[Feature Request] Intel Fast Memset

Question

[Feature Request] Intel Fast Memset

Opened this issue a month ago · 6 comments

Software with intel_fast_memset instructions doesn't work. Plese, add support for patching Intel Fast Memset.

Answer 1 · 2024-12-07T05:16:40.000Z

Can you provide further information on the programs that use intel_fast_memset and crash?

Answer 2 · 2024-12-08T16:05:48.000Z

On my Ryzen 5950X system, a fresh install of Luminar AI will not successfully launch. I'm using OpenCore 1.0.3 along with the latest Lilu & related kexts, as well as the release of IntelMKLFixup from this repo.

After applying the following patch (adapted from here), the application launches and operates correctly:

sudo perl -i -pe 's|\x90\x90\x90\x90\x56\xE8\x6A\x00|\x90\x90\x90\x90\x56\xE8\x3A\x00|sg' '/Applications/Luminar AI.app/Contents/Frameworks/MPCore.framework/Versions/A/Frameworks/libtbb.dylib'

sudo perl -i -pe 's|\x90\x90\x90\x90\x56\xE8\x4A\x00|\x90\x90\x90\x90\x56\xE8\x1A\x00|sg' '/Applications/Luminar AI.app/Contents/Frameworks/MPCore.framework/Versions/A/Frameworks/libtbb.dylib'

sudo perl -i -pe 's|\x90\x90\x90\x90\x56\xE8\x6A\x00|\x90\x90\x90\x90\x56\xE8\x3A\x00|sg' '/Applications/Luminar AI.app/Contents/Frameworks/MPCore.framework/Versions/A/Frameworks/libtbbmalloc.dylib'

sudo perl -i -pe 's|\x90\x90\x90\x90\x56\xE8\x4A\x00|\x90\x90\x90\x90\x56\xE8\x1A\x00|sg' '/Applications/Luminar AI.app/Contents/Frameworks/MPCore.framework/Versions/A/Frameworks/libtbbmalloc.dylib'

Answer 3 · 2024-12-09T03:25:34.000Z

@cmarhoover , as per the thread:

Looks like it changes two registers, EBP and EDI on those files (considering those lines are reference to commands and registers)
A longer debug would be needed to fully understand it, but it is no jump/noop change.
It is either an address change, or a register change.

How is this related to IntelMKLFixup?

Answer 4 · 2024-12-09T13:01:04.000Z

Apologies! My mistake for not fully understanding what this patch does. I have it saved with a collection of other patches for Adobe applications. Please disregard.

Answer 5 · 2024-12-18T09:15:02.000Z

Can you provide further information on the programs that use intel_fast_memset and crash?

I'm using OM Workspace for example. With this fix it crashes on launch but if intel_fast_memset is also patched, it works. It's also very common in Adobe software.

Answer 6 · 2024-12-18T18:35:53.000Z

I appreciate the response, we'll take a look at it whenever possible