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This patch adds big-endian compatibility in gpsp (in general but only
for the interpreter). There's no performance hit for little-endian
platforms (should be a no-op) and only add a small overhead in memory
accesses for big-endian platforms.
Most memory accesses are wrapped with a byteswap instruction and I/O reg
accesses are also rewired for proper access (using macros). Video
rendering has been fixed to also do byteswaps but there's a couple of
games and rendering modes that still seem broken (but they amount to
less than 20 games in my tests with 1K ROMs).
This also adds build rules and CI for NGC/WII/WIIU (untested)
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This reduces code size more than 20% (which is 200-300KB!).
DMA handling accounts for less than 0.5% the average emulation runtime
which doesn't justify the crazy optimization level that the code has. In
fact it's more than likely that the new code runs faster due to less
I-cache trashing.
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This should correct some minor issues in some games.
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This works on both interpreter and dynarec.
Tested in MIPS, ARM and x86, still needs some more testing, some edge
cases can be buggy.
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Handle already translated blocks in the ARM asm to speed up indirect
branches (affect some games more than others)
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Makes accesses more efficient for MIPS. Make accesses also fast for palette
reads.
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Fix a small bug in MIPS dynarec that affects non -G0 targets
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This saves a few cycles in MIPS and simplifies a bit the core.
Removed the write map, only affects interpreter performance very
minimally. Rewired ARM and x86 handlers to support direct access to
I/EWRAM (and VRAM on ARM) to compensate. Overall performance is slightly
better but code is cleaner and allows for further improvements in the
dynarecs.
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Added a more thorough cache cleanup for reset/mode-change too.
Fixed the mmap initialization that ends up leaking memory.
Minor x86 asm fixes for Android.
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This is not really necessary since it can share area with ROM.
Performance impact should be very minimal (haven't noticed it myself)
and could be compensated (even by a positive offset) if we bump the ROM
cache area size.
Tested with several dynarecs.
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Also rewrite a bit memory handlers for smaller functions.
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This allows us to emit the handlers directly in a more efficient manner.
At the same time it allows for an easy fix to emit PIC code, which is
necessary for libretro. This also enables more platform specific
optimizations and variations, perhaps even run-time multiplatform
support.
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Will move also OAM structures to gain a few cycles per load/store.
Loads can also be optimized for an extra instruction per access.
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This is unnecessary since newlib supports all file I/O.
This is needed for other mips ports
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The dynarec expects function args to be located in registers instead of
the stack, which is not the default calling convetion in GCC/clang.
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This causes crashes in PSP quite often in many games. Other CPUs might
(depending on the processor state) silently return zero or some
undefined value.
The fix is borrowed from ReGBA's codebase
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- Based on notes, gpSP's RTC does was based on vba.
- I've updated relevant sections of it based on latest vba.
reference issue: https://github.com/libretro/gpsp/issues/79
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- Adds core option to allow battery saves using the libretro api
(retro_get_memory_data/size)
- Initial save size set at 128KB and actual size is automatically
determined internally by gba.
- This will always assume that a save file is supported since save
size or type cannot be determined until gba tries to write to backup memory.
- A 128KB block of memory is used as buffer, similar method to VBA
Next/Beetle GBA workarounds.
Fix https://github.com/libretro/gpsp/issues/72
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according to aliaspider
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