Index

ORN (shifted register)

Bitwise OR NOT (shifted register) performs a bitwise (inclusive) OR of a register value and the complement of an optionally-shifted register value, and writes the result to the destination register.

This instruction is used by the alias MVN.

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
sf 0 1 0 1 0 1 0 shift 1 Rm imm6 Rn Rd
opc N

32-bit (sf == 0)

ORN <Wd>, <Wn>, <Wm>{, <shift> #<amount>}

64-bit (sf == 1)

ORN <Xd>, <Xn>, <Xm>{, <shift> #<amount>}

integer d = UInt(Rd);
integer n = UInt(Rn);
integer m = UInt(Rm);
constant integer datasize = 32 << UInt(sf);
if sf == '0' && imm6<5> == '1' then UNDEFINED;

ShiftType shift_type = DecodeShift(shift);
integer shift_amount = UInt(imm6);

Assembler Symbols

<Wd>

Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field.
<Wn>

Is the 32-bit name of the first general-purpose source register, encoded in the "Rn" field.
<Wm>

Is the 32-bit name of the second general-purpose source register, encoded in the "Rm" field.
<Xd>

Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field.
<Xn>

Is the 64-bit name of the first general-purpose source register, encoded in the "Rn" field.
<Xm>

Is the 64-bit name of the second general-purpose source register, encoded in the "Rm" field.
<shift>

Is the optional shift to be applied to the final source, defaulting to LSL and encoded in shift:

shift <shift>
00 LSL
01 LSR
10 ASR
11 ROR
<amount>

For the 32-bit variant: is the shift amount, in the range 0 to 31, defaulting to 0 and encoded in the "imm6" field.

For the 64-bit variant: is the shift amount, in the range 0 to 63, defaulting to 0 and encoded in the "imm6" field,

Alias Conditions

Alias Is preferred when
MVN Rn == '11111'

Operation

bits(datasize) operand1 = X[n, datasize];
bits(datasize) operand2 = ShiftReg(m, shift_type, shift_amount, datasize);
bits(datasize) result;

operand2 = NOT(operand2);

result = operand1 OR operand2;
X[d, datasize] = result;

Operational information

If PSTATE.DIT is 1: