Function accel_statevec_packAmpsIntoBuffer

quest/src/core/accelerator.cpp:247–260

qindex accel_statevec_packAmpsIntoBuffer(Qureg qureg, vector<int> qubits, vector<int> qubitStates) {

    // we can never pack and swap buffers when there are no constrained qubit states, because we'd 
    // then fill the entire buffer andhave no room to receive the other node's buffer; caller would 
    // instead send amps straight to buffer
    if (qubitStates.empty())
        error_noCtrlsGivenToBufferPacker();

    // note qubits may incidentally be ctrls or targs; it doesn't matter
    auto func = GET_CPU_OR_GPU_FUNC_OPTIMISED_FOR_NUM_TARGS( statevec_packAmpsIntoBuffer, qureg, qubits.size() );
    
    // return the number of packed amps, for caller convenience
    return func(qureg, qubits, qubitStates);
}


qindex accel_statevec_packPairSummedAmpsIntoBuffer(Qureg qureg, int qubit1, int qubit2, int qubit3, int bit2) {