lgammaf

Applicability

Function Usage

Obtains the absolute value of the gamma value of the input data x and calculates the natural logarithm.

Prototype

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inline float lgammaf(float x)

Parameters

Returns

The absolute value of the gamma value of the input data. The natural logarithm is used.

• If x is 0, the return value is inf.
• If x is inf, the return value is inf.
• If x is -inf, the return value is inf.
• If x is nan, the return value is nan.
• If the return value exceeds the maximum range of float, the return value is inf.
• If the return value exceeds the minimum range of float, 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.

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#include "simt_api/math_functions.h"

Examples

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