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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
(Armv8.4)

313029282726252423222120191817161514131211109876543210
00111010000000000sz0010Rn01101
sf

SETF8 (sz == 0)

SETF8 <Wn>

SETF16 (sz == 1)

SETF16 <Wn>

if !HaveFlagManipulateExt() then UNDEFINED; integer msb = if sz == '1' then 15 else 7; () || sf != '0' then UNDEFINED; integer msb = if sz=='1' then 15 else 7; 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]; PSTATE.N = tmpreg<msb>; PSTATE.Z = if (tmpreg<msb:0> == Zeros(msb + 1)) then '1' else '0'; (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: isa v30.41, AdvSIMD v27.08, pseudocode r8p5_00bet2_rc5, sve v8.5-00bet10_rc5 ; Build timestamp: 2019-03-28T072019-03-28T06:1434

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