PowerPC 32bits

reg = R0-R31
#imm = a value you set 

Bit expain 
0 = mean bit is zero
1 = mean bit is set
2 = mean this bit can be 0 or 1

opcode                                     Name 	Desciptions							
0010 0000 0000 0000 1000 0000 0100 1110    blr		return from a functions

0222 2222 2222 2222 2222 2222 0011 1000    Li reg,#imm  move a value to a register





Here how the primary opcode work 
xxxx xxxx xxxx xxxx DDDS SSSS 3333 33DD	  
   

3 = it is the primary opcode
D = Destions register
S = Source reigters   
                                                                        opcode
                                                           ------------------------
                                                           |bit order:  0123 45   67|
     -------   -------                                      -----------         ----                                                                        
34: | 0c 00 | | e1 93 | stw r31,12(r1) 0000 1100 0000 0000 1110 0001 | 1001 00 | 00
38: | 14 00 | | 01 90 | stw r0,20(r1)  0001 0100 0000 0000 0000 0001 | 1001 00 | 11
     -------   -------                                                ---------  
        |         |
        |         |--> Get source register R0-R31 (0xE1 & 0x1F) = 1
        |         |
        |         |--> Get Dest register R0-R31 ((0xE1 & 0xE0)>>5) | ((0x90 & 0x3)<<3)  = 31 or 0      
        |         |     (The adding the two last bit on the end is maybe wrong need examine it)
        |         |
        |          --> Get the opcpde (0x90 & 0xFC)
       \ /        
                   
 The address offset 12 or 20
                                     
 ---------------------------------------------------------
|bit order: pos   1111 1111 1111 1111 0000 0000 0000 0000 |
|	          89AB CDEF 0123 4567 89AB CDEF 0123 4567 |            	
|---------------------------------------------------------|
|           bits  0000 1100 0000 0000 1110 0001 1001 0000 |
 ---------------------------------------------------------