From a6aac1f627df54c0bb71afa7f287ba4b2a5b9440 Mon Sep 17 00:00:00 2001
From: Tanner Gooding <tagoo@outlook.com>
Date: Fri, 4 Sep 2020 11:40:52 -0700
Subject: [PATCH] Marking Matrix3x2, Matrix4x4, Plane, and Quaternion as
 Intrinsic (#41829)

---
 .../System.Private.CoreLib/src/System/Numerics/Matrix3x2.cs     | 2 ++
 .../System.Private.CoreLib/src/System/Numerics/Matrix4x4.cs     | 2 +-
 .../System.Private.CoreLib/src/System/Numerics/Plane.cs         | 1 +
 .../System.Private.CoreLib/src/System/Numerics/Quaternion.cs    | 2 ++
 4 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/libraries/System.Private.CoreLib/src/System/Numerics/Matrix3x2.cs b/src/libraries/System.Private.CoreLib/src/System/Numerics/Matrix3x2.cs
index 5f65ddd3fd00af..a70b3d776c2a1b 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Numerics/Matrix3x2.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Numerics/Matrix3x2.cs
@@ -2,12 +2,14 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Globalization;
+using System.Runtime.CompilerServices;
 
 namespace System.Numerics
 {
     /// <summary>
     /// A structure encapsulating a 3x2 matrix.
     /// </summary>
+    [Intrinsic]
     public struct Matrix3x2 : IEquatable<Matrix3x2>
     {
         private const float RotationEpsilon = 0.001f * MathF.PI / 180f;     // 0.1% of a degree
diff --git a/src/libraries/System.Private.CoreLib/src/System/Numerics/Matrix4x4.cs b/src/libraries/System.Private.CoreLib/src/System/Numerics/Matrix4x4.cs
index d009951583d8e6..cfd16ad73e7b59 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Numerics/Matrix4x4.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Numerics/Matrix4x4.cs
@@ -14,7 +14,7 @@ namespace System.Numerics
     /// <summary>
     /// A structure encapsulating a 4x4 matrix.
     /// </summary>
-    [StructLayout(LayoutKind.Sequential)]
+    [Intrinsic]
     public struct Matrix4x4 : IEquatable<Matrix4x4>
     {
         private const float BillboardEpsilon = 1e-4f;
diff --git a/src/libraries/System.Private.CoreLib/src/System/Numerics/Plane.cs b/src/libraries/System.Private.CoreLib/src/System/Numerics/Plane.cs
index f03d5698efe896..631f6da2cef89a 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Numerics/Plane.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Numerics/Plane.cs
@@ -9,6 +9,7 @@ namespace System.Numerics
     /// <summary>
     /// A structure encapsulating a 3D Plane
     /// </summary>
+    [Intrinsic]
     public struct Plane : IEquatable<Plane>
     {
         private const float NormalizeEpsilon = 1.192092896e-07f; // smallest such that 1.0+NormalizeEpsilon != 1.0
diff --git a/src/libraries/System.Private.CoreLib/src/System/Numerics/Quaternion.cs b/src/libraries/System.Private.CoreLib/src/System/Numerics/Quaternion.cs
index 34e06ac7311ca3..b7a5bc39765506 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Numerics/Quaternion.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Numerics/Quaternion.cs
@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Globalization;
+using System.Runtime.CompilerServices;
 
 namespace System.Numerics
 {
@@ -9,6 +10,7 @@ namespace System.Numerics
     /// A structure encapsulating a four-dimensional vector (x,y,z,w),
     /// which is used to efficiently rotate an object about the (x,y,z) vector by the angle theta, where w = cos(theta/2).
     /// </summary>
+    [Intrinsic]
     public struct Quaternion : IEquatable<Quaternion>
     {
         private const float SlerpEpsilon = 1e-6f;