diff --git a/examples/matrix.cpp b/examples/matrix.cpp
index 3a4877d36..3dd6b0cfa 100644
--- a/examples/matrix.cpp
+++ b/examples/matrix.cpp
@@ -22,7 +22,7 @@ const char src[] =
 "\
 void test(fp32 *A, fp32 *B, fp32 *C, int32 i){\
   int32 tile[16, 16] = 0;\
-  int32 test[16, 16] = tile + i;\
+  fp32 *test[16, 16] = tile + A;\
   i = 1;\
   A = A + i;\
 }\
diff --git a/lib/ast/lowering.cpp b/lib/ast/lowering.cpp
index 52d7a4a2e..6137e1022 100644
--- a/lib/ast/lowering.cpp
+++ b/lib/ast/lowering.cpp
@@ -56,7 +56,11 @@ void node::implicit_cast(ir::builder &builder, ir::value *&lhs, ir::value *&rhs,
   ir::type *left_ty = lhs->get_type()->get_scalar_ty();
   ir::type *right_ty = rhs->get_type()->get_scalar_ty();
   // One operand is pointer
-  if(left_ty->is_pointer_ty()){
+  if(left_ty->is_pointer_ty() || right_ty->is_pointer_ty()){
+    if(left_ty->is_pointer_ty() && right_ty->is_pointer_ty())
+      throw std::runtime_error("invalid operands");
+    if(right_ty->is_pointer_ty())
+      std::swap(lhs, rhs);
     is_ptr = true;
   }
   // One operand is double
diff --git a/lib/ir/instructions.cpp b/lib/ir/instructions.cpp
index a46c4f036..627645a09 100644
--- a/lib/ir/instructions.cpp
+++ b/lib/ir/instructions.cpp
@@ -248,7 +248,7 @@ getelementptr_inst::getelementptr_inst(type *pointee_ty, value *ptr, const std::
 
 type *getelementptr_inst::get_return_type(type *elt_ty, value *ptr, const std::vector<value *> &idx_list) {
   // result pointer type
-  type *ptr_ty = pointer_type::get(get_indexed_type(elt_ty, idx_list), ptr->get_type()->get_pointer_address_space());
+  type *ptr_ty = pointer_type::get(get_indexed_type(elt_ty, idx_list), ptr->get_type()->get_scalar_ty()->get_pointer_address_space());
   // Tile GEP
   if(ptr->get_type()->is_tile_ty())
     return tile_type::get_same_shapes(ptr_ty, ptr->get_type());