ScalarCountLeadingZero

Product	Supported/Unsupported
Atlas A3 training products/Atlas A3 inference products	√
Atlas A2 training products/Atlas A2 inference products	√
Atlas 200I/500 A2 inference products	x
Atlas inference product's AI Core	√
Atlas inference product's Vector Core	x
Atlas training products	x

Computes the number of leading 0s of a uint64_t number (number of 0s from the most significant bit to the first 1 in the binary number).

__aicore__ inline int64_t ScalarCountLeadingZero(uint64_t valueIn)

**Table 1** Parameters
Parameter	Input/Output	Description
valueIn	Input	A binary number.

Return the number of leading zeros in valueIn.

None

uint64_t valueIn = 0x0fffffffffffffff;
// Output (ans): 4
int64_t ans = AscendC::ScalarCountLeadingZero(valueIn);

Parent topic: Scalar Computation