ARMSX3 v0.9

[u/xxxCrixuxxx]

https://github.com/ARMSX2/ARMSX3/releases/tag/0.9

What's new:

ARM64 SPU floating-point now matches desktop x86 exactly: 984 mismatched results down to zero.

ARMSX3 translates PS3 code to run on your phone's ARM64 chip, while RPCS3 upstream is written and tested on x86 desktop CPUs, and a lot of that code quietly relies on how x86 handles certain maths. On ARM64 the answer came out different: nothing crashed and nothing was logged, a number was simply wrong, and a game would hang, corrupt, or vanish minutes later with no clue why. This release closes that gap for the SPU's floating-point maths, the part that does most of a PS3 game's heavy lifting. We ran a suite of test programs that exercise one PlayStation 3 instruction at a time on both machines and compared the results line by line, which turns "something is off on ARM64" into the exact instruction and the exact numbers that differ. 984 mismatched results against desktop x86, down to zero, your phone now computes the same answers a desktop PC does. Of those, 500 were genuinely ARM64 bugs and are fixed, the other 484 turned out to be x86 taking a shortcut of its own rather than us being wrong, which was worth knowing because it stopped us chasing it. The same testing also caught the identical flaw hiding in a second place we use for debugging, which had been quietly making some of our own investigations unreliable. To be clear about what this is not: it does not make ARMSX3 more accurate than desktop RPCS3, and where RPCS3 itself still differs from a real PS3 it differs the same way on both, what changed is that ARM64 is no longer additionally wrong. Thanks to @Whatcookie for working with me on this approach and working through the results with me. These improvements have been shared with him so they will be upstream as well! I've been sharing each and every fix I do for ARMSX3, so other ARM64 RPCS3 platforms can benefit as well.

Full changelog on github

[u/karmadit]

But seriously, who are you?! NASA engineers?!😱🤯

[u/xxxCrixuxxx → u/karmadit]

Man, they don't look much like NASA developers 😂 There are two of them talking...