ROR
Instruction: Rotate value right by specified number of bits.
ROR Value, < # > Bits
Result: Value is rotated right by Bits.
- Value (d-field) is the register to rotate right.
- Bits (s-field) is a register or a 5-bit literal whose value is the number of bits to rotate right.
Opcode Table:
–INSTR– ZCRI –CON– –DEST– –SRC– | Z Result | C Result | Result | Clocks |
001000 001i 1111 ddddddddd sssssssss | Result = 0 | D[0] | Written | 4 |
Concise Truth Table:
In | Out | ||||||
Destination | Source | Z | C | Effects | Destination | Z | C |
$0000_0000; 0 | $0000_0001; 1 | - | - | wz wc | $0000_0000; 0 | 1 | 0 |
$1234_5678; 305,419,896 | $0000_0004; 4 | - | - | wz wc | $8123_4567; -2,128,394,905 | 0 | 0 |
$8123_4567; -2,128,394,905 | $0000_000C; 12 | - | - | wz wc | $5678_1234; 1,450,709,556 | 0 | 1 |
$5678_1234; 1,450,709,556 | $0000_0010; 16 | - | - | wz wc | $1234_5678; 305,419,896 | 0 | 0 |
Explanation
ROR (Rotate Right) rotates Value right, Bits times. The LSBs rotated out of Value are rotated into its MSBs.
If the WZ effect is specified, the Z flag is set (1) if the resulting Value equals zero. If the WC effect is specified, at the end of the operation, the C flag is set equal to Value's original bit 0. The result is written to Value unless the NR effect is specified.
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