rhypotf

Applicability

Function Usage

Obtains the reciprocal of the square root of the sum of squares of the input data x and y (x² + y²).

Prototype

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inline float rhypotf(float x, float y)

Parameters

Returns

Reciprocal of the square root of x^2 + y^2.

• If the square root of x^2 + y^2 exceeds the maximum range of float, the return value is 0.
• If the reciprocal of the square root of x^2 + y^2 exceeds the maximum range of float, the return value is inf.
• If both x and y are 0, the return value is inf.
• If either x or y is ±inf, the return value is 0.
• If either x or y is nan and the other is 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 KernelPow(__gm__ float* dst, __gm__ float* x, __gm__ float* y)
{
    int idx = threadIdx.x + blockIdx.x * blockDim.x;
    dst[idx] = rhypotf(x[idx], y[idx]);
}