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SIMD ISAReturn TypeNameArgumentsInstruction Group
Neonint64_tvqdmulls_lane_s32(int32_t a, int32x2_t v, const int lane)Vector arithmetic / Multiply / Saturating multiply by scalar and widen
Description
Signed saturating Doubling Multiply Long (by element). This instruction multiplies each vector element in the lower or upper half of the first source SIMD&FP register by the specified vector element of the second source SIMD&FP register, doubles the results, places the final results in a vector, and writes the vector to the destination SIMD&FP register. All the values in this instruction are signed integer values.
Results
Dd result
This intrinsic compiles to the following instructions:

SQDMULL Dd,Sn,Vm.S[lane]

Argument Preparation
a register: Snv register: Vm.2Slane minimum: 0; maximum: 1
Architectures
A64

Operation

CheckFPAdvSIMDEnabled64();
bits(datasize)   operand1 = Vpart[n, part];
bits(datasize)   operand2 = Vpart[m, part];
bits(2*datasize) result;
integer element1;
integer element2;
bits(2*esize) product;
boolean sat;

for e = 0 to elements-1
    element1 = SInt(Elem[operand1, e, esize]);
    element2 = SInt(Elem[operand2, e, esize]);
    (product, sat) = SignedSatQ(2 * element1 * element2, 2*esize);
    Elem[result, e, 2*esize] = product;
    if sat then FPSR.QC = '1';

V[d] = result;