__float2ull_rz

Applicability

Function Usage

Converts a floating-point number to a 64-bit unsigned integer in line with the CAST_TRUNC mode and returns the converted value.

Prototype

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inline unsigned long long int __float2ull_rz(const float x)

Parameters

Returns

The 64-bit unsigned integer converted from the input in line with the CAST_TRUNC mode. Special scenarios are described as follows:

• If x is nan, the return value is 0.
• If x is inf, the return value is 18446744073709551615.
• If x is -inf, the return value is 0.

Restrictions

For SIMT programming, this API is not supported.

Header File to Be Included

To use this API, the simt_api/device_functions.h header file must be included.

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#include "simt_api/device_functions.h"

Examples

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__simt_vf__ __launch_bounds__(1024) inline void kernel__float2ull_rz(__gm__ uint64_t* dst, __gm__ float* x)
{
    int idx = threadIdx.x + blockIdx.x * blockDim.x;
    dst[idx] = __float2ull_rz(x[idx]);
}