Macro safe_arch::round_m256

macro_rules! round_m256 {
    ($a:expr, Nearest) => { ... };
    ($a:expr, NegInf) => { ... };
    ($a:expr, PosInf) => { ... };
    ($a:expr, Zero) => { ... };
}

This is supported with target feature avx only.

Rounds each lane in the style specified.

let a = m256::from_array([-0.1, 1.6, 3.3, 4.5, 5.1, 6.5, 7.2, 8.0]);
//
assert_eq!(
  round_m256!(a, Nearest).to_array(),
  [0.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0]
);
//
assert_eq!(
  round_m256!(a, NegInf).to_array(),
  [-1.0, 1.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0]
);
//
assert_eq!(
  round_m256!(a, PosInf).to_array(),
  [0.0, 2.0, 4.0, 5.0, 6.0, 7.0, 8.0, 8.0]
);
//
assert_eq!(
  round_m256!(a, Zero).to_array(),
  [0.0, 1.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0]
);