Propeller Manual

3: Assembly Language Reference – RCL
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– ZCRI –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.
Propeller Manual v1.1 · Page 333