--- every @class/@stuck/@crack note in this translation unit ---
// @class: plumbing
// @stuck: none — signed s32 counter at 0x1C, delay-slot store is the unconditional bump
// @class: schedule
// @stuck: none — MATCH (102 ins). MATRIX(0x20:m@0,t@0x14)+SVECTOR in/out stack layout; the only
// @class: regalloc-order
// @stuck: none — MATCH (83 ins). $s3 is a dual-copy of iVar3 used only in the ==0 tail block; natural C coalesces to one $s0, so pin iVar3=$s0 and iVar3b=$s3 (different hard regs prevent gcc coalescing the copy). Also: outer+inner branch polarity inverted (if!=0 / if!=0 puts both short blocks at the tail as beqz targets); base = (int)D_801B54EC + idx*0x40 (materialize form, arg to callees).
// @class: regalloc-order
// @stuck: none — MATCH (223 ins). Giant GTE coord transform. Two levers: (1) vy = {int t=vy-0x10; t+(r&0x1f);}
