diff --git a/pkg/compiler/lib/src/ssa/optimize.dart b/pkg/compiler/lib/src/ssa/optimize.dart
index 4f469946293..aae3fd20c3c 100644
--- a/pkg/compiler/lib/src/ssa/optimize.dart
+++ b/pkg/compiler/lib/src/ssa/optimize.dart
@@ -2847,7 +2847,8 @@ class SsaInstructionSimplifier extends HBaseVisitor<HInstruction>
   }
 
   bool _isFull32BitMask(ConstantValue constant) {
-    return constant is IntConstantValue && constant.intValue == _mask32;
+    return constant is IntConstantValue &&
+        constant.intValue.toUnsigned(32) == _mask32;
   }
 
   static final _mask32 = BigInt.parse('FFFFFFFF', radix: 16);
diff --git a/pkg/compiler/test/codegen/data/bitand.dart b/pkg/compiler/test/codegen/data/bitand.dart
new file mode 100644
index 00000000000..21f131da1d1
--- /dev/null
+++ b/pkg/compiler/test/codegen/data/bitand.dart
@@ -0,0 +1,49 @@
+// Copyright (c) 2026, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Data for a `../codegen_shard*_test.dart` test.
+
+/*member: main:ignore*/
+void main() {
+  for (var a in [0x123456789, 0, -2]) {
+    sink = recognizeMask32(a);
+    sink = recognizeMaskToUint32(a);
+    sink = recognizeNegativeMaskToUint32(a);
+    sink = recognizeAndFromToUnsigned(a);
+  }
+}
+
+Object? sink;
+
+@pragma('dart2js:noInline')
+/*member: recognizeMask32:function(thing) {
+  return thing >>> 0;
+}*/
+int recognizeMask32(int thing) {
+  return thing & 0xFFFF_FFFF;
+}
+
+@pragma('dart2js:noInline')
+/*member: recognizeMaskToUint32:function(thing) {
+  return thing >>> 0;
+}*/
+int recognizeMaskToUint32(int thing) {
+  return thing & 0xFFFF_FFFF_FFFF;
+}
+
+@pragma('dart2js:noInline')
+/*member: recognizeNegativeMaskToUint32:function(thing) {
+  return thing >>> 0;
+}*/
+int recognizeNegativeMaskToUint32(int thing) {
+  return thing & -1;
+}
+
+@pragma('dart2js:noInline')
+/*member: recognizeAndFromToUnsigned:function(thing) {
+  return thing >>> 0;
+}*/
+int recognizeAndFromToUnsigned(int thing) {
+  return thing.toUnsigned(32);
+}