If dcache is enabled when the game starts, initializing the fastmem
arena is still useful in case the user changes the dcache setting.
And initializing it doesn't really cost anything.
Preparation for the next commit.
JitArm64 has been conflating these two flags. Most of the stuff that's
been guarded by fastmem_arena checks in fact requires fastmem.
When we have fastmem_arena without fastmem, it would be possible to do
things a bit more efficiently than what this commit does, but it's
non-trivial and therefore I will leave it out of this PR. With this
commit, we effectively have the same behavior as before this PR - plus
the added ability to toggle fastmem with a cache clear.
This is needed so that the checks added in the previous commit will be
reevaluated if the value of m_enable_dcache changes.
JitArm64 was already recompiling its asm routines on cache clear by
necessity. It doesn't have the same setup as Jit64 where the asm
routines are in a separate region, so clearing the JitArm64 cache
results in the asm routines being cleared too.
Some code paths in EmuCodeBlock.cpp that were checking fastmem_arena
should really also be checking m_enable_dcache.
Because JitArm64 centralizes more or less all memory access to the
EmitBackpatchRoutine function and because that function already
contained a check, JitArm64 works fine without the additional checks
added by this commit. Regardless, I added the checks to MMU.cpp instead
of EmuCodeBlock.cpp where applicable so they would be available to
JitArm64. Maybe one day JitArm64 will need them if its code gets
restructured.
When evaluating whether jo.fastmem should be set to true, we check the
value of jo.fastmem_arena. However, due to a change made in 28e8117b90,
jo.fastmem_arena wasn't set until after the first time we set
jo.fastmem, so jo.fastmem would end up always being false until the next
time RefreshConfig was called.
Fixes https://bugs.dolphin-emu.org/issues/13364.
This bug has been lurking in the code ever since I added the discard
functionality. It doesn't seem to be triggered all that often,
and on top of that the emitted code only runs conditionally, so I'm not
sure if people have been affected by this bug in practice or not.
We need to check for the address of the *previous* instruction, because
checking fifoWriteAddresses happens not at the end of the instruction
that triggered it but at the start of the next instruction.
By not setting a stepSize, stepSize was getting set to the default
value of 0, which is an Int. This later caused a crash when trying to
cast it to Float.
While both fastmem and the BLR optimization depend on fault handling,
the BLR optimization doesn't depend on fastmem, and there are cases
where you might want the BLR optimization but not fastmem. For me
personally, it's useful when I try to use a debugger on Android and have
to disable fastmem so I don't get SIGSEGVs all the time, but it would be
especially useful for iOS users.
Because CPU thread config changed callbacks are no longer instant,
g_Config.iEFBScale doesn't yet contain the new value when the hotkey OSD
code tries to read it.
Should fix https://bugs.dolphin-emu.org/issues/13343.
There's no reason not to allow this now that these settings are
cleanly integrated into the new config system. (Actually, maybe
we could even have done this before the previous commit...)
This fixes a problem where changing the JIT debug settings on
Android while a game was running wouldn't cause the changed settings
to apply to code blocks that already had been compiled.
We had one implementation of this type of data structure in Arm64Emitter
and one in VideoCommon. This moves the Arm64Emitter implementation to
its own file and adds begin and end functions to it, so that VideoCommon
can use it.
You may notice that the license header for the new file is CC0. I wrote
the Arm64Emitter implementation of SmallVector, so this should be no
problem.
Turns out that we have two subsystems that want to register CPU thread
callbacks from a different thread than the CPU thread: FreeLookConfig
and VideoConfig. Both seem to happen from the host thread before the CPU
thread starts, so there's no thread safety issue. But ideally, if we
want to allow registering callbacks from threads other than the CPU
thread, we should make registering callbacks actually thread-safe. This
is an unsolved problem for the regular Config system, so I would like to
leave it outside the scope of this PR.
This fixes a problem that started happening in CoreTimingTest after the
previous commit. CPUThreadConfigCallback registers a Config callback
only once per run of the process, but CoreTimingTest calls
Config::Shutdown after each test, and Config::Shutdown was clearing all
callbacks, preventing the callback from running after that.
In theory, our config system supports calling Set from any thread. But
because we have config callbacks that call RunAsCPUThread, it's a lot
more restricted in practice. Calling Set from any thread other than the
host thread or the CPU thread is formally thread unsafe, and calling Set
on the host thread while the CPU thread is showing a panic alert causes
a deadlock. This is especially a problem because 04072f0 made the
"Ignore for this session" button in panic alerts call Set.
Because so many of our config callbacks want their code to run on the
CPU thread, I thought it would make sense to have a centralized way to
move execution to the CPU thread for config callbacks. To solve the
deadlock problem, this new way is non-blocking. This means that threads
other than the CPU thread might continue executing before the CPU thread
is informed of the new config, but I don't think there's any problem
with that.
Intends to fix https://bugs.dolphin-emu.org/issues/13108.
In std::string, you can store strings using any encoding, but in Dolphin
we have decided to use UTF-8. The problem is that if you convert between
std::string and std::filesystem::path using the built-in methods, the
standard library will make up its own assumption of what encoding you're
using in the std::string. On most OSes this is UTF-8, but on Windows
it's whatever the user's code page is.
What I believe is the C++ standard authors' intended solution to this is
to use std::u8string instead of std::string, but that's a big hassle to
move over to, because there's no convenient way to convert between
std::string and std::u8string. Instead, in Dolphin, we have added helper
functions that convert between std::string and std::filesystem::path in
the manner we want. You *always* have to use these when converting
between std::string and std::filesystem::path, otherwise we get these
kinds of encoding problems that we've been having with custom textures.
Fixes https://bugs.dolphin-emu.org/issues/13328.
Should fix https://bugs.dolphin-emu.org/issues/13178.
Jit64 doesn't need to do this because it stores PC directly into
ppcState instead of first storing it in a register.
Now block link nearcode is back to a length of three instructions.
Unfortunately, the code I'm adding to Jit.cpp ends up being a bit messy
because we need to handle the case of already being in farcode...
Jumping between linked blocks currently works as follows: First, at the
end of the first block, we check if the downcount is greater than zero.
If it is, we jump to the `normalEntry` of the block. So far so good. But
if the downcount wasn't greater than zero, we jump to the `checkedEntry`
of the block, which checks the downcount *again* and then jumps to
`do_timing` if it's less than zero (which seems like an off by one error
- Jit64 doesn't do anything like this). This second check is rather
redundant. Let's jump to `do_timing` where we previously jumped to
`checkedEntry`.
Jit64 doesn't check the downcount on block entry. See 5236dc3.
Dolphin no longer supports Windows 7, so the fact that there are (were?)
more people who use Windows 7 than who use a GPU that doesn't support
the required feature is no longer relevant.
JosJuice