byuu says:
Changelog:
- added nall/bit-field.hpp
- updated all CPU cores (sans LR35902 due to some complexities) to use
BitFields instead of bools
- updated as many CPU cores as I could to use BitFields instead of union {
struct { uint8_t ... }; }; pairs
The speed changes are mostly a wash for this. In some instances,
I noticed a ~2-3% speedup (eg SNES emulation), and in others a 2-3%
slowdown (eg Famicom emulation.) It's within the margin of error, so
it's safe to say it has no impact.
This does give us a lot of new useful things, however:
- no more manual reconstruction of flag values from lots of left shifts
and ORs
- no more manual deconstruction of flag values from lots of ANDs
- ability to get completely free aliases to flag groups (eg GSU can
provide alt2, alt1 and also alt (which is alt2,alt1 combined)
- removes the need for the nasty order_lsbN macro hack (eventually will
make higan 100% endian independent)
- saves us from insane compilers that try and do nasty things with
alignment on union-structs
- saves us from insane compilers that try to store bit-field bits in
reverse order
- will allow some really novel new use cases (I'm planning an
instant-decode ARM opcode function, for instance.)
- reduces code size (we can serialize flag registers in one line instead
of one for each flag)
However, I probably won't use it for super critical code that's constantly
reading out register values (eg PPU MMIO registers.) I think there we
would end up with a performance penalty.
byuu says:
Changelog:
- WS: fixed bug when IRQs triggered during a rep string instruction
- WS: added sprite attribute caching (per-scanline); absolutely massive
speed-up
- WS: emulated limit of 32 sprites per scanline
- WS: emulated the extended PPU register bit behavior based on the
DISP_CTRL tile bit-depth setting
- WS: added "Rotate" key binding; can be used to flip the WS display
between horizontal and vertical in real-time
The prefix emulation may not be 100% hardware-accurate, but the edge
cases should be extreme enough to not come up in the WS library. No way
to get the emulation 100% down without intensive hardware testing.
trap15 pointed me at a workflow diagram for it, but that diagram is
impossible without a magic internal stack frame that grows with every
IRQ, and can thus grow infinitely large.
The rotation thing isn't exactly the most friendly set-up, but oh well.
I'll see about adding a default rotation setting to manifests, so that
games like GunPey can start in the correct orientation. After that, if
the LCD orientation icon turns out to be reliable, then I'll start using
that. But if there are cases where it's not reliable, then I'll leave it
to manual button presses.
Speaking of icons, I'll need a set of icons to render on the screen.
Going to put them to the top right on vertical orientation, and on the
bottom left for horizontal orientation. Just outside of the video
output, of course.
Overall, WS is getting pretty far along, but still some major bugs in
various games. I really need sound emulation, though. Nobody's going to
use this at all without that.
byuu says:
Got it. Wow, that didn't hurt nearly as much as I thought it was going
to.
Dropped from 127.5fps to 123.5fps to use Natural/Integer for
(u)int(8,16,32,64).
That's totally worth the cost.
byuu says:
All 256 instructions implemented fully. Fixed a major bug with
instructions that both read and write to ModRM with displacement.
Riviera now runs into an infinite loop ... possibly crashed, possibly
waiting on interrupts or in to return something. Added a bunch of PPU
settings registers, but nothing's actually rendering with them yet.
244 of 256 opcodes implemented now, although the interrupt triggering
portions are missing from them still. Much better handling of prefixes
now.
I definitely have a newfound hatepreciation for x86 now >_>
byuu says:
26 hours in, 173 instructions implemented. Although the four segment
prefix opcodes don't actually do anything yet. There's less than 256
actual instructions on the 80186, not sure of the exact count.
Gunpey gets around ~8,200 instructions in before hitting an unsupported
opcode (loop). Riviera goes off the rails on a retf and ends up
executing an endless stream of bad opcodes in RAM =( Both games hammer
the living shit out of the in/out ports pretty much immediately.
byuu says:
Man, the 80186 is taking a lot longer to implement than I thought it
would. So far I'm 18 hours into this emulator. Whereas I had Super Mario
Bros fully playable (no sound) in 12 hours for the NES >_>
I refactored all the byte/word variant functions to single functions
that take a size parameter. Cuts the amount of code in half.
Also implemented repz/repnz + movsb/movsw, so Riviera now gets 299
instructions in before dying. Nobody really bothers to explain how the
CPU actually implements these instructions, but I think I have it right:
ignore non-string opcodes that follow rep, invoke the string operations
inside the rep opcodes to prevent interrupts from triggering between the
two (which will be even more fun for segment selector overrides ...)
The next opcode needed is 0xC7, which ... throws ModRM on its head. In
this mode, ModRM is only used to determine the target operand (and it
doesn't use the middle bits for that at all), and the source is an
immediate that follows it. Gonna have to waste a few more hours thinking
about how best to handle that.
Also, disabled HiDPI for higan as well on OS X.
byuu says:
More V30MZ implemented, a lot more to go.
icarus now supports importing WS and WSC games. It expects them to have
the correct file extension, same for GB and GBC.
> Ugh, apparently HiDPI icarus doesn't let you press the check boxes.
I set the flag value in the plist to false for now. Forgot to do it for
higan, but hopefully I won't forget before release.
byuu says:
Lots of improvements. We're now able to start executing some V30MZ
instructions. 32 of 256 opcodes implemented so far.
I hope this goes without saying, but there's absolutely no point in
loading WS/WSC games right now. You won't see anything until I have the
full CPU and partial PPU implemented.
ROM bank 2 works properly now, the I/O map is 16-bit (address) x 16-bit
(data) as it should be*, and I have a basic disassembler in place
(adding to it as I emulate new opcodes.)
(* I don't know what happens if you access an 8-bit port in 16-bit mode
or vice versa, so for now I'm just treating the handlers as always being
16-bit, and discarding the upper 8-bits when not needed.)
Tim Allen