Lookup table read with 6-bit indices (single)
This instruction copies indexed 8-bit elements from ZT0 to the destination vector using packed 6-bit indices from the bottom three quarters of the source vector. This instruction is unpredicated.
| 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 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | Zn | Zd | ||||||||
| opc | size | opc2 | |||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SME2p3) then EndOfDecode(Decode_UNDEF); constant integer esize = 8; constant integer isize = 6; constant integer n = UInt(Zn); constant integer d = UInt(Zd);
| <Zd> |
Is the name of the destination scalable vector register, encoded in the "Zd" field. |
| <Zn> |
Is the name of the source scalable vector register, encoded in the "Zn" field. |
CheckStreamingSVEEnabled(); CheckSMEZT0Enabled(); constant integer VL = CurrentVL; constant integer elements = VL DIV esize; constant bits(VL) indexes = Z[n, VL]; // Only 3/4 used constant bits(512) table = ZT0[512]; bits(VL) result; for e = 0 to elements-1 constant integer index = UInt(Elem[indexes, e, isize]); Elem[result, e, esize] = Elem[table, index, esize]; Z[d, VL] = result;
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
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