ldexpf

Applicability

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

Function Usage

Obtains the result of multiplying the input x by 2 raised to the power of exp.

$\text{[math]}$

Prototype

inline float ldexpf(float x, int exp)

Parameters

**Table 1** Parameters
Parameter	Input/Output	Description
x	Input	Source operand, input data.
exp	Input	Source operand, exponent.

Returns

Result of multiplying the input x by 2 raised to the power of exp.

If x is nan, the return value is nan.
If x is inf, the return value is inf.
If x is -inf, the return value is -inf.

Restrictions

For SIMT programming, this API is not supported.

Header File to Be Included

To use this API, the simt_api/math_functions.h header file must be included.

#include "simt_api/math_functions.h"

Examples

For SIMD and SIMT programming:

__simt_vf__ __launch_bounds__(1024) inline void KernelLdexp(__gm__ float* dst, __gm__ float* x, __gm__ int* exp)
{
    int idx = threadIdx.x + blockIdx.x * blockDim.x;
    dst[idx] = ldexpf(x[idx], exp[idx]);
}

Parent topic: Mathematical Functions