CSC263 Computer Org & Arch I - Answers: Bitwise Operations and Shifting Homework

Homework Answers: Bitwise Operations and Shifting

1110 0101 1000
0010 1111 0101
0000 1110 0101
1111 0010 0101
1011 1110 0110
0001 1000 0100
The bit pattern (in hex) is the immediate operand. To load this bit pattern it must be ORed with zero. Register $0 (also called $zero) always contains zero, so $0 will be the second operand. The first operand will be the register that will contain the bit string. For example, the following instruction loads the bit string 0011 1010 into $t1:
```
          ori     $t1, $0, 0x3a
```
binary: 0000 0000 0000 0010 hex: 00 02

          li      $t1, 0x02   #  or  ori     $t1, $0, 0x02
          or      $t2, $t2, $t1

binary: 1111 1111 1111 1101 hex: FF FD

          li      $t1, 0xFFFD   #  or  ori     $t1, $0, 0xFFFD
          and     $t2, $t2, $t1

binary: 0000 0000 0100 1100 hex: 00 4C

          li      $t1, 0004C   #  or  ori     $t1, $0, 0x004C
          or      $t2, $t2, $t1

binary: 1111 1111 1011 0011 hex: FF B3

          li      $t1, 0xFFB3   #  or  ori     $t1, $0, 0xFFB3
          and     $t2, $t2, $t1

          ori     $t1,$0,0x02
          sll     $t2, $t1, 1
          sll     $t3, $t2, 1
          sll     $t4, $t3, 1

          ori     $t1, $0, 0x01
          sll     $t2, $t1, 1
          or      $t1, $t1, $t2
          sll     $t2, $t1, 2
          or      $t1, $t1, $t2
          sll     $t2, $t1, 4
          or      $t1, $t1, $t2
          sll     $t2, $t1, 8
          or      $t1, $t1, $t2
          sll     $t2, $t1, 16
          or      $t1, $t1, $t2