Some tests fail for me in VirtualBox running on AMD CPU: ``` thread.c:230: Test failed: got xmm0:lo 0 thread.c:231: Test failed: got xmm0:hi 0 thread.c:277: Test failed: got xmm0:lo 0 thread.c:278: Test failed: got xmm0:hi 0 ``` But yes, if we can skip full context store, it would be nice. I've been thinking about skipping it for `__wine_unix_call` syscall, but skipping it for more syscalls would be even nicer. I don't remember details, but full context store was needed to pass existing ntdll AVX tests. It's possible that they depend on triggering some 'slow' code path one way or another, I guess we will find out when we try to implement this. I think that the plan is to stop using ms_abi for syscalls and depend on syscall dispatcher to deal with ms_abi->sysv conversion, but for that we need to get rid of remaining direct calls first. -- https://gitlab.winehq.org/wine/wine/-/merge_requests/1244#note_13136