First real attribution (in-process 1 kHz IP sampler, 75k samples at
oc900, play build). Top sinks and their fixes:
- tex_pack_on_textured_prim (7.4%): per-prim mutex + CLUT hash + linear
scan over up to 8192 uploads — entirely matched-set/dump census, a
debug/authoring surface with no reader in play builds (substitution
lives in tex_pack_lookup_replacement). Gated out of play builds
unless dumping. Confirmed gone in the follow-up profile.
- text_xlate_on_dispatch (4.2% -> 0.8%): the a0..a3 record scan serves
capture (off in release) and STRING substitution; a fixes-only load
(vram patches / glyph labels) has an empty string table, so the scan
could never act. Early-out on empty table; the throttled patch blocks
still run.
- psx_pgxp_alu/muldiv (3.6%): ALU/MULDIV shadows feed only tier-2
cpu_mode and the correction consumers' chains; the exact-sign NCLIP
arm is LOAD/STORE/COP2 only. Hook bodies now gate on
(cpu_mode || full_hooks) — full_hooks maintained by
gpu_pgxp_rederive_enable — and the remaining per-instruction CALL
cost is removed by an inline g_pgxp_alu_armed check in the
PGXP_ALU/PGXP_MULDIV macros themselves. Correctness: a stale shadow
from the gated period is dropped by pv_validate at every consumer
(the engine's single safety invariant, verified at the MTC2 path).
Measured effect of the round at oc900 (before the macro gate):
sustained 0.73-0.80x -> 0.87-0.91x; streaming-window dip 0.35 -> 0.50;
post-window touching 1.00x. Fresh profile after: xlate and tex_pack
prim hook out of the top-15.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
tetrisgm
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