Frame Timing Related? (0x1bf38)

#   ROUTINE: FRAME TIMING RELATED? 0x1bf38
#       Something to do with frame timing?  //finds square root of input.
#       Parameters:
#           r4 = (p1) input
#       Returns: sqrt(input)

8001bf38: 4884f000 mtc2 r4,gtedr30_lzcs             #   GTE LZCS = p1                       // Leading zero count source data
8001bf3c: 00000000 nop
8001bf40: 00000000 nop
                                                    #   // From GTE notes: "Reading LZCR returns the leading 0 count of LZCS if LZCS is positive and the leading 1 count of LZCS if LZCS is negative."
8001bf44: 4802f800 mfc2 r2,gtedr31_lzcr             #   leadingZeroCount = GTE LZCR        // Leading zero count result
8001bf48: 24010020 addiu r1,r0,0x0020               #   32
8001bf4c: 10410019 beq r2,r1,0x8001bfb4             #   if (leadingZeroCount != 32) {
8001bf50: 00000000 nop
8001bf54: 30480001 andi r8,r2,0x0001                #       leadingZeroCount & 1                       // Never used....
8001bf58: 240afffe addiu r10,r0,-0x0002             #       0xfffffffe
8001bf5c: 004a5024 and r10,r2,r10                   #       evenLeadingZeroCount = leadingZeroCount & 0xfffffffe
8001bf60: 2409001f addiu r9,r0,0x001f               #       31
8001bf64: 012a4822 sub r9,r9,r10                    #       31 - evenLeadingZeroCount
8001bf68: 00094843 sra r9,r9,0x01                   #       (31 - evenLeadingZeroCount) / 2
8001bf6c: 214bffe8 addi r11,r10,-0x0018             #       evenLeadingZeroCount - 24
8001bf70: 05600003 bltz r11,0x8001bf80              #       if ((evenLeadingZeroCount - 24) > 0) {
8001bf74: 00000000 nop
8001bf78: 01646004 sllv r12,r4,r11                  #           tempValue = p1 << (evenLeadingZeroCount - 24)    
8001bf7c: 10000003 beq r0,r0,0x8001bf8c
                                                    #       } else {
8001bf80: 240b0018 addiu r11,r0,0x0018              #           24
8001bf84: 016a5822 sub r11,r11,r10                  #           24 - evenLeadingZeroCount
8001bf88: 01646007 srav r12,r4,r11                  #           tempValue = p1 << (24 - evenLeadingZeroCount)
                                                    #       }
8001bf8c: 218cffc0 addi r12,r12,-0x0040             #       tempValue - 64
8001bf90: 000c6040 sll r12,r12,0x01                 #       (tempValue - 64) * 2
8001bf94: 3c0d8003 lui r13,0x8003
8001bf98: 01ac6821 addu r13,r13,r12
8001bf9c: 85adb8b8 lh r13,-0x4748(r13)              #       squareRootMod = *(0x8002d8b8 + ((tempValue - 64) * 2))
8001bfa0: 00000000 nop
8001bfa4: 012d6804 sllv r13,r13,r9                  #       squareRootMod << ((31 - evenLeadingZeroCount) / 2)
8001bfa8: 000d1302 srl r2,r13,0x0c                  #       result = (squareRootMod << ((31 - evenLeadingZeroCount) / 2)) >> 12
8001bfac: 03e00008 jr r31                           #       return result;
8001bfb0: 00000000 nop  
                                                    #   }
8001bfb4: 03e00008 jr r31                           #   return 0;
8001bfb8: 24020000 addiu r2,r0,0x0000