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## ballot

# Function ballot

Source

    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.