diff --git a/tests/filecheck/transforms/cse.mlir b/tests/filecheck/transforms/cse.mlir
index 60a4d0fc6f..68da590f19 100644
--- a/tests/filecheck/transforms/cse.mlir
+++ b/tests/filecheck/transforms/cse.mlir
@@ -13,6 +13,17 @@ func.func @simple_constant() -> (i32, i32) {
 // CHECK-NEXT:      func.return %0, %0 : i32, i32
 // CHECK-NEXT:    }
 
+func.func @simple_float_constant() -> (f32, f32) {
+    %0 = arith.constant 1.0 : f32
+    %1 = arith.constant 1.0 : f32
+    func.return %0, %1 : f32, f32
+}
+
+// CHECK:         func.func @simple_float_constant() -> (f32, f32) {
+// CHECK-NEXT:      %0 = arith.constant 1.000000e+00 : f32
+// CHECK-NEXT:      func.return %0, %0 : f32, f32
+// CHECK-NEXT:    }
+
 // CHECK-LABEL: @basic
   func.func @basic() -> (index, index) {
     %2 = arith.constant 0 : index
diff --git a/xdsl/dialects/builtin.py b/xdsl/dialects/builtin.py
index 5ef3fd8b35..820a411b0f 100644
--- a/xdsl/dialects/builtin.py
+++ b/xdsl/dialects/builtin.py
@@ -636,6 +636,9 @@ def __eq__(self, other: Any):
             math.isnan(self.data) and math.isnan(other.data) or self.data == other.data
         )
 
+    def __hash__(self):
+        return hash(self.data)
+
 
 _FloatAttrType = TypeVar("_FloatAttrType", bound=AnyFloat, covariant=True)