> This means that all medium price or high price smartphones that were introduced during the last 4 years have SVE2 support.

Except Qualcomm chipsets, which disable SVE even if all ARM cores used support it. ("Snapdragon 8 Elite Gen 5" supposedly finally supports SVE? but that's like only half a year old)

Indeed we shall hope heuristics update; but of course if no compilers emit it hardware has no reason to actually bother making fast misaligned ops, so it's primed for going wrong.

> No, it was released to customers in June 2021, almost five years ago.

Ah, okay. (still, like, at least a couple decades newer than the last x86-64 chip with slow unaligned mem ops, if such ever existed at all? Haven't heard of / can't find anything saying any aarch64 ever had problems with them either, so still much worse for the RISC-V side).

Well, I suppose we can hope that business/politics messes will all never happen again and won't affect anything RVA23.

P550 is, like, what, only a year old? I suppose there has been some laughing at it at least.

Also Kendryte K230 / C908, but only on vector mem ops, which adds a whole another mess onto this.

I'd hope all the massive OoO will have fast misaligned mem ops, anything else would immediately cause infinite pain for decades.

But of course there'll be plenty of RVA23 hardware that's much smaller eventually too, once it becomes a general expectation instead of "cool thing for the very-top-end to have".

I do agree that it'd be reasonable to just assume fast misaligned ops, but for whatever reason gcc and clang just don't, and that's what we have for defaults.

Of course that'd result in entirely-avoidable slowdown for the potentially-misaligned ops. Perhaps fine for a program that doesn't use them frequently, but quite bad for ones that need misaligned ops everywhere.

In terms of correctness, there's also the possibility of partially-misaligned ops (e.g. an 8B load with 4B alignment, loading two adjacent int32_t fields) so you're not handling everything with correct faults anyways.