hcos

Applicability

Function Usage

Obtains the cosine of the input data.

Prototype

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inline half hcos(half x)

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inline bfloat16_t hcos(bfloat16_t x)

Parameters

Returns

Cosine of the input data.

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

Restrictions

When this API is used, the maximum number of threads cannot exceed 1024. Otherwise, stack overflow may occur.

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 KernelCos(__gm__ half* dst, __gm__ half* x)
{
    int idx = threadIdx.x + blockIdx.x * blockDim.x;
    dst[idx] = hcos(x[idx]); // Obtain the cosine of the idxth element of the src source address.
}