Move Unit Right+/Left-

called by certain sprite animation commands. r5 is the input byte. (knockback animation stuff?)
000846b0: 94820070 lhu r2,0x0070(r4)		Load Current Facing?
000846b4: 00000000 nop
000846b8: 30430c00 andi r3,r2,0x0c00		Get Facing
000846bc: 34020400 ori r2,r0,0x0400
000846c0: 10620019 beq r3,r2,0x00084728		Branch if Facing = West
000846c4: 28620401 slti r2,r3,0x0401
000846c8: 10400005 beq r2,r0,0x000846e0		Branch if Facing < 0x401
000846cc: 00000000 nop
000846d0: 10600010 beq r3,r0,0x00084714		Branch if Facing = South
000846d4: 00051600 sll r2,r5,0x18
000846d8: 080211d4 j 0x00084750
000846dc: 00000000 nop
000846e0: 34020800 ori r2,r0,0x0800
000846e4: 10620005 beq r3,r2,0x000846fc		Branch if Facing = North
000846e8: 34020c00 ori r2,r0,0x0c00
000846ec: 10620014 beq r3,r2,0x00084740		Branch if Facing = East
000846f0: 00051600 sll r2,r5,0x18
000846f4: 080211d4 j 0x00084750
000846f8: 00000000 nop

• North*

000846fc: 00051600 sll r2,r5,0x18
00084700: 94830050 lhu r3,0x0050(r4)		Load X ?
00084704: 00021603 sra r2,r2,0x18
00084708: 00431021 addu r2,r2,r3
0008470c: 080211d4 j 0x00084750                Jump to end
00084710: a4820050 sh r2,0x0050(r4)		Save input + X as new X? 

• South*

00084714: 94830050 lhu r3,0x0050(r4)
00084718: 00021603 sra r2,r2,0x18
0008471c: 00621823 subu r3,r3,r2
00084720: 080211d4 j 0x00084750                Jump to end
00084724: a4830050 sh r3,0x0050(r4)		save X - Input as new X?

• West*

00084728: 00051600 sll r2,r5,0x18
0008472c: 94830054 lhu r3,0x0054(r4)		Load Y ?
00084730: 00021603 sra r2,r2,0x18
00084734: 00431021 addu r2,r2,r3
00084738: 080211d4 j 0x00084750                Jump to end
0008473c: a4820054 sh r2,0x0054(r4)		Save Y + Input as new Y?

• East*

00084740: 94830054 lhu r3,0x0054(r4)
00084744: 00021603 sra r2,r2,0x18
00084748: 00621823 subu r3,r3,r2
0008474c: a4830054 sh r3,0x0054(r4)		Save Y - input as new Y?
00084750: 03e00008 jr r31
00084754: 00000000 nop