atan2f

Applicability

Function Usage

Obtains the arc tangent of y/x of the input data.

Prototype

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inline float atan2f(float y, float x)

Parameters

Returns

Arc tangent of y/x.

• If either x or y is nan, the return value is nan.
• If x is 0 and y is 0, the return value is nan.
• If y is inf and x is inf, the return value is π/4.
• If y is -inf and x is inf, the return value is -π/4.
• If y is 1 and x is inf, the return value is 0.0.
• If y is inf and x is -inf, the return value is π3/4.
• If y is -inf and x is -inf, the return value is -π3/4.
• If y is 1 and x is -inf, the return value is π.
• If y is inf and x is 1, the return value is π/2.
• If y is -inf and x is 1, the return value is -π/2.

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 KernelAtan2(__gm__ float* dst, __gm__ float* y, __gm__ float* x)
{
    int idx = threadIdx.x + blockIdx.x * blockDim.x;
    dst[idx] = atan2f(y[idx], x[idx]);
}