Both comments predate GetCPUTicks() reading CNTVCT_EL0 and give a tick
scale this host does not have; one of them leaves a plain tick count
looking like a duration. The code under them already divides by
GetTickFrequency(), and is unchanged.
Each of the three spin-then-sleep semaphore loops watches a single
atomic word, but ShortSpin() has no way to know that: it spends its
share of SPIN_TIME_NS in batches of eight isb, and every one of those is
a pipeline flush. arm64 can watch the word itself, so ShortSpinOn()
does, and the loops that hold their whole predicate in one word take it.
Hosts that cannot watch an address keep the old spin.
Inspired by Whatcookie's work on arm64 for rpcs3.
Merges yaps2/main (github.com/yaps2/yaps2, c16b88cb7) into ARMSX2,
replacing the arm64 recompiler family with the yaps2 JITs and importing
the yaps2 testing, perf, and libretro infrastructure. Common ancestor is
upstream PCSX2 342db5152 (2026-06-19); git auto-merged all but 38 files.
Replaced (deleted in this merge, recoverable from history):
- arm64/aR5900*, aR3000A*, aVU* -> arm64/iR5900*/iR3000A*/microVU*-arm64:
EE static-pin register file with lazy dirty tracking, dual-residence
allocator, IOP block linking, native COP2 macro ops, inline unaligned
fastmem, persisted VU program cache, call-ret shadow ring, VU0 spin
fast-forward.
- MVU_DIFF shadow-run hooks in shared VU interpreter TUs (superseded by
the offline vurunner JIT-vs-interp oracle).
Imported from yaps2:
- tests/ctest/core/recompilers: ~80 gtest suites (EE/IOP/VU differential
harnesses, fuzzers, ABI digest tripwire, capture format pins) plus the
gs_vertex_tests kernel oracle.
- pcsx2-vurunner / pcsx2-eerunner headless capture-replay runners.
- tools/perf counter-based A/B rigs, perf jitdump productionization,
PmuCounters, clang-perf/clang-handheld presets.
- pcsx2-libretro core (ENABLE_LIBRETRO, default OFF; rename pending).
- GS vertex-kick fast path (GV series): TBL-based packed parse,
register-resident kick, scalar-outcode cull, fused draw-rect/FindMinMax.
- Null renderer, VK_KHR_display direct WSI, swapchain PresentStats.
- SPU2 NEON mixer vectorization, EE timer read clamp (NFL 2K5 hang),
IOP ioman signed-compare fix, assorted UB fixes.
Kept from ARMSX2 in the both-touched files:
- iOS dual-map W^X and fastmem-unavailable resilience (Memory, HostSys,
vtlb). The split data/code area model is retained; both areas now take
fixed VA hints so cached VU JIT code stays deterministic on Linux.
- Android thread-affinity model, VMState shutdown early-outs, all
platform frontends, branding, CI, RetroAchievements identity/policy.
- GSDeviceVK: ARMSX2's push-descriptor decision logic (Mali crash gate,
proprietary-vs-turnip Adreno split) merged with yaps2's descriptor-pool
exhaustion recovery (flush + render-pass restart instead of dropped
binds). Vendor feature policy is the union: Mali fbfetch policy with
MediaTek/G57/Xclipse gates from ARMSX2; Adreno stencil/ROV/
test-and-sample-depth hang avoidance and no_ps2_z_quantization from
yaps2.
Build-system notes:
- The Qt debugger is now gated behind ENABLE_QT_DEBUGGER (default off on
arm64) so handheld builds drop the KDDockWidgets dependency.
- GSDeviceNone and remaining yaps2 GS code were ported to the newer
upstream GSTexture Usage-flags API.
The replaced backend's interpreter-fallback glue (intExecuteOneInst,
AndroidEEOpHist) and the EEDiffVerify runtime differ are retained for
now; dead pieces will be removed in a follow-up commit.
Vulkan render fixes (GS device backends), Oboe audio backend, GameDB armsx2_overrides.yaml override loader, EE+VU mac-port recompiler graft, PGO=optimize, and the VU-slam fix: an Android-only force-float in VMManager::SetEmuThreadAffinities (the slam was thread pinning locking the VU1 worker off the prime core, not the VU codegen). Also: CPU-name SoC-property fallback, Mali VK attachment-feedback-loop crash gate, MediaTek fbfetch disable, and on-device thread-placement diagnostic helpers.
The recompiler grafts and GS deltas are unguarded and land in the shared core (they reach the mac/Linux arm64 builds) - see REFACTOR_STATUS.md items 2 and 3 for the reconciliation this still needs; the VU graft is reducible to just the force-float fix.
CMake/preset wiring for the ARM64 target, the vixl C++20 enum-conversion warning
suppression, PmuCounters (cycle/instret PMU reads), and the Perf jitdump dir/enable
controls (EmuConfig.Profiler.EnablePerfDump, redirected out of /tmp into the cache
dir). Plus small platform/build fixes (ALSA thread naming, SmallString, X11 guards,
ARM MIDR CPU-name fallback, gcc lambda decay). The ARCH_ARM64 status banner now
reflects that EE/IOP/VU recompilers are all implemented.
Co-Authored-By: Ryan Walklin <ryan@testtoast.com>
Co-Authored-By: Brian Degenhardt <bmd@bmdhacks.com>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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