Saturating complex integer add with rotate
Add the real and imaginary components of the integral complex numbers from the first source vector to the complex numbers from the second source vector which have first been rotated by 90 or 270 degrees in the direction from the positive real axis towards the positive imaginary axis, when considered in polar representation, equivalent to multiplying the complex numbers in the second source vector by ±j beforehand. Destructively place the results in the corresponding elements of the first source vector. Each result element is saturated to the N-bit element's signed integer range -2(N-1) to (2(N-1) )-1. This instruction is unpredicated.
Each complex number is represented in a vector register as an even/odd pair of elements with the real part in the even-numbered element and the imaginary part in the odd-numbered element.
| 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 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 1 | rot | Zm | Zdn | |||||||||
if !IsFeatureImplemented(FEAT_SVE2) && !IsFeatureImplemented(FEAT_SME) then UNDEFINED; constant integer esize = 8 << UInt(size); constant integer m = UInt(Zm); constant integer dn = UInt(Zdn); constant boolean sub_i = (rot == '0'); constant boolean sub_r = (rot == '1');
| <Zdn> |
Is the name of the first source and destination scalable vector register, encoded in the "Zdn" field. |
| <T> |
Is the size specifier,
encoded in
|
| <Zm> |
Is the name of the second source scalable vector register, encoded in the "Zm" field. |
| <const> |
Is the const specifier,
encoded in
|
CheckSVEEnabled(); constant integer VL = CurrentVL; constant integer PL = VL DIV 8; constant integer pairs = VL DIV (2 * esize); constant bits(VL) operand1 = Z[dn, VL]; constant bits(VL) operand2 = Z[m, VL]; bits(VL) result; for p = 0 to pairs-1 integer acc_r = SInt(Elem[operand1, 2 * p + 0, esize]); integer acc_i = SInt(Elem[operand1, 2 * p + 1, esize]); constant integer elt2_r = SInt(Elem[operand2, 2 * p + 0, esize]); constant integer elt2_i = SInt(Elem[operand2, 2 * p + 1, esize]); if sub_i then acc_r = acc_r - elt2_i; acc_i = acc_i + elt2_r; if sub_r then acc_r = acc_r + elt2_i; acc_i = acc_i - elt2_r; Elem[result, 2 * p + 0, esize] = SignedSat(acc_r, esize); Elem[result, 2 * p + 1, esize] = SignedSat(acc_i, esize); Z[dn, VL] = result;
This instruction might be immediately preceded in program order by a MOVPRFX instruction. The MOVPRFX must conform to all of the following requirements, otherwise the behavior of the MOVPRFX and this instruction is constrained unpredictable:
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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