SMOPS (2-way)
Signed integer sum of outer products and subtract
This instruction works with a 32-bit element ZA tile.
The signed integer sum of outer products and subtract instructions multiply the sub-matrix in the first source vector by the sub-matrix in the second source vector. The first source holds SVLS×2 sub-matrix of signed 16-bit integer values, and the second source holds 2×SVLS sub-matrix of signed 16-bit integer values.
Each source vector is independently predicated by a corresponding governing predicate. When a 16-bit source element is inactive, it is treated as having the value 0.
The resulting SVLS×SVLS widened 32-bit integer sum of outer products is then destructively subtracted from the 32-bit integer destination tile. This is equivalent to performing a 2-way dot product and subtract from each of the destination tile elements.
Each 32-bit container of the first source vector holds 2 consecutive column elements of each row of a SVLS×2 sub-matrix, and each 32-bit container of the second source vector holds 2 consecutive row elements of each column of a 2×SVLS sub-matrix.
Green
True
True
SM_1_only
True
1
0
1
0
0
0
0
0
1
0
0
1
1
0
SMOPS <ZAda>.S, <Pn>/M, <Pm>/M, <Zn>.H, <Zm>.H
if !IsFeatureImplemented(FEAT_SME2) then UNDEFINED;
constant integer esize = 32;
constant integer a = UInt(Pn);
constant integer b = UInt(Pm);
constant integer n = UInt(Zn);
constant integer m = UInt(Zm);
constant integer da = UInt(ZAda);
constant boolean unsigned = FALSE;
<ZAda>
Is the name of the ZA tile ZA0-ZA3, encoded in the "ZAda" field.
<Pn>
Is the name of the first governing scalable predicate register P0-P7, encoded in the "Pn" field.
<Pm>
Is the name of the second governing scalable predicate register P0-P7, encoded in the "Pm" field.
<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.
CheckStreamingSVEAndZAEnabled();
constant integer VL = CurrentVL;
constant integer PL = VL DIV 8;
constant integer dim = VL DIV esize;
constant bits(PL) mask1 = P[a, PL];
constant bits(PL) mask2 = P[b, PL];
constant bits(VL) operand1 = Z[n, VL];
constant bits(VL) operand2 = Z[m, VL];
constant bits(dim*dim*esize) operand3 = ZAtile[da, esize, dim*dim*esize];
bits(dim*dim*esize) result;
integer prod;
for row = 0 to dim-1
for col = 0 to dim-1
bits(esize) sum = Elem[operand3, row*dim+col, esize];
for k = 0 to 1
if (ActivePredicateElement(mask1, 2*row + k, esize DIV 2) &&
ActivePredicateElement(mask2, 2*col + k, esize DIV 2)) then
prod = (Int(Elem[operand1, 2*row + k, esize DIV 2], unsigned) *
Int(Elem[operand2, 2*col + k, esize DIV 2], unsigned));
sum = sum - prod;
Elem[result, row*dim+col, esize] = sum;
ZAtile[da, esize, dim*dim*esize] = result;