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https://github.com/RetroPortingToolKit/psxrecomp
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Matthew Stanley
d5977976e5
Closes the last steady-state cycle divergences; native now == Beetle on the complete 12-loop ruler #2 suite. - MFC2/CFC2 (GTE reg -> GPR read): new psx_gte_read stalls to gte_ts_done AND hands the stall amount to following instructions as a load-delay give-back (Beetle cpu.cpp:1332-1341: LDAbsorb=gte_ts_done-ts, LDWhich=rt). MTC2/CTC2 (writes) keep stall-only psx_gte_stall. - MFC0: arms ld_absorb=0 / ld_which_t=rt (Beetle delayed load) — sets ReadFudge=rt so a load in the next slot gets no fudge. - psx_muldiv_stall (MFLO/MFHI): now CONSUMES the pending load give-back while stalling to muldiv_ts_done, plus the muldiv_ts_done-1 off-by-one shortcut (Beetle cpu.cpp:1723-1736). No-load code is unaffected (read_absorb==0 -> plain advance). Wired in both static emitters (code_generator, strict_translator) and the dirty interp. METHODOLOGY (Rule 15): Beetle cyc_watch must be sampled at STEADY STATE — its warm-up window reports the no-give-back value (the source of the prior "gte_rtps +15 EXACT" mis-record; true steady Beetle = +11). Validated at steady state, native == Beetle on ALL 12 ruler #2 loops: the 4 divergences closed (gte_rtps 18->14, gte_nclip 11->7, gte_read_use 19->14, ld_div 45->49); the 8 CPU-load/alu/div/mult loops held. Ruler #1 delta 0. Tomba 2 FMV plays (no regression). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>