ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

Instruction Details
A8.6.358 VQDMLAL, VQDMLSL
Vector Saturating Doubling Multiply Accumulate Long multiplies corresponding elements in two
doubleword vectors, doubles the products, and accumulates the results into the elements of a quadword
vector.
Vector Saturating Doubling Multiply Subtract Long multiplies corresponding elements in two doubleword
vectors, subtracts double the products from corresponding elements of a quadword vector, and places the
results in the same quadword vector.
In both instructions, the second operand can be a scalar instead of a vector. For more information about
scalars see Advanced SIMD scalars on page A7-9.
If any of the results overflow, they are saturated. The cumulative saturation flag, QC, is set if saturation
occurs. For details see Pseudocode details of saturation on page A2-9.
Encoding T1 / A1 Advanced SIMD
VQD. ,,
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 1 1 0 1 1 1 1 1 D size Vn Vd 1 0 op 1 N 0 M 0 Vm
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
1 1 1 1 0 0 1 0 1 D size Vn Vd 1 0 op 1 N 0 M 0 Vm
if size == ‘11’ then SEE “Related encodings”;
if size == ‘00’ || Vd == ‘1’ then UNDEFINED;
add = (op == ‘0’);
scalar_form = FALSE; d = UInt(D:Vd); n = UInt(N:Vn); m = UInt(M:Vm);
esize = 8