Multiply Rotation Matrix r4 by Input Vector r5

r4 = 3x3 rotation matrix R
r5 = input matrix (x, y, z)

0001c9e0: 8c880000 lw r8,0x0000(r4)			R11 & R21
0001c9e4: 8cab0000 lw r11,0x0000(r5)			x
0001c9e8: 3109ffff andi r9,r8,0xffff			R11
0001c9ec: 00094c00 sll r9,r9,0x10
0001c9f0: 00094c03 sra r9,r9,0x10
0001c9f4: 012b0019 multu r9,r11			R11 * x?
0001c9f8: 00085403 sra r10,r8,0x10			r10 = R21
0001c9fc: 8cac0004 lw r12,0x0004(r5)			y
0001ca00: 8cad0008 lw r13,0x0008(r5)			z
0001ca04: 8c880004 lw r8,0x0004(r4)			R31 & R12
0001ca08: 00801021 addu r2,r4,r0
0001ca0c: 00004812 mflo r9
0001ca10: 00094b03 sra r9,r9,0x0c			divide by 4096, this is just because cos of an angle can't be stored with decimal places.
0001ca14: 3129ffff andi r9,r9,0xffff
0001ca18: 014b0019 multu r10,r11			R21 * x
0001ca1c: 00005012 mflo r10
0001ca20: 000a5303 sra r10,r10,0x0c			R21 * x proper
0001ca24: 000a5400 sll r10,r10,0x10
0001ca28: 012a4825 or r9,r9,r10			[(R11 * x, R21 * x)]
0001ca2c: ac890000 sw r9,0x0000(r4)			store new R11 and R21 values
0001ca30: 3109ffff andi r9,r8,0xffff			R31
0001ca34: 00094c00 sll r9,r9,0x10
0001ca38: 00094c03 sra r9,r9,0x10
0001ca3c: 012b0019 multu r9,r11			R31 * x
0001ca40: 00085403 sra r10,r8,0x10			R12
0001ca44: 8c880008 lw r8,0x0008(r4)			R22 & R23
0001ca48: 00004812 mflo r9
0001ca4c: 00094b03 sra r9,r9,0x0c			R31 * x proper
0001ca50: 3129ffff andi r9,r9,0xffff
0001ca54: 014c0019 multu r10,r12			R12 * y
0001ca58: 00005012 mflo r10
0001ca5c: 000a5303 sra r10,r10,0x0c			R12 * y proper
0001ca60: 000a5400 sll r10,r10,0x10
0001ca64: 012a4825 or r9,r9,r10			[(R31 * x),(R12 * y)]
0001ca68: ac890004 sw r9,0x0004(r4)			Store new Matrix R31 and R12
0001ca6c: 3109ffff andi r9,r8,0xffff			R22
0001ca70: 00094c00 sll r9,r9,0x10
0001ca74: 00094c03 sra r9,r9,0x10
0001ca78: 012c0019 multu r9,r12			R22 * y
0001ca7c: 00085403 sra r10,r8,0x10			R23
0001ca80: 8c88000c lw r8,0x000c(r4)			R31 & R32
0001ca84: 00004812 mflo r9
0001ca88: 00094b03 sra r9,r9,0x0c
0001ca8c: 3129ffff andi r9,r9,0xffff
0001ca90: 014c0019 multu r10,r12			R23 * y
0001ca94: 00005012 mflo r10
0001ca98: 000a5303 sra r10,r10,0x0c
0001ca9c: 000a5400 sll r10,r10,0x10
0001caa0: 012a4825 or r9,r9,r10			[(R22 * y, R23 * y)]
0001caa4: ac890008 sw r9,0x0008(r4)			Store new matrix R22 and R23
0001caa8: 3109ffff andi r9,r8,0xffff			R31
0001caac: 00094c00 sll r9,r9,0x10
0001cab0: 00094c03 sra r9,r9,0x10
0001cab4: 012d0019 multu r9,r13			R31 * z
0001cab8: 00085403 sra r10,r8,0x10			R32
0001cabc: 8c880010 lw r8,0x0010(r4)			R33 & null
0001cac0: 00004812 mflo r9
0001cac4: 00094b03 sra r9,r9,0x0c			R31 * z proper
0001cac8: 3129ffff andi r9,r9,0xffff
0001cacc: 014d0019 multu r10,r13
0001cad0: 00005012 mflo r10
0001cad4: 000a5303 sra r10,r10,0x0c			R32 * z proper
0001cad8: 000a5400 sll r10,r10,0x10
0001cadc: 012a4825 or r9,r9,r10			[(R31 * z, R32 * z)]
0001cae0: ac89000c sw r9,0x000c(r4)			Store new R31 and R32
0001cae4: 3109ffff andi r9,r8,0xffff			R33
0001cae8: 00094c00 sll r9,r9,0x10
0001caec: 00094c03 sra r9,r9,0x10
0001caf0: 012d0019 multu r9,r13			R33 * z
0001caf4: 00004812 mflo r9
0001caf8: 00094b03 sra r9,r9,0x0c			[(R33 * z)]
0001cafc: 03e00008 jr r31
0001cb00: ac890010 sw r9,0x0010(r4)			Store new R33