copysignf

Applicability

Function Usage

Obtains a floating-point number composed of the magnitude of the first input x and the sign of the second input y.

Prototype

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inline float copysignf(float x, float y)

Parameters

Returns

• If y is greater than or equal to 0, the absolute value Abs(x) of x is returned.
• If y is less than 0, the opposite number of the absolute value of x is returned, that is, -Abs(x).
• If y is nan, -Abs(x) is returned.
• If y is -inf, -Abs(x) is returned.
• If y is inf, Abs(x) is returned.

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