Contiguous load of bytes to 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 which 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<1> | msz<0> | ||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SME) then UNDEFINED; constant integer n = UInt(Rn); constant integer m = UInt(Rm); constant integer g = UInt('0':Pg); constant integer s = UInt('011':Rs); constant integer t = 0; constant integer offset = UInt(off4); constant integer esize = 8; constant boolean vertical = 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(); constant integer VL = CurrentVL; constant integer PL = VL DIV 8; constant integer dim = VL DIV esize; bits(64) base; bits(64) addr; constant bits(PL) mask = P[g, PL]; bits(64) moffs = X[m, 64]; constant bits(32) index = X[s, 32]; constant integer slice = (UInt(index) + offset) MOD dim; bits(VL) result; constant integer mbytes = esize DIV 8; constant boolean contiguous = TRUE; constant boolean nontemporal = FALSE; constant boolean tagchecked = TRUE; constant AccessDescriptor accdesc = CreateAccDescSME(MemOp_LOAD, nontemporal, contiguous, tagchecked); if n == 31 then if (AnyActiveElement(mask, esize) || ConstrainUnpredictableBool(Unpredictable_CHECKSPNONEACTIVE)) then CheckSPAlignment(); base = SP[]; else base = X[n, 64]; for e = 0 to dim - 1 addr = AddressAdd(base, UInt(moffs) * mbytes, accdesc); if ActivePredicateElement(mask, e, esize) then Elem[result, e, esize] = Mem[addr, mbytes, accdesc]; else Elem[result, e, esize] = Zeros(esize); moffs = moffs + 1; ZAslice[t, esize, vertical, slice, VL] = result;
If PSTATE.DIT is 1, the timing of this instruction is insensitive to the value of the data being loaded or stored when its governing predicate register contains the same value for each execution.
Internal version only: aarchmrs v2024-03_relA, pseudocode v2024-03_rel, sve v2024-03_rel ; Build timestamp: 2024-03-26T09:45
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