Function svext_s8 

pub fn svext_s8<const IMM3: i32>(op1: svint8_t, op2: svint8_t) -> svint8_t

🔬This is a nightly-only experimental API. (stdarch_aarch64_sve #145052)

Available on (AArch64 or ARM64EC) and target feature sve only.

Extract vector from pair of vectors Arm’s documentation