GetBitCount

Applicability

Product	Supported
Atlas 350 Accelerator Card	√
Atlas A3 training product/Atlas A3 inference product	√
Atlas A2 training product/Atlas A2 inference product	√
Atlas 200I/500 A2 inference product	x
Atlas inference product AI Core	√
Atlas inference product Vector Core	x
Atlas training product	x

Function Usage

Obtains the number of 0s or 1s in a binary number of the uint64_t type.

Prototype

template <int countValue> 
__aicore__ inline int64_t GetBitCount(uint64_t valueIn)

Parameters

**Table 1** Template parameters
Parameter	Description
countValue	0 or 1 to be counted. Enter 0 or 1.

**Table 2** Parameters
Parameter	Input/Output	Description
valueIn	Input	A binary number.

Returns

Number of 0s or 1s in valueIn.

Constraints

None

Example

uint64_t valueIn = 0xffff; // There are 16 1s in the binary format.
constexpr int countValue = 1;    // Count the number of 1s in the binary format of valueIn.
// Output (oneCount): 16
int64_t oneCount = AscendC::GetBitCount<countValue>(valueIn);

Parent topic: Scalar Computation