Function safe_arch::fused_mul_neg_add_m128_s

#[must_use]pub fn fused_mul_neg_add_m128_s(a: m128, b: m128, c: m128) -> m128

This is supported with target feature fma only.

Low lane -(a * b) + c, other lanes unchanged.

let a = m128::from_array([2.0, 3.0, 4.0, 5.0]);
let b = m128::from_array([4.0, 5.0, 6.0, 7.0]);
let c = m128::from_array([1.0, 1.0, 1.0, 1.0]);
let d = fused_mul_neg_add_m128_s(a, b, c).to_array();
assert_eq!(d, [-7.0, 3.0, 4.0, 5.0]);

• Intrinsic: _mm_fnmadd_ss
• Assembly: one of
  • vfnmadd132ss xmm, xmm, xmm
  • vfnmadd213ss xmm, xmm, xmm
  • vfnmadd231ss xmm, xmm, xmm