Add subtract pairwise
This instruction adds pairs of adjacent elements within the first source vector and subtracts pairs of adjacent elements within the second source vector, and places the interleaved results in the destination 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 |
| 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | size | 1 | Zm | 0 | 1 | 1 | 1 | 1 | 1 | Zn | Zd | |||||||||||||
if !IsFeatureImplemented(FEAT_SVE2p3) && !IsFeatureImplemented(FEAT_SME2p3) then EndOfDecode(Decode_UNDEF); 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. |
CheckSVEEnabled(); constant integer VL = CurrentVL; constant integer pairs = VL DIV (esize * 2); constant bits(VL) operand1 = Z[n, VL]; constant bits(VL) operand2 = Z[m, VL]; bits(VL) result; for e = 0 to pairs-1 constant integer elt1_a = UInt(Elem[operand1, 2*e + 0, esize]); constant integer elt1_b = UInt(Elem[operand1, 2*e + 1, esize]); constant integer elt2_a = UInt(Elem[operand2, 2*e + 0, esize]); constant integer elt2_b = UInt(Elem[operand2, 2*e + 1, esize]); constant integer res1 = elt1_a + elt1_b; constant integer res2 = elt2_a - elt2_b; Elem[result, 2*e + 0, esize] = res1<esize-1:0>; Elem[result, 2*e + 1, esize] = res2<esize-1:0>; Z[d, VL] = result;
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
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