---

yaml
---
r: 294855
b: refs/heads/tensorflow
c: 21a0eee
h: refs/heads/master
i:
  294853: 6712d27
  294851: f53ebc4
  294847: 52d6c7e

Author: rxwei

[refs]

@@ -816,7 +816,7 @@ refs/tags/swift-DEVELOPMENT-SNAPSHOT-2018-04-25-a: 22f738a831d43aff2b9c9773bcb65
 refs/tags/swift-DEVELOPMENT-SNAPSHOT-2018-05-08-a: 7d98cc16689baba5c8a3b90a9329bdcc1a12b4e9
 refs/heads/cherr42: a566ad54b073c2c56ac0a705d0a5bed9743135a5
 "refs/heads/codable_test_comment_fix": fc8f6824f7f347e1e8db55bff62db385c5728b5a
-refs/heads/tensorflow: f537a9205d833236b7dd2a5c146c20a0c9bd437d
+refs/heads/tensorflow: 21a0eee438e5117b014f225bc3b31967d10e3f2e
 refs/tags/swift-4.1-DEVELOPMENT-SNAPSHOT-2018-05-11-a: 8126fd7a652e2f70ad6d76505239e34fb2ef3e1a
 refs/tags/swift-4.1-DEVELOPMENT-SNAPSHOT-2018-05-12-a: b3fd3dd84df6717f2e2e9df58c6d7e99fed57086
 refs/tags/swift-4.1-DEVELOPMENT-SNAPSHOT-2018-05-13-a: 71135119579039dc321c5f65d870050fe36efda2

branches/tensorflow/lib/SILOptimizer/Mandatory/Differentiation.cpp

@@ -4541,8 +4541,11 @@ class AdjointEmitter final : public SILInstructionVisitor<AdjointEmitter> {
       break;
     }
     case AdjointValueKind::Aggregate: {
-      llvm_unreachable("Unhandled. Are you trying to differentiate a "
-                       "memberwise initializer?");
+      // Note: All user-called initializations go through the calls to the
+      // initializer, and synthesized initializers only have one level of struct
+      // formation which will not result into any aggregate adjoint valeus.
+      llvm_unreachable("Aggregate adjoint values should not occur for `struct` "
+                       "instructions");
     }
     }
   }

branches/tensorflow/test/AutoDiff/simple_math.swift

@@ -184,7 +184,8 @@ SimpleMathTests.test("StructMemberwiseInitializer") {
 
   let 𝛁foo = pullback(at: Float(4), in: { input -> Foo in
     let foo = Foo(stored: input)
-    return foo + foo
+    let foo2 = foo + foo
+    return Foo(stored: foo2.stored)
   })(Foo.TangentVector(stored: 1))
   expectEqual(2, 𝛁foo)