From ef6bd64e7f55e586803dbf4596574132cd5063d4 Mon Sep 17 00:00:00 2001
From: Nate Chandler <nate_chandler@apple.com>
Date: Fri, 24 Oct 2025 15:31:18 -0700
Subject: [PATCH 1/2] [CastOptimizer] Use TypeConverter to lower type.

rdar://162922634
---
 lib/SILOptimizer/Utils/CastOptimizer.cpp         | 12 ++++++------
 validation-test/SILOptimizer/rdar162922634.swift |  9 +++++++++
 2 files changed, 15 insertions(+), 6 deletions(-)
 create mode 100644 validation-test/SILOptimizer/rdar162922634.swift

diff --git a/lib/SILOptimizer/Utils/CastOptimizer.cpp b/lib/SILOptimizer/Utils/CastOptimizer.cpp
index 263d6952c2a13..b6b99731452fa 100644
--- a/lib/SILOptimizer/Utils/CastOptimizer.cpp
+++ b/lib/SILOptimizer/Utils/CastOptimizer.cpp
@@ -332,7 +332,7 @@ CastOptimizer::optimizeBridgedObjCToSwiftCast(SILDynamicCastInst dynamicCast) {
                      ->getImplementationType()
                      ->getCanonicalType();
     Tmp = Builder.createAllocStack(Loc,
-                                   SILType::getPrimitiveObjectType(OptionalTy));
+                                   F->getLoweredType(OptionalTy));
     outOptionalParam = Tmp;
   } else {
     outOptionalParam = Dest;
@@ -446,10 +446,11 @@ CastOptimizer::optimizeBridgedObjCToSwiftCast(SILDynamicCastInst dynamicCast) {
 
 static bool canOptimizeCast(const swift::Type &BridgedTargetTy,
                             swift::SILFunctionConventions &substConv,
-                            TypeExpansionContext context) {
+                            const SILFunction *F) {
+  auto context = F->getTypeExpansionContext();
+
   // DestTy is the type which we want to convert to
-  SILType DestTy =
-      SILType::getPrimitiveObjectType(BridgedTargetTy->getCanonicalType());
+  SILType DestTy = F->getLoweredType(BridgedTargetTy->getCanonicalType());
   // ConvTy  is the return type of the _bridgeToObjectiveCImpl()
   auto ConvTy = substConv.getSILResultType(context).getObjectType();
   if (ConvTy == DestTy) {
@@ -652,8 +653,7 @@ CastOptimizer::optimizeBridgedSwiftToObjCCast(SILDynamicCastInst dynamicCast) {
 
   // Check that this is a case that the authors of this code thought it could
   // handle.
-  if (!canOptimizeCast(BridgedTargetTy, substConv,
-                       F->getTypeExpansionContext())) {
+  if (!canOptimizeCast(BridgedTargetTy, substConv, F)) {
     return nullptr;
   }
 
diff --git a/validation-test/SILOptimizer/rdar162922634.swift b/validation-test/SILOptimizer/rdar162922634.swift
new file mode 100644
index 0000000000000..7f3813758d3c3
--- /dev/null
+++ b/validation-test/SILOptimizer/rdar162922634.swift
@@ -0,0 +1,9 @@
+// RUN: %target-swift-frontend -O -emit-sil -verify %s
+
+// REQUIRES: objc_interop
+
+import Foundation
+
+func f(_ x: [AnyHashable]) -> [NSObject.Type]? {
+  return x as? [NSObject.Type]
+}

From 41a7d7cab9682d3b6beb56fc2f2d60b8b027c37b Mon Sep 17 00:00:00 2001
From: Nate Chandler <nate_chandler@apple.com>
Date: Fri, 24 Oct 2025 15:34:35 -0700
Subject: [PATCH 2/2] [CastOptimizer] Use TypeConverter to lower type, 2

---
 lib/SILOptimizer/Utils/CastOptimizer.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/SILOptimizer/Utils/CastOptimizer.cpp b/lib/SILOptimizer/Utils/CastOptimizer.cpp
index b6b99731452fa..7548db0f10ae1 100644
--- a/lib/SILOptimizer/Utils/CastOptimizer.cpp
+++ b/lib/SILOptimizer/Utils/CastOptimizer.cpp
@@ -331,8 +331,7 @@ CastOptimizer::optimizeBridgedObjCToSwiftCast(SILDynamicCastInst dynamicCast) {
     OptionalTy = OptionalType::get(Dest->getType().getASTType())
                      ->getImplementationType()
                      ->getCanonicalType();
-    Tmp = Builder.createAllocStack(Loc,
-                                   F->getLoweredType(OptionalTy));
+    Tmp = Builder.createAllocStack(Loc, F->getLoweredType(OptionalTy));
     outOptionalParam = Tmp;
   } else {
     outOptionalParam = Dest;