__brev

Applicability

Function Usage

Reverses the bit order of the input data and returns the reversed value.

Prototype

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unsigned int __brev(unsigned int x)

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unsigned long long __brev(unsigned long long x)

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unsigned long __brev(unsigned long x)

Parameters

Returns

Reversed value of the bit order of the input data. If the input type is uint32_t, the nth bit of the return value corresponds to the 31–nth bit of the input data. If the input type is uint64_t, the nth bit of the return value corresponds to the 63–nth bit of the input data.

• If x is 0 and the type is uint32_t, the return value is 0.
• If x is 0 and the type is uint64_t, the return value is 0.
• If x is 1 and the type is uint32_t, the return value is 2147483648.
• If x is 1 and the type is uint64_t, the return value is 9223372036854775808.

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.

Examples

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__simt_vf__ __launch_bounds__(1024) inline void KernelBrev(__gm__ unsigned int* dst, __gm__ unsigned int* x)
{
    int idx = threadIdx.x + blockIdx.x * blockDim.x;
    dst[idx] = __brev(x[idx]);
}

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__simt_vf__ __launch_bounds__(1024) inline void KernelBrev(__gm__ unsigned long long* dst, __gm__ unsigned long long* x)
{
    int idx = threadIdx.x + blockIdx.x * blockDim.x;
    dst[idx] = __brev(x[idx]);
}