Propeller Manual

TEST – Assembly Language Reference
TEST
Instruction: Bitwise AND two values to affect flags only.
TEST Value1, 〈#〉 Value2
Result: Optionally, zero-result and parity of result is written to the Z and C flags.
•
Value1 (d-field) is the register containing the value to bitwise AND with Value2.
•
Value2 (s-field) is a register or a 9-bit literal whose value is bitwise ANDed with
Value1.
Opcode Table:
–INSTR– ZCRI –CON– –DEST– –SRC– Z Result C Result Result Clocks
011000 000i 1111 ddddddddd sssssssss
D = 0 Parity of Result Not Written 4
Concise Truth Table:
In Out
Destination Source Z C Effects Destination
1
Z C
$0000_000A; 10 $0000_0005; 5 - -
wr wz wc
$0000_0000; 0 1 0
$0000_000A; 10 $0000_0007; 7 - -
wr wz wc
$0000_0002; 2 0 1
$0000_000A; 10 $0000_000F; 15 - -
wr wz wc
$0000_000A; 10 0 0
1
Destination is not written unless the WR effect is given. NOTE: the TEST instruction with a WR effect is an AND instruction.
Explanation
TEST is similar to AND except it doesn’t write a result to Value1; it performs a bitwise AND of
the values in Value1 and Value2 and optionally stores the zero-result and parity of the result
in the Z and C flags.
If the WZ effect is specified, the Z flag is set (1) if Value1 AND Value2 equals zero. If the WC
effect is specified, the C flag is set (1) if the result contains an odd number of high (1) bits.
Page 362 · Propeller Manual v1.1