RCL
Instruction: Rotate C left into value by specified number of bits.
RCL Value, < # > Bits
Result: Value has Bits copies of C rotated left into it.
- Value (d-field) is the register in which to rotate C leftwards.
- Bits (s-field) is a register or a 5-bit literal whose value is the number of bits of Value to rotate C leftwards into.
Opcode Table:
–INSTR– ZCR I–CON– –DEST– –SRC– | Z Result | C Result | Result | Clocks |
001101 001i 1111 ddddddddd sssssssss | Result = 0 | D[31] | Written | 4 |
Concise Truth Table:
In | Out | ||||||
Destination | Source | Z | C | Effects | Destination | Z | C |
$8000_0000; -2,147,483,648 | $0000_0000; 0 | - | x | wz wc | $8000_0000; -2,147,483,648 | 0 | 1 |
$8000_0000; -2,147,483,648 | $0000_0001; 1 | - | 0 | wz wc | $0000_0000; 0 | 1 | 1 |
$8000_0000; -2,147,483,648 | $0000_0001; 1 | - | 1 | wz wc | $0000_0001; 1 | 0 | 1 |
$2108_4048; 554,188,872 | $0000_0002; 2 | - | 0 | wz wc | $8421_0120; -2,078,211,808 | 0 | 0 |
$2108_4048; 554,188,872 | $0000_0002; 2 | - | 1 | wz wc | $8421_0123; -2,078,211,805 | 0 | 0 |
$8765_4321; -2,023,406,815 | $0000_0004; 4 | - | 0 | wz wc | $7654_3210; 1,985,229,328 | 0 | 1 |
$8765_4321; -2,023,406,815 | $0000_0004; 4 | - | 1 | wz wc | $7654_321F; 1,985,229,343 | 0 | 1 |
Explanation
RCL (Rotate Carry Left) performs a rotate left of Value, Bits times, using the C flag's original value for each of the LSBs affected.
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 31. The result is written to Value unless the NR effect is specified.
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