Function i64x2_bitmask

pub fn i64x2_bitmask(a: v128) -> u8

🔬This is a nightly-only experimental API. (simd_wasm64 #90599)

Available on target_family="wasm" and target feature simd128 and WebAssembly only.

Extracts the high bit for each lane in a and produce a scalar mask with all bits concatenated.