or   $25,$25,$11    # move opcode into target register

or   $25,$11,$0     # move opcode into target register

Source Register

Now move the bit pattern for the source register $9 into the correct field. Register $12 contains the pattern in its right-most bits, like in the left table. The pattern should be in bits 25...21 of register $25.

31....26	25...21	20...16	15............................0
000000	00000	00000	0000 0000 0000 1001

 

ori     $8,$9,0x004A
31....26	25...21	20...16	15...................0
0xD	s	d	unsigned const
0xD	0x9	0x8	0x004A

The same method can be used for this as for the opcode. There is a slight problem: the opcode already in $25 must not be erased.

sll   $12,$12,_____      # left shift s by _____ places
or    $25,_____,_____    # move s into target register