sub_8226DC80 turns out to be sub_8226DAF8's twin. Diffing them instruction by
instruction, 33 of the first 86 differ, and every difference before index 65 is a
register rename or a branch target. Both:
* resolve the route name (sub_8217FA08 -> sub_823012D8), leaving the route point in
[r31+112/120/128];
* index [phase+324] by payload+0 and require rec+100 != 0;
* copy the two 3-double vectors out of the unit record.
They part at index 65. Kind 0 calls vtable slot 60 immediately. Kind 1 instead
computes an inline point-to-point distance first -- three fsub against the route
point, fmul plus two fmadd, fsqrt -- and rejects when it exceeds f31, the same radius:
8226DDC4 fsqrt f0, f0
8226DDC8 fcmpu cr6, f0, f31
8226DDCC bc 4, gt, return-0
8226DDE8 lwz r11, 60(r11) ; then the SAME slot 60
8226DDF0 bcctrl
So both trigger kinds run the identical point-to-segment test; kind 1 only adds a
cheap early-out against the same radius, and per the drain it does not spawn.
Diffing the two functions rather than reading the second one cost one query and made
the relationship obvious -- the same move that resolved the six ISL branch handlers.
All artefacts regenerate byte-identical; documentation only.
What remains on triggers is peripheral: which unit-record fields A and B are, slot 60
past the t < 0 rejection, payload+8, and the kind-1 path in the drain.
70df1c3a1b