Example Program

31....26	25...21	20...16	15...................0
0xD	s	d	unsigned const

Here are the fields of the ori instruction. The numbers in the first row are bit positions, numbered from the low-order bit on the right. The opcode of the instruction is 0xD. Since the opcode is six bits wide this is understood to stand for 001101. The source register is s, the destination register is d, and the immediate operand is const.

Our example program will assemble the machine code that corresponds to the assembly language instruction:

ori  $8,$9,0x004A

The instruction will be assembled in register $25 . The program uses bitwise logic and shift operations. Let us say that this example is part of a larger program. To start out, initialize $25 to all zeros (this is called clearing the register).