RWByteAddressBuffer.InterlockedCompareExchangeU64¶

Description¶

Perform a 64-bit integer atomic compare-and-exchange operation at byteAddress.

Signature¶

void RWByteAddressBuffer.InterlockedCompareExchangeU64(
    uint byteAddress,
    uint64_t compareValue,
    uint64_t value,
    out uint64_t outOriginalValue);

Parameters¶

byteAddress : uint¶

The address at which to perform the atomic compare-and-exchange operation.

compareValue : uint64_t¶

The value to compare to the value at byteAddress.

value : uint64_t¶

The value to store at byteAddress if the comparison is successful.

outOriginalValue : uint64_t¶

The original value at byteAddress before the add operation.

Remarks¶

For SPIR-V, this function maps to OpAtomicCompareExchange. For HLSL, this function translates to InterlockedCompareExchange64 and requires shader model 6.6. For CUDA, this function maps to atomicCAS.

Availability and Requirements¶

Defined for the following targets:

hlsl¶

Available in all stages.

glsl¶

Available in all stages.

cuda¶

Available in all stages.

spirv¶

Available in all stages.

Requires capability: spvInt64Atomics.