Ghidra Setup
https://github.com/NationalSecurityAgency/ghidra/issues/325#issuecomment-565208276
Start by right-clicking anywhere in the listing view and selecting Set Register Values
Set r2 to 0x803d4980 (Repeat this process for r13 and 0x803d2900
Navigate to Window -> Register Managerand adjust the start and end addresses as shown below.
quantize() decompiling, etc.:
https://wiibrew.org/wiki/Paired_single#psq_st