Propeller Manual

3: Assembly Language Reference – MUXNZ
MUXNZ
Instruction: Set discrete bits of a value to the state of !Z.
MUXNZ Destination, 〈#〉 Mask
Result: Destination’s bits, indicated by Mask, are set to the state of !Z.
•
Destination (d-field) is the register whose bits described by Mask are affected by !Z.
•
Mask (s-field) is a register or a 9-bit literal whose value contains high (1) bits for
every bit in Destination to set to the inverse of the Z flag’s state.
Opcode Table:
–INSTR– ZCRI –CON– –DEST– –SRC– Z Result C Result Result Clocks
011111 001i 1111 ddddddddd sssssssss
Result = 0 Parity of Result Written 4
Concise Truth Table:
In Out
Destination Source Z C Effects Destination Z C
$0000_0000; 0 $0000_0001; 1 0 -
wz wc
$0000_0001; 1 0 1
$0000_0000; 0 $0000_0001; 1 1 -
wz wc
$0000_0000; 0 1 0
$0000_0000; 0 $0000_0003; 3 0 -
wz wc
$0000_0003; 3 0 0
$0000_0000; 0 $0000_0003; 3 1 -
wz wc
$0000_0000; 0 1 0
$AA55_2200; -1,437,261,312 $1234_5678; 305,419,896 0 -
wz wc
$BA75_7678; -1,166,707,080 0 1
$AA55_2200; -1,437,261,312 $1234_5678; 305,419,896 1 -
wz wc
$A841_2000; -1,472,126,976 0 0
$AA55_2200; -1,437,261,312 $FFFF_FFFF; -1 0 -
wz wc
$FFFF_FFFF; -1 0 0
$AA55_2200; -1,437,261,312 $FFFF_FFFF; -1 1 -
wz wc
$0000_0000; 0 1 0
Explanation
MUXNZ sets each bit of the value in Destination, which corresponds to Mask’s high (1) bits, to
the !Z state. All bits of Destination that are not targeted by high (1) bits of Mask are
unaffected. This instruction is handy for setting or clearing discrete bits, or groups of bits, in
an existing value.
If the
WZ effect is specified, the Z flag is set (1) if Destination’s final value is 0. If the WC
effect is specified, the C flag is set (1) if the resulting Destination contains an odd number of
high (1) bits. The result is written to Destination unless the
NR effect is specified.
Propeller Manual v1.1 · Page 317