CountBitsCntSameAsSignBit

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

Computes the number of consecutive bits that are the same as the sign bit from the most significant bit in the binary number of the int64_t type.

If the input is -1 (all bits are 1) or 0 (all bits are 0), -1 is returned.

Prototype

__aicore__ inline int64_t CountBitsCntSameAsSignBit(int64_t valueIn)

Parameters

**Table 1** Parameters
Parameter	Input/Output	Description
valueIn	Input	Input data of the int64_t type.

Returns

The number of consecutive bits that are the same as the sign bit starting from the most significant bit.

Constraints

None

Example

int64_t valueIn = 0x0f00000000000000;
// Output (ans): 3. The sign bit is 0, and the fourth bit is 1. Therefore, the number of bits that are the same as the most significant bit is 3.
int64_t ans = AscendC::CountBitsCntSameAsSignBit(valueIn);

Parent topic: Scalar Computation