pub fn ballot(b: bool) -> u64🔬This is a nightly-only experimental API. (
stdarch_amdgpu #149988)Available on AMD GPU only.
Expand description
Returns a bitfield (u32 or u64) containing the result of its i1 argument
in all active lanes, and zero in all inactive lanes.
This intrinsic does not behave like a normal function call; it is a “convergent” operation and as such has non-standard control-flow effects which need special treatment by the language. Rust currently does not properly support convergent operations. This operation is hence provided on a best-effort basis. Using it may result in incorrect code under some circumstances.