Matthew Stanley
b0391bc778
tooling: PSX_FORCE_INTERP — measure the dirty-RAM interp's cycle model
...
Adds a force-interp knob (dirty_ram_is_dirty reports all RAM above the
kernel window dirty when PSX_FORCE_INTERP=1) so the dispatcher routes
clean compiled game text through the dirty-RAM interpreter — the SAME
path overlays take — with no emitter/dispatch change. This is the
interp-path Δ-ruler enabler: it lets the cyctest isolation loops be
measured native-INTERP vs Beetle.
RESULT — the dirty-RAM interpreter == Beetle EXACT on all 12 ruler#2
components (baseline/alu/load/load2/load_use/div/div_spaced/mult/
gte_rtps/gte_nclip/gte_read_use/ld_div). The interpreter's per-instruction
load-delay + GTE/muldiv interlock is now MEASURED equal to the oracle and
to the compiled backend, not merely shared-by-construction.
Process notes (cost real time, now documented in the cyctest README):
- launch psx-cyctest via PowerShell Start-Process; a bash '&' launch
fails to boot (pc=0).
- sample cyc_watch / freeze_check at STEADY STATE: an early query (before
the BIOS boots to the EXE entry) reports dirty_ram_insns=0 / warm-up
values. This premature-sampling artifact was the whole "dispatch
paradox" — the interp engages only after the EXE entry is reached.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com >
2026-06-27 16:13:58 -07:00
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