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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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This gets rid of some more absolute addrs in the MIPS dynarec.
Tested on several platforms, we should be good.
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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 removes libco and all the usages of it (+pthreads).
Rewired all dynarecs and interpreter to return after every frame so that
libretro can process events. This required to make dynarec re-entrant.
Dynarecs were updated to check for new frame on every update (IRQ, cycle
exhaustion, I/O write, etc). The performance impact of doing so should
be minimal (and definitely outweight the libco gains). While at it,
fixed small issues to get a bit more perf: arm dynarec was not idling
correctly, mips was using stack when not needed, etc.
Tested on PSP (mips), OGA (armv7), Linux (x86 and interpreter). Not
tested on Android though.
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Fix a C func call while at it. This is a prerequisite to make the
dynarec re-entrant and get rid of libco
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Turns out this was not even used! No need to fix it then!
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This gets rid of stack usage (except for callback invocations) in the
dynarec execution code. A requirement to make the dynarec re-entrant.
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Fix some small issues, mainly associated with undefined behaviour
expressions
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..to reduce dcache trashing
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newer gcc wants this
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