Bitwise OR (immediate) performs a bitwise (inclusive) OR of a register value and an immediate register value, and writes the result to the destination register.
This instruction is used by the alias MOV (bitmask immediate).
| 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 | 1 | 0 | 0 | 1 | 0 | 0 | N | immr | imms | Rn | Rd | ||||||||||||||||||
| opc | |||||||||||||||||||||||||||||||
integer d = UInt(Rd); integer n = UInt(Rn); integer datasize = if sf == '1' then 64 else 32; boolean setflags; LogicalOp op; case opc of when '00' op = LogicalOp_AND; setflags = FALSE; when '01' op = LogicalOp_ORR; setflags = FALSE; when '10' op = LogicalOp_EOR; setflags = FALSE; when '11' op = LogicalOp_AND; setflags = TRUE; bits(datasize) imm; if sf == '0' && N != '0' then UNDEFINED; (imm, -) = DecodeBitMasks(N, imms, immr, TRUE);
| <Wd|WSP> |
Is the 32-bit name of the destination general-purpose register or stack pointer, encoded in the "Rd" field. |
| <Wn> |
Is the 32-bit name of the general-purpose source register, encoded in the "Rn" field. |
| <Xd|SP> |
Is the 64-bit name of the destination general-purpose register or stack pointer, encoded in the "Rd" field. |
| <Xn> |
Is the 64-bit name of the general-purpose source register, encoded in the "Rn" field. |
| <imm> |
For the 32-bit variant: is the bitmask immediate, encoded in "imms:immr". |
|
For the 64-bit variant: is the bitmask immediate, encoded in "N:imms:immr". |
| Alias | Is preferred when |
|---|---|
| MOV (bitmask immediate) | Rn == '11111' && ! MoveWidePreferred(sf, N, imms, immr) |
bits(datasize) result; bits(datasize) operand1 = X[n]; bits(datasize) operand2 = imm; case op of when LogicalOp_AND result = operand1 AND operand2; when LogicalOp_ORR result = operand1 OR operand2; when LogicalOp_EOR result = operand1 EOR operand2; if setflags then PSTATE.<N,Z,C,V> = result<datasize-1>:IsZeroBit(result):'00'; if d == 31 && !setflags then SP[] = result; else X[d] = result;
If PSTATE.DIT is 1:
Internal version only: isa v33.11seprel, AdvSIMD v29.05, pseudocode v2021-09_rel, sve v2021-09_rc3d ; Build timestamp: 2021-10-06T11:41
Copyright © 2010-2021 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.