psxrecomp

mirror of https://github.com/RetroPortingToolKit/psxrecomp synced 2026-10-26 02:11:36 -04:00

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Matthew Stanley b00b81f5e9 feat(timing): single-source cycle-cost seam (psx_instr_base_cycles), identity

P3 step 1 (FAITHFUL_TIMING_PLAN.md): both backends now account guest CPU cycles
through ONE function, runtime/include/psx_instr_cost.h::psx_instr_base_cycles(insn),
so they can never disagree (the -8 drift class). Interp routes its 3 per-insn
charges (exec_delay_slot, dirty dispatch loop, precise slice) through it; the
recompiler sums it over each block (+ the outside delay-slot clone) to fold into
the compile-time block charge. Stage 1 = identity (1 cycle/insn) = the proven
baseline, so the seam is BEHAVIOR-PRESERVING: regen is byte-identical (verified,
full.c + dispatch.c) and Tomba 2 still reaches the intro FMV (i_stat 0x8D
streaming). Stage 2 edits ONLY psx_instr_base_cycles (transcribe real R3000A
costs from in-tree Beetle cpu.cpp/gte.cpp + psx-spx, verify each vs Beetle) and
both backends update together.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-26 19:20:20 -07:00

include

feat(timing): single-source cycle-cost seam (psx_instr_base_cycles), identity

2026-06-26 19:20:20 -07:00

launcher

feat(launcher): [controller] lock_mode — hide pad-mode selector, force one mode

2026-06-25 23:16:17 -07:00

shaders

vulkan: 3rd renderer backend (WIP) — emitter, GPU-direct present, full-frame readback

2026-06-18 14:56:12 -07:00

src

feat(timing): single-source cycle-cost seam (psx_instr_base_cycles), identity