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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)
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 |
0 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | sz | 0 | 0 | 1 | 0 | Rn | 0 | 1 | 1 | 0 | 1 | ||||
sf |
SETF8 (sz == 0)
SETF8 <Wn>
SETF16 (sz == 1)
SETF16 <Wn>
if !HaveFlagManipulateExt() then UNDEFINED; integer msb = if sz == '1' then 15 else 7; integer n = UInt(Rn);
Assembler Symbols
Operation
bits(32) tmpreg = X[n]; 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:
- The execution time of this instruction is independent of:
- The values of the data supplied in any of its registers.
- The values of the NZCV flags.
- The response of this instruction to asynchronous exceptions does not vary based on:
- The values of the data supplied in any of its registers.
- The values of the NZCV flags.