pushing the frequency wall like Intel. AMD used to use a 2-way 64kb L1, Intel has an 8-way 64kb L1i on Gracemont, and more to the point, high-end ARM Cortex has had 4-way 64kb L1 caches since before they even supported 16kb pages.

New comment by brigade in "AVX2 is slower than SSE2-4.x under Windows ARM emulation"

brigade — Wed, 18 Feb 2026 17:42:17 +0000

ARM favored wider ILP and mostly symmetric ALUs, while x86 favored wider and asymmetric ALUs

Most high-end ARM cores were 4x128b FMA, and Cortex-X925 goes to 6x128b FMA. Contrast that to Intel that was 2x256b FMA for the longest, then 2x512b FMA, with another 1-2 pipelines that can't do FMA.

But ultimately, 4x128b ≈ 2x256b, and 2x256b < 6x128b < 2x512b in throughput. Permute is a different factor though, if your algorithm cares about it.

New comment by brigade in "Why E cores make Apple silicon fast"

brigade — Sun, 08 Feb 2026 17:40:53 +0000

Your first example is a CPU limitation that Instruments doesn't model (does perf?), but is still mostly better than Intel chips that are limited to 4 dynamic counters (I think still? At least that's what I see in the Alder Lake's Golden Cove perfmon files...)

Your second example, is the complaint that Instruments doesn't have flamegraph visualization? That was true a decade ago when it was written, and is not true today. Or that Instrument's trace file format isn't documented?

New comment by brigade in "Teaching my neighbor to keep the volume down"

brigade — Sun, 01 Feb 2026 21:29:28 +0000

A quick google suggests that British Columbia's building code only requires STC 50 which is "you can hear but not understand a neighbor's loud conversation" levels of isolation. Though maybe your city has stricter requirements?

STC 50 is a common requirement in the US too.

New comment by brigade in "Chromium Has Merged JpegXL"

brigade — Tue, 13 Jan 2026 19:19:25 +0000

AFAIK Jyrki came after WebP was already announced to add lossless support; rather I’d consider Skal the creator inasmuch as it was originally just an image container for VP8 intra. He was working on WebP2 at the time Google rejected JPEG-XL and also was not involved in that decision.

New comment by brigade in "The struggle of resizing windows on macOS Tahoe"

brigade — Sun, 11 Jan 2026 23:05:15 +0000

Are there even any billboards in Cupertino?

New comment by brigade in "We might have been slower to abandon StackOverflow if it wasn't a toxic hellhole"

brigade — Wed, 07 Jan 2026 15:58:43 +0000

As someone who did predominately use stack overflow through Google search… I remember that half the time the top result was someone asking the question I had, only for it to be duped to a different question that didn’t answer the original. So they failed there.