norm4df

Applicability

Function Usage

Obtains the square root of the sum of squares of the input data a, b, c, and d (a² + b² + c² + d²).

Prototype

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inline float norm4df(float a, float b, float c, float d)

Parameters

Returns

Square root of a² + b² + c² + d².

• If the square root of a² + b² + c² + d² exceeds the maximum range of float, the return value is inf.
• If any one or more of a, b, c, and d are ±inf, the return value is inf.
• If one or more of a, b, c, and d are nan and not ±inf, the return value is nan.

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 KernelNorm4d(__gm__ float* dst, __gm__ float* a, __gm__ float* b, __gm__ float* c, __gm__ float* d)
{
    int idx = threadIdx.x + blockIdx.x * blockDim.x;
    dst[idx] = norm4df(a[idx], b[idx], c[idx], d[idx]);
}