4a042bda53
The remaining named false-positive mode - "107 rows solve to a 64K-boundary
base, a bare addis with no addi of its own, so any scatter of displacements
votes for it" - is refuted by its own measurement.
New positive test in the tool: simulate lis/addis rD,r0,HI + addi rD,rA,N +
or rD,rA,rA forward through each row's function and ask whether the solved
base lands in the solved register.
64K-boundary bases ("low confidence") : 107 / 107 confirmed
non-zero low half ("trustworthy") : 8 / 154 confirmed
A round base is the case where the compiler needed no second instruction, so
`addis r11, r0, 0x820B` stands in the code in full. A miss on the other class
is silence (base built in the caller or loaded from memory), not refutation.
Control: every row the corpus independently validated against the disc has a
64K-boundary base - debriefing, career, save, leaderboard, the 205-name PG*
HUD roster, material slots, the S16 boss collision/frames/motions and its
loader. 13 rows over 10 functions. The dense-short-string false positives the
corpus did name (r31 = 0x8202xxxx) all sit in the "trustworthy" class.
The 0x820B0000 cluster is DUPLICATION, not error: 60 of its 82 rows are one
function emitted 60 times, exactly 491 instructions each, two instructions
differing (both global data pointers), identical 41-address string sequences.
40 resource names written into a per-copy global via sub_8217FA08 at 24-byte
strides. 38 of the 40 are disc GameResourceID values (480 distinct); rot_n001
and rou_e202 are not, and no disc GameResourceID uses the rot_ prefix.
Artefact diff 13/4, confined to the replaced section; the 261-row table and
the 64K histogram untouched; byte-identical on a second run. Fourteen other
artefacts byte-identical.
178 KiB
178 KiB