Contiguous load of bytes to 8-bit element ZA tile slice
This instruction performs a contiguous load of bytes to an 8-bit element ZA tile slice. The slice number within the tile is selected by the sum of the slice index register and immediate offset, modulo the number of 8-bit elements in a vector. The immediate offset is in the range 0 to 15. The memory address is generated by a 64-bit scalar base and an optional 64-bit scalar offset that is added to the base address. Inactive elements will not cause a read from Device memory or signal a fault, and are set to zero in the destination vector.
| 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 |
| 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Rm | V | Rs | Pg | Rn | 0 | off4 | ||||||||||||||
| msz | |||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SME) then EndOfDecode(Decode_UNDEF); end; let n : integer = UInt(Rn); let m : integer = UInt(Rm); let g : integer = UInt('0'::Pg); let s : integer = UInt('011'::Rs); let t : integer = 0; let offset : integer = UInt(off4); let esize : integer{} = 8; let vertical : boolean = V == '1';
| <HV> |
Is the horizontal or vertical slice indicator,
encoded in
|
| <Ws> |
Is the 32-bit name of the slice index register W12-W15, encoded in the "Rs" field. |
| <offs> |
Is the slice index offset, in the range 0 to 15, encoded in the "off4" field. |
| <Pg> |
Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field. |
| <Xn|SP> |
Is the 64-bit name of the general-purpose base register or stack pointer, encoded in the "Rn" field. |
| <Xm> |
Is the optional 64-bit name of the general-purpose offset register, defaulting to XZR, encoded in the "Rm" field. |
CheckStreamingSVEAndZAEnabled(); let VL : integer{} = CurrentVL(); let PL : integer{} = VL DIV 8; let dim : integer = VL DIV esize; var base : bits(64); var addr : bits(64); let mask : bits(PL) = P{}(g); var moffs : bits(64) = X{}(m); let index : bits(32) = X{}(s); let slice : integer = (UInt(index) + offset) MOD dim; var result : bits(VL); let mbytes : integer{} = esize DIV 8; let contiguous : boolean = TRUE; let nontemporal : boolean = FALSE; let tagchecked : boolean = TRUE; let accdesc : AccessDescriptor = CreateAccDescSME(MemOp_LOAD, nontemporal, contiguous, tagchecked); if n == 31 then if (AnyActiveElement{PL}(mask, esize) || ConstrainUnpredictableBool(Unpredictable_CHECKSPNONEACTIVE)) then CheckSPAlignment(); end; base = SP{64}(); else base = X{64}(n); end; for e = 0 to dim - 1 do addr = AddressAdd(base, UInt(moffs) * mbytes, accdesc); if ActivePredicateElement{PL}(mask, e, esize) then result[e*:esize] = Mem{esize}(addr, accdesc); else result[e*:esize] = Zeros{esize}; end; moffs = moffs + 1; end; ZAslice{VL}(t, esize, vertical, slice) = result;
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
2026-03_rel 2026-03-26 20:48:11
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