diff --git a/src/plugin/impl/opr_io_dump.cpp b/src/plugin/impl/opr_io_dump.cpp
index 287c2338..d964dafe 100644
--- a/src/plugin/impl/opr_io_dump.cpp
+++ b/src/plugin/impl/opr_io_dump.cpp
@@ -34,6 +34,14 @@ double as_double(megdnn::dt_qint8& a) {
     return static_cast<double>(a.as_int8());
 }
 template <>
+double as_double(megdnn::dt_quint4& a) {
+    return static_cast<double>(a.as_uint8());
+}
+template <>
+double as_double(megdnn::dt_qint4& a) {
+    return static_cast<double>(a.as_int8());
+}
+template <>
 double as_double(megdnn::dt_qint32& a) {
     return static_cast<double>(a.as_int32());
 }
@@ -69,7 +77,10 @@ void do_print_host_val(
         sum2 += as_double(i) * as_double(i);
     };
     size_t nr = val.layout.total_nr_elems();
-    if (val.layout.is_contiguous()) {
+    bool normal_contig = !val.layout.dtype.is_low_bit() && val.layout.is_contiguous();
+    bool lowbit_contig =
+            val.layout.dtype.is_low_bit() && val.layout.is_physical_contiguous();
+    if (normal_contig || lowbit_contig) {
         ctype* ptr = val.ptr<ctype>();
         for (size_t i = 0; i < nr; ++i) {
             update(ptr[i]);
@@ -99,13 +110,14 @@ void print_host_val(
                 fout, max_nr_print, val, print_stat);
         MEGDNN_FOREACH_COMPUTING_DTYPE(cb)
         MEGDNN_FOREACH_QUANTIZED_DTYPE(cb)
+        MEGDNN_FOREACH_QUANTIZED_LOWBIT_DTYPE(cb)
+        cb(dtype::Bool)
 #undef cb
-        default:
-            mgb_throw(
-                    MegBrainError,
-                    "can not handle dtype %s in "
-                    "print_host_val",
-                    val.layout.dtype.name());
+                default : mgb_throw(
+                                  MegBrainError,
+                                  "can not handle dtype %s in "
+                                  "print_host_val",
+                                  val.layout.dtype.name());
     }
 };