Broadcast indexed element to vector (unpredicated)
This instruction unconditionally broadcasts the indexed source vector element into each element of the destination vector. This instruction is unpredicated.
The immediate element index is in the range of 0 to 63 (bytes), 31 (halfwords), 15 (words), 7 (doublewords) or 3 (quadwords). Selecting an element beyond the accessible vector length causes the destination vector to be set to zero.
This instruction is used by the alias MOV (SIMD&FP scalar, 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 |
| 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | imm2 | 1 | tsz | 0 | 0 | 1 | 0 | 0 | 0 | Zn | Zd | |||||||||||||
if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then EndOfDecode(Decode_UNDEF); end; if tsz == '00000' then EndOfDecode(Decode_UNDEF); end; let lsb : integer{} = LowestSetBit(tsz); let esize : integer{} = 8 << lsb; let imm : bits(7) = imm2::tsz; let index : integer = UInt(imm[6:(lsb+1)]); let n : integer = UInt(Zn); let d : integer = 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 source scalable vector register, encoded in the "Zn" field. |
| <imm> |
Is the immediate index, in the range 0 to one less than the number of elements in 512 bits, encoded in "imm2:tsz". |
| Alias | Is preferred when |
|---|---|
| MOV (SIMD&FP scalar, unpredicated) | BitCount(imm2 :: tsz) == 1 |
| MOV (SIMD&FP scalar, unpredicated) | BitCount(imm2 :: tsz) > 1 |
CheckSVEEnabled(); let VL : integer{} = CurrentVL(); let elements : integer = VL DIV esize; let operand1 : bits(VL) = if index < elements then Z{VL}(n) else Zeros{VL}; var result : bits(VL); var element : bits(esize); if index >= elements then element = Zeros{esize}; else element = operand1[index*:esize]; end; result = Replicate{VL}(element); Z{VL}(d) = 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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