"turns out theres a lot of quirks with the div instructions we havent been covering
if the denom is 0, we jump to the end and mov eax/rax to dst, which is correct because ppc raises no exceptions for divide by 0 unlike x86
except we don't initialize eax before that jump, so whatever garbage from the previous sequence that has been left in eax/rax is what the result of the instruction will be
and then in our constant folding, we don't do the same zero check in Value::Div, so if we constant folded the denom to 0 we will host crash
the ppc manual says the result for a division by 0 is undefined, but in reality it seems it is always 0
there are a few posts i saw from googling about it, and tests on my rgh gave me 0, but then another issue came up
and that is that we dont check for signed overflow in our division, so we raise an exception if guest code ever does (1<<signbit_pos) / -1
signed overflow in division also produces 0 on ppc
the last thing is that if src2 is constant we skip the 0 check for division
without checking if its nonzero
all weird, likely very rare edge cases, except for maybe the signed overflow division
chrispy — Today at 9:51 AM
oh yeah, and because the int members of constantvalue are all signed ints, we were actually doing signed division always with constant folding"
fixed an earlier mistake by me with the precision of fresx
made some optimization disableable
implemented vkpkx
fixed possible bugs with vsr/vsl constant folding
disabled the nice imul code for now, there was a bug with int64 version and i dont have time to check
started on multiplication/addition/subtraction/division identities
Removed optimized VSL implementation, it's going to have to be rewritten anyway
Added ppc_ctx_t to xboxkrnl shim for direct context access
started working on KeSaveFloatingPointState, re'ed most of it
Exposed some more state/functionality to the kernel for implementing lower level routines like the save/restore ones
Add cvar to re-enable incorrect mxcsr behavior if a user doesnt care and wants better cpu performance
Stubbed out more impossible sequences, replace mul_hi_i32 with a 64 bit multiply
- Changed name of config option to apply_title_update to better reflect what that option does
- Mount TU package to UPDATE: partition
- Simplified UserModule::title_id()
- Splitted loading module into two parts to allow applying TUs and custom patches
- WinSystemClock is a FILETIME clock without scaling, can convert to
system_time
- XSystemClock is a FILTETIME clock with scaling applied, can only
convert to WinSystemClock
- Mainly use `assert`s, since failure is very rare
- Forward failure of `CreateSemaphore` to guests because it is more easy
to trigger with invalid initial parameters.
[GPU] Add FXAA post-processing
[UI] Add FidelityFX FSR and CAS post-processing
[UI] Add blue noise dithering from 10bpc to 8bpc
[GPU] Apply the DC PWL gamma ramp closer to the spec, supporting fully white color
[UI] Allow the GPU CP thread to present on the host directly, bypassing the UI thread OS paint event
[UI] Allow variable refresh rate (or tearing)
[UI] Present the newest frame (restart) on DXGI
[UI] Replace GraphicsContext with a far more advanced Presenter with more coherent surface connection and UI overlay state management
[UI] Connect presentation to windows via the Surface class, not native window handles
[Vulkan] Switch to simpler Vulkan setup with no instance/device separation due to interdependencies and to pass fewer objects around
[Vulkan] Lower the minimum required Vulkan version to 1.0
[UI/GPU] Various cleanup, mainly ComPtr usage
[UI] Support per-monitor DPI awareness v2 on Windows
[UI] DPI-scale Dear ImGui
[UI] Replace the remaining non-detachable window delegates with unified window event and input listeners
[UI] Allow listeners to safely destroy or close the window, and to register/unregister listeners without use-after-free and the ABA problem
[UI] Explicit Z ordering of input listeners and UI overlays, top-down for input, bottom-up for drawing
[UI] Add explicit window lifecycle phases
[UI] Replace Window virtual functions with explicit desired state, its application, actual state, its feedback
[UI] GTK: Apply the initial size to the drawing area
[UI] Limit internal UI frame rate to that of the monitor
[UI] Hide the cursor using a timer instead of polling due to no repeated UI thread paints with GPU CP thread presentation, and only within the window
XMountUtilityDrive-related code checks some values returned from NtDeviceIoControlFile, stub just returns values that it seems to accept
IoCreateDevice is also used by utility-drive code, writing some values into a pointer returned by it, so stub allocs space so it can write to the pointer without errors.
- Fixed incorrect calculation of available pages
- Changed amount of total virtual bytes
- Added real amount of reserved virtual bytes
- Removed unused methods
Adds a new X_KTHREAD::apc_disable_count field at 0xB0 into X_KTHREAD based on where 360 kernel seems to store it, and made CriticalRegion funcs act on that, instead of locking things between all threads, and changes DeliverAPCs to check that field before running the APCs.
XThread::LockApc/UnlockApc were also updated too as those previously called into EnterCrit/LeaveCrit to work, but AFAIK the code that uses LockApc/UnlockApc does have an actual need for locking between threads, so changed them to work on XThread::global_critical_region_ directly instead.
