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Drew T
6bb3d240fa
HARVEST — the s67o1/s67m1 wave banked 7 cookbook sections:
* §325 a shared small constant stored twice in the pre-loop block is a LOCAL-ALLOC $s-occupant that
steals the argument allocno's register — pin the ARGUMENT-derived local, not the constant
(pinning the constant reached only closeness 15). byte-proven func_80184F18.
* §326 spelling two reads of the same halfword differently (sym[i] vs *(s16*)(base+i*4+2)) yields
different address rtx and DEFEATS address-CSE, restoring separate %hi/%lo groups. func_8017FAAC.
* §327 a range test must be HImode: with s32 + a (u16) cast gcc PROVES the mask redundant and drops
the andi — a real -1 length drift that reads as a schedule. +3 levers. func_8017EC34.
* §328 NEW LAW: the volatile alias must be an aliased OBJECT; `*(volatile s32*)&sym` unfolds %lo
into a separate addiu (+1 ins). func_80181B8C.
* §329 fold-const narrows `(int)s16 & 0xFFF` onto the RAW HImode pseudo, breaking the
sign-extend/mask register tie; a zero-byte `s32 e = t;` widening temp restores it (30 rows -> 0).
* §330 the NEIGHBOUR-SHAPE lever, four independent instances in one wave — copy an already-banked
in-TU function's SPELLING before any codegen reasoning (one dissolved 18 REGALLOC-PERM rows in a
single compile). Corollary: a warm start from another binary is often worth LESS than the
neighbour 20 lines away.
* §331 OPEN GAP, recorded as unsolved: no lever eliminates an UNWANTED DUPLICATE copy at a
branch-target block head (main/func_80013154, closeness 12, ~16 iterations, 5 approaches refuted).
TOOLIFY — tools/gate_wave.py: split the batch on the per-draft jtbl predicate, run parallel_gate
and the serial jtbl lane CONCURRENTLY. Measured this session: 4 binaries in 103s wall through
parallel_gate (87/87/88/102s each) vs ~6 min serially; I had gated all 16 serially to protect ONE
jtbl draft, ~1 hour. The split precedes the run because a jtbl worker does NOT fail cleanly — it
re-extracts through the worktree's asm/ symlink and writes the MAIN tree while other workers read it.
Its own negative control found two defects in it before first use:
* listdir counted gate_stage's _xform output dirs (-cn/-cast/-rc/-sd, written as SIBLINGS inside
the drafts root) as binaries: 20 "binaries" for a 16-binary wave. Now validated against
progress.BINARIES and refused loudly (R32/R43).
* a post-hoc control over BANKED functions cannot reproduce a split (has_jtbl has no stub to read);
re-controlled against a live draft set, where it correctly routes the two functions the gate had
independently reported CARVE-REFUSED.