Fix bug in UpdatePadding for int64_t type (#21465)

test=develop

paddle/fluid/operators/conv_op.h

@@ -90,7 +90,8 @@ inline void UpdatePaddingAndDilation(std::vector<T>* paddings,
     for (int i = 0; i < data_dims.size(); ++i) {
       T out_size = (data_dims[i] + strides[i] - 1) / strides[i];
       T pad_sum =
-          std::max((out_size - 1) * strides[i] + ksize[i] - data_shape[i], 0);
+          std::max((out_size - 1) * strides[i] + ksize[i] - data_shape[i],
+                   static_cast<T>(0));
       T pad_0 = pad_sum / 2;
       T pad_1 = pad_sum - pad_0;
       *(paddings->begin() + i * 2) = pad_0;

paddle/fluid/operators/pool_op.h

@@ -87,7 +87,8 @@ inline void UpdatePadding(std::vector<T>* paddings, const bool global_pooling,
     for (int i = 0; i < data_dims.size(); ++i) {
       T out_size = (data_dims[i] + strides[i] - 1) / strides[i];
       T pad_sum =
-          std::max((out_size - 1) * strides[i] + ksize[i] - data_shape[i], 0);
+          std::max((out_size - 1) * strides[i] + ksize[i] - data_shape[i],
+                   static_cast<T>(0));
       T pad_0 = pad_sum / 2;
       T pad_1 = pad_sum - pad_0;
       *(paddings->begin() + i * 2) = pad_0;