SETF8, SETF16

Set the PSTATE.NZV flags based on the value in the specified general-purpose register. SETF8 treats the value as an 8 bit value, and SETF16 treats the value as an 16 bit value.

The PSTATE.C flag is not affected by these instructions.

Integer
(FEAT_FlagM)

313029282726252423222120191817161514131211109876543210
00111010000000000sz0010Rn01101
sfopSopcode2o3mask

SETF8 (sz == 0)

SETF8 <Wn>

SETF16 (sz == 1)

SETF16 <Wn>

if !IsFeatureImplemented(FEAT_FlagM) then UNDEFINED; constant integer msb = (8 << UInt(sz)) - 1; integer n = UInt(Rn);

Assembler Symbols

<Wn>

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

Operation

bits(32) tmpreg = X[n, 32]; PSTATE.N = tmpreg<msb>; PSTATE.Z = if (tmpreg<msb:0> == Zeros(msb + 1)) then '1' else '0'; PSTATE.V = tmpreg<msb+1> EOR tmpreg<msb>; //PSTATE.C unchanged;

Operational information

If PSTATE.DIT is 1:


Internal version only: aarchmrs v2023-12_rel, pseudocode v2023-12_rel, sve v2023-12_rel ; Build timestamp: 2023-12-15T16:46

Copyright © 2010-2023 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.