The slot is 64 bits and the architectural register is 32, so a word view
of the union is only right while the two coincide. Word() and SetWord()
replace f/UL/SL and are the identity, so nothing that runs changes; what
it buys is that the compiler names every place that reads a slot as a
word, which is the set the next commit has to relocate.
The x86 tier is not built here and still reads the members directly.
Three stepdiff triage upgrades built during the Jak 3 artifact hunt:
- EERUNNER_VU0FP=1 mixes VU0 macro-visible state (VF00-31, ACC, the
STATUS/MAC/CLIP flag VIs) into the divtrace fingerprint and captures it
in FullSnap/DiffFullSnaps, so the zoom breaks at the EE block whose COP2
macro emission first produced divergent VU0 state instead of only when
it later lands in a GPR or memory (the default fingerprint surfaced the
Jak 3 fMax vertex flood at an unrelated memcpy). VF is memory-resident
at every block boundary per the COP2 VF-cache seam policy, so the JIT
block-prologue sample site reads consistent state. Opt-in: the benign
filters were tuned without VU0 fields, and mVU-vs-interp has by-design
NaN/clamp corners.
- EERUNNER_CENSUS=1 stops the zoom hard-stopping at the first non-benign
divergence: each data/control site is reported compactly, ResyncAfter
walks past TRANSIENT ones (DMA-phase staging buffers, poll-phase
control-flow splits that reconverge), and the walk stops at the first
PERSISTENT site. Persistent control-flow sites also dump the JIT-side
guest regs at the split entry (busy-poll operands), the polled word when
it resolves to RAM, and both sides' frame-end SPR channel registers.
- The stepdiff candidate-real branch now re-runs the frame once per mode
from the same checkpoint and byte-diffs EE RAM+scratch (ReportMemDiff,
max_show now a parameter): with a clean interp control every differing
byte is a real JIT store difference, at frame-local granularity.
Co-Authored-By: Claude <noreply@anthropic.com>
DiffJitVsInterp harness (EE/IOP/VU synthetic JIT-vs-interpreter tests) plus the
shared capture/divergence-localizer infrastructure (vu_capture, ee_divtrace,
microVU_Divtrace, VU1Trace) and the test hooks they install in interp/GIF/COP2 paths.
All hook sites are guarded by PCSX2_RECOMPILER_TESTS and compile out of release builds.
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>
pstef
Brian DegenhardtandClaude
