Comment # 25 on bug 1212101 from Nikolai Nikolaevskii

ILL problem is in using SSE instruction in AVX notation.
This bug is distinct from bmo #1837201.

My bug report in bmo: https://bugzilla.mozilla.org/show_bug.cgi?id=1838323

Copy from bmo #1838323:
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ILL bug persist only on the newest Linux distributions, such as openSUSE
Tumbleweed.
openSUSE bugzilla: https://bugzilla.opensuse.org/show_bug.cgi?id=1212101
Possibly this is not Firefox bug, but gcc or compile options or something
other.

Batch of crash reports:
https://crash-stats.mozilla.org/signature/?product=Firefox&signature=libxul.so%400x3c912e0%20%7C%20libxul.so%400x3da095a%20%7C%20firefox%400x17eee&date=%3E%3D2023-06-06T20%3A12%3A00.000Z&date=%3C2023-06-13T20%3A12%3A00.000Z&_columns=date&_columns=product&_columns=version&_columns=build_id&_columns=platform&_columns=reason&_columns=address&_columns=install_time&_columns=startup_crash&_sort=-date&page=1#summary

Info from "Crash Report" - "Raw Data and Minidumps":

"crash_info": {

"address": "0x00007fe6fbe912e0",
"assertion": null,
"crashing_thread": 0,
"instruction": "vshufps xmm0, xmm0, xmm0, 0x0",
"memory_accesses": [ ],
"type": "SIGILL / ILL_ILLOPN"

Instruction vshufps is a SSE instruction coded in AVX notation, that is why it
requires AVX support: https://www.felixcloutier.com/x86/shufps
CPUs without AVX support will hang.
Hint: older Intel Celerons & Pentiums don't support AVX, it begins with Alder
Lake for desktops:
https://en.wikipedia.org/wiki/List_of_Intel_Celeron_processors
Intel Atom CPUs support - since Gracemont microarchitecture (end of 2022 year):
https://en.wikipedia.org/wiki/Gracemont_(microarchitecture)

Users need SSE instruction in SSE coding.

Instead of AVX-styled
 vshufps xmm0, xmm0, xmm0, 0x0

I expect SSE-styled
 shufps xmm0, xmm0, 0x0
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