Rework differentiation of member access through `[DerivativeMember(DiffType.field)]` (#2460)

* wip: remove auto-diff for member access, add diff through property accessors.

* Fix getter-setter test.

* Fix getter-setter-multi test.

* Fix nested-jvp test.

* Use [DerivativeMember] attribute to differentiate through member access.

* Clean up.

* More cleanup.

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 3 insertions, 13 deletions

diff --git a/tests/autodiff/getter-setter-multi.slang b/tests/autodiff/getter-setter-multi.slang
index 61cb96a07..c19a3f6bb 100644
--- a/tests/autodiff/getter-setter-multi.slang
+++ b/tests/autodiff/getter-setter-multi.slang
@@ -13,23 +13,13 @@ struct B
 struct A : IDifferentiable
 {
     typedef B Differential;
-    
+
+    [DerivativeMember(B.z)]
     float3 x;
+    [DerivativeMember(B.k)]
     float y[10];
 
     [__unsafeForceInlineEarly]
-    static Ptr<float3.Differential> __getDifferentialFor_x(inout Differential b)
-    {
-        return &(b.z);
-    }
-
-    [__unsafeForceInlineEarly]
-    static Ptr<float.Differential[10]> __getDifferentialFor_y(inout Differential b)
-    {
-        return &(b.k);
-    }
-
-    [__unsafeForceInlineEarly]
     static Differential zero()
     {
         B b = {0.0};