SHR
Instruction: Shift value right by specified number of bits.
SHR Value, < # > Bits
Result: Value is shifted right by Bits.
- Value (d-field) is the register to shift right.
- Bits (s-field) is a register or a 5-bit literal whose value is the number of bits to shift right.
Opcode Table:
–INSTR– ZCRI –CON– –DEST– –SRC– | Z Result | C Result | Result | Clocks |
001010 001i 1111 ddddddddd sssssssss | Result = 0 | D[0] | Written | 4 |
Concise Truth Table:
In | Out | ||||||
Destination | Source | Z | C | Effects | Destination | Z | C |
$1234_5678; 305,419,896 | $0000_0004; 4 | - | - | wz wc | $0123_4567; 19,088,743 | 0 | 0 |
$0123_4567; 19,088,743 | $0000_000C; 12 | - | - | wz wc | $0000_1234; 4,660 | 0 | 1 |
$0000_1234; 4,660 | $0000_0010; 16 | - | - | wz wc | $0000_0000; 0 | 1 | 0 |
Explanation
SHR (Shift Right) shifts Value right by Bits places and sets the new MSBs to 0.
If the WZ effect is specified, the Z flag is set (1) if the resulting Value equals zero. If the WC effect is specified, 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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