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Bitwise AND (immediate), setting flags, performs a bitwise AND of a register value and an immediate value, and writes the result to the destination register. It updates the condition flags based on the result.
This instruction is used by the alias TST (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 | 1 | 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;
bits(datasize) imm;
if sf == '0' && N != '0' then UNDEFINED;
(imm, -) =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> | Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field. |
<Wn> | Is the 32-bit name of the general-purpose source register, encoded in the "Rn" 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 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 |
---|---|
TST (immediate) | Rd == '11111' |
bits(datasize) result;
bits(datasize) operand1 = X[n];
bits(datasize) operand2 = imm;
result = operand1 AND imm;
PSTATE.<N,Z,C,V> = result<datasize-1>:case op of
whenLogicalOp_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):'00';[] = result;
else
X[d] = result;
If PSTATE.DIT is 1:
Internal version only: isa v30.44, AdvSIMD v27.08, pseudocode v8.5-2019-06_rc2-5-g22901f2, sve v2019-06_rc4
; Build timestamp: 2019-06-26T22:3004
Copyright © 2010-2019 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.
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