ReaperOfVeriod
91b09955c8
391 candidates on correct bytes, 73 under 16 immediates. The densest, 0x2dca20,
164 bytes with three distinct immediates, disassembles through tools/overlay-anchors
as:
xori.b $w0, $w0, 0xa2
ext $v0, $s0, 0, 1
addu $a2, $v0, $a2
xori.b and ext are VU1 mnemonics and three-operand addu is not MIPS32. Capstone is
decoding COP2: 0x2dca20 is VU microcode. Same answer 0x2ee138 gave.
That calls the frequency result into question more seriously than the displacement
did. The measurement filtered on opcodes excluding COP2, so VU cannot explain the
391 counts directly -- but the function extents come from the decomp's CPU
analysis, and if an extent spans a VU region the window scanned is mixed and the
immediate set attributed to that function is not a function's.
Status: the enrichment is real as a measurement of those windows; what the windows
are is now doubtful.
Next: verify decomp extents land on CPU code before trusting any of them -- decode
a sample and require a plausible prologue. Same shape as the cd16485 check, and the
fourth time a 'real shortlist' has needed one more verification first.
286 passing with the disc present, clippy clean.