Set condition flags for predicate
This instruction sets the First (N), None (Z), and !Last (C) condition flags based on the predicate source register, and sets the V flag to zero.
| 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 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | Pg | 0 | Pn | 0 | 0 | 0 | 0 | 0 | ||||||
| op | S | opc2 | |||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then EndOfDecode(Decode_UNDEF); end; let esize : integer{} = 8; let g : integer = UInt(Pg); let n : integer = UInt(Pn);
| <Pg> |
Is the name of the governing scalable predicate register, encoded in the "Pg" field. |
| <Pn> |
Is the name of the source scalable predicate register, encoded in the "Pn" field. |
CheckSVEEnabled(); let VL : integer{} = CurrentVL(); let PL : integer{} = VL DIV 8; let mask : bits(PL) = P{}(g); let result : bits(PL) = P{}(n); PSTATE.[N,Z,C,V] = PredTest{PL}(mask, result, esize);
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
If FEAT_SME is implemented and the PE is in Streaming SVE mode, then any subsequent instruction that is dependent on the predicate register written by this instruction might be significantly delayed.
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