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https://github.com/Druthulu/BFM-decomp
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Drew T
ba35785ec4
- MATCH (59 ins), real-TU verified by the agent before handing back (cc1 rc=0, 59/59, 0 diffs). - Propagated x138 with ZERO exclusions -> confirms the ×3 cap on func_80174CB0 was purely the carried-extern collision: a body with no externs propagates clean. - R22 clean-fleet 140/140, 0 failed. dedup-check 1884 validated / 0 failed, C1 coverage complete. - FLEET CROSSES 80.0% instr-weighted (10,509,526 / 13,141,652); fn-count 89.02%; distinct 67.7%. - THE LEVER (cookbook §70): residual was ONE instruction, addiu $t0,$t1,0xC vs $t0,$a0,0xC -- a giv based on a copy of the param. Reading gcc-2.7.2 loop.c/cse.c proved the natural form can never emit the target: cse.c:make_regs_eqv makes the copy canonical (it out-lives a0) and loop.c:update_reg_last_use won't extend a0's last-use (giv-init UID >= max_uid_for_loop). Fix: walk the PARAMETER itself, so record_initial sees the biv init as hard reg (reg:SI 4), valid_initial_value_p accepts it (precondition: no calls), and emit_iv_add_mult bases the giv on $a0 -- yielding both required instructions free. - META: this compiler-source reasoning was done by an ORDINARY Opus 5 drafting agent, unprompted -- the tier Phase 23 reserved for Fable5. One data point, recorded as such; the cheap action is to give routine drafting agents the gcc source path.