[MLIR] fix _f64ElementsAttr in ir.py (#91176)

Author: qingyunqu

mlir/python/mlir/ir.py

@@ -274,7 +274,7 @@ def _memref_type_attr(x, context):
     @register_attribute_builder("F64ElementsAttr")
     def _f64ElementsAttr(x, context):
         return DenseElementsAttr.get(
-            np.array(x, dtype=np.int64),
+            np.array(x, dtype=np.float64),
             type=F64Type.get(context=context),
             context=context,
         )

mlir/test/python/dialects/python_test.py

@@ -167,7 +167,7 @@ def attrBuilder():
             x_f32arr=[2.0, 3.0],
             x_f64=4.25,  # CHECK-DAG: x_f64 = 4.250000e+00 : f64
             x_f64arr=[4.0, 8.0],  # CHECK-DAG: x_f64arr = [4.000000e+00, 8.000000e+00]
-            # CHECK-DAG: x_f64elems = dense<[3.952530e-323, 7.905050e-323]> : tensor<2xf64>
+            # CHECK-DAG: x_f64elems = dense<[8.000000e+00, 1.600000e+01]> : tensor<2xf64>
             x_f64elems=[8.0, 16.0],
             # CHECK-DAG: x_flatsymrefarr = [@symbol1, @symbol2]
             x_flatsymrefarr=["symbol1", "symbol2"],