Function vmlsl_n_s16 

pub fn vmlsl_n_s16(a: int32x4_t, b: int16x4_t, c: i16) -> int32x4_t

Available on (AArch64 or ARM64EC) and (AArch64 or ARM64EC or target feature v7) and (ARM or AArch64 or ARM64EC) and target feature neon only.

Vector widening multiply subtract with scalar Arm’s documentation