# System.Runtime.Intrinsics.X86

``` diff
 namespace System.Runtime.Intrinsics.X86 {
     public abstract class Avx512F : Avx2 {
+        public static Vector512<double> Add(Vector512<double> left, Vector512<double> right, FloatRoundingMode mode);
     }
+    public enum FloatRoundingMode : byte {
+        ToEven = (byte)8,
+        ToNegativeInfinity = (byte)9,
+        ToPositiveInfinity = (byte)10,
+        ToZero = (byte)11,
+    }
 }
```

