readfirstlane_u64 in core::arch::amdgpu - Rust
Description: Get `value` from the first active lane in the wavefront.

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## readfirstlane_u64

# Function readfirstlane_u64

Source

    pub fn readfirstlane_u64(value: u64) -> u64

🔬This is a nightly-only experimental API. (`stdarch_amdgpu` #149988)
Available on AMD GPU only.
Expand description

Get `value` from the first active lane in the wavefront.

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.