Group bits to right or left as selected by bitmask
This instruction separates bits in each element of the first source vector by gathering from the bit positions indicated by non-zero bits in the corresponding mask element of the second source vector to the lowest-numbered contiguous bits of the corresponding destination element, and from positions indicated by zero bits to the highest-numbered bits of the destination element, preserving the bit order within each group. This instruction is unpredicated.
ID_AA64ZFR0_EL1.BitPerm indicates whether this instruction is implemented.
This instruction is illegal when executed in Streaming SVE mode, unless FEAT_SME_FA64 is implemented and enabled.
| 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 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | size | 0 | Zm | 1 | 0 | 1 | 1 | 1 | 0 | Zn | Zd | |||||||||||||
if !IsFeatureImplemented(FEAT_SVE) || !IsFeatureImplemented(FEAT_SVE_BitPerm) then UNDEFINED; constant integer esize = 8 << UInt(size); constant integer n = UInt(Zn); constant integer m = UInt(Zm); constant integer d = UInt(Zd);
| <Zd> |
Is the name of the destination scalable vector register, encoded in the "Zd" field. |
| <T> |
Is the size specifier,
encoded in
|
| <Zn> |
Is the name of the first source scalable vector register, encoded in the "Zn" field. |
| <Zm> |
Is the name of the second source scalable vector register, encoded in the "Zm" field. |
CheckNonStreamingSVEEnabled(); constant integer VL = CurrentVL; constant integer elements = VL DIV esize; constant bits(VL) data = Z[n, VL]; constant bits(VL) mask = Z[m, VL]; bits(VL) result; for e = 0 to elements - 1 Elem[result, e, esize] = BitGroup(Elem[data, e, esize], Elem[mask, e, esize]); Z[d, VL] = result;
If PSTATE.DIT is 1:
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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