PR #11183 regressed the lookup table reconstruction and, for some reason, added an else clause that clobbered the dCache whenever dCache emulation is turned on.
The previous code only updated the PLRU on cache misses, which made it so that the least recently inserted cache block was evicted, instead of the least recently used/hit one.
This regressed in 9d39647f9e (part of #11183, but it was fine in e97d380437), although beforehand it was only implemented for the instruction cache, and the instruction cache hit extremely infrequently when the JIT or cached interpreter is in use, which generally keeps it from behaving correctly (the pure interpreter behaves correctly with it).
I'm not aware of any games that are affected by this, though I did not do extensive testing.
These lookup tables total 4 megabytes, and contain data that's entirely redundant to the actual cache state (as part of an optimization, though I'm not sure whether the optimization actually is useful). This change instead recomputes these lookup tables when loading the state (which involves filling the lookup table with a marker (0xff), and then setting the 128 * 8 valid entries (1 kilobyte)).
SPDX standardizes how source code conveys its copyright and licensing
information. See https://spdx.github.io/spdx-spec/1-rationale/ . SPDX
tags are adopted in many large projects, including things like the Linux
kernel.
Specifically, 'Scooby-Doo! Mystery Mayhem', 'Scooby-Doo! Unmasked', 'Ed, Edd n Eddy: The Mis-Edventures', and the Wii version of 'Happy Feet'.
The JIT cache causes problems with emulated icache invalidation in these games, resulting in areas failing to load.
Converts the remaining PowerPC code over to fmt-capable logging.
Now, all that's left to convert over are the lingering remnants within
the frontend code.
Two of these arrays were stored within the save state when the exact
same data is constructed all the time.
We can just build this into the binary rather than the save state,
shrinking a little bit of the save state's overall size.
And use it for reporting games that rely on ICache emulation to some
degree. We know of a few but it would be interesting to get a more
exhaustive list from crowdsourcing.
This moves all the byte swapping utilities into a header named Swap.h.
A dedicated header is much more preferable here due to the size of the
code itself. In general usage throughout the codebase, CommonFuncs.h was
generally only included for these functions anyway. These being in their
own header avoids dumping the lesser used utilities into scope. As well
as providing a localized area for more utilities related to byte
swapping in the future (should they be needed). This also makes it nicer
to identify which files depend on the byte swapping utilities in
particular.
Since this is a completely new header, moving the code uncovered a few
indirect includes, as well as making some other inclusions unnecessary.
Makes it more obvious which data is going into the savestate.
It also allows PowerPCState and InstructionCache to potentially
contain members that don't necessarily need to be saved to the save state.
It also gets rid of any potential padding data being put into the save
state.
The constructor sets up way_from_valid and way_from_plur as fast lookup
tables for implementing the PLRU algrothm. Then the Init function
memsets them to zero, meaning the instruction cache will now always
choose the first way in each set.
This degrades the cache from 128 sets, 8 way to 128 sets, 1 way.
Not only does fixing this bug increase accuracy, but it increases
preformance too, giving a 1% speedup to interpreter.
The PowerPC CPU has bits in MSR (DR and IR) which control whether
addresses are translated. We should respect these instead of mixing
physical addresses and translated addresses into the same address space.
This is mostly mass-renaming calls to memory accesses APIs from places
which expect address translation to use a different version from those
which do not expect address translation.
This does very little on its own, but it's the first step to a correct BAT
implementation.
Lioncash
get
Admiral H. Curtiss
Pokechu22
TheLordScruffy
Pierre Bourdon
Shawn Hoffman
Lioncash
Silent
Scott Mansell
Tillmann Karras
Stevoisiak
magumagu
Fiora
Rohit Nirmal
Jasper St. Pierre