hlog

Applicability

Function Usage

Obtains the logarithm of the input data with base e.

Prototype

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inline half hlog(half x)

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inline bfloat16_t hlog(bfloat16_t x)

Parameters

Returns

Logarithm of x with base e.

• If x is less than 0 or x is nan, the return value is nan.
• If x is 0, 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 the half API, the simt_api/asc_fp16.h header file must be included. To use the bfloat16_t API, the simt_api/asc_bf16.h header file must be included.

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#include "simt_api/asc_fp16.h"

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#include "simt_api/asc_bf16.h"

Examples

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