Get Square root of r4 dealing with 4096

0001c264: 00000000 nop
0001c268: 4884f000 mtc2 r4,gtedr30_lzcs
0001c26c: 00000000 nop
0001c270: 00000000 nop
0001c274: 4802f800 mfc2 r2,gtedr31_lzcr
0001c278: 24010020 addiu r1,r0,0x0020
0001c27c: 1041001d beq r2,r1,0x0001c2f4
0001c280: 00000000 nop
0001c284: 30480001 andi r8,r2,0x0001
0001c288: 240afffe addiu r10,r0,0xfffe
0001c28c: 004a5024 and r10,r2,r10
0001c290: 24090013 addiu r9,r0,0x0013
0001c294: 012a4822 sub r9,r9,r10
0001c298: 00094843 sra r9,r9,0x01
0001c29c: 214bffe8 addi r11,r10,-0x0018
0001c2a0: 05600003 bltz r11,0x0001c2b0
0001c2a4: 00000000 nop
0001c2a8: 01646004 sllv r12,r4,r11
0001c2ac: 10000003 beq r0,r0,0x0001c2bc
0001c2b0: 240b0018 addiu r11,r0,0x0018
0001c2b4: 016a5822 sub r11,r11,r10
0001c2b8: 01646007 srav r12,r4,r11
0001c2bc: 218cffc0 addi r12,r12,-0x0040
0001c2c0: 000c6040 sll r12,r12,0x01
0001c2c4: 3c0d8003 lui r13,0x8003
0001c2c8: 01ac6821 addu r13,r13,r12
0001c2cc: 85adb8b8 lh r13,-0x4748(r13)
0001c2d0: 00000000 nop
0001c2d4: 05200004 bltz r9,0x0001c2e8
0001c2d8: 00000000 nop
0001c2dc: 012d1004 sllv r2,r13,r9
0001c2e0: 03e00008 jr r31
0001c2e4: 00000000 nop