It's supposed to check the next instruction, which is PC, rather than
the current instruction which is CompilePC. This mistake is what caused
graphical errors in RE2.
Instruction Reordering broke Mia Hamm and possibly other games too. The
easiest way to fix the problem was to simply disable reordering for
specific cases that were never accounted for.
Not only were certain instructions missing, but also some were in the
wrong place or had the wrong attributes.
Also VSUB needed to be added to IsNextInstructionMmx.
I have only seen the edgecase for SQV happen when
IsRegConst(RSPOpC.base) == TRUE. Changing SQV fixed Telefoot / Mia Ham.
I optimized VAND, for games like Kirby64.
The possibility of the RSP instruction at address 0xFFC being JR was
never accounted for. This fixes Wave Race and Star Wars - Shadow of the
Empire.
The accumulator analysis was wrong, which broke games like Mario No
Photopie.
LegendOfDragoon