[Bugfix] Fix div zero error in rewrite_simplify (apache#8961)

* fix div zero error in rewrite_simplify

* update the style to fix ci error

* remove useless code and comment

Author: Sen Yang

src/arith/rewrite_simplify.cc

@@ -474,6 +474,7 @@ PrimExpr RewriteSimplifier::Impl::VisitExpr_(const DivNode* op) {
     if ((div(ramp(b1, c1, lanes), broadcast(c2, lanes))).Match(ret)) {
       int64_t c1val = c1.Eval()->value;
       int64_t c2val = c2.Eval()->value;
+      ICHECK(c2val != 0) << "division by zero";
       if (c1val % c2val == 0) {
         return ramp(div(b1, c2), div(c1, c2), lanes).Eval();
       }

tests/python/unittest/test_arith_rewrite_simplify.py

@@ -14,6 +14,7 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+import pytest
 import tvm
 from tvm import te
 
@@ -931,20 +932,13 @@ def test_shift_left_simplify():
     ck.verify(z, tvm.tir.const(1 << 10, "int32"))
 
 
+def test_div_zero_simplify():
+    ck = RewriteChecker()
+
+    with pytest.raises(tvm.error.TVMError) as cm:
+        ck.analyzer.rewrite_simplify(tvm.tir.Div(tvm.tir.Ramp(1, 1, 2), tvm.tir.Broadcast(0, 2)))
+        assert "division by zero" in str(cm.execption)
+
+
 if __name__ == "__main__":
-    test_floordiv_index_simplify()
-    test_floormod_index_simplify()
-    test_cmp_simplify()
-    test_vector_simplify()
-    test_add_index_simplify()
-    test_sub_index_simplify()
-    test_mul_index_simplify()
-    test_div_index_simplify()
-    test_max_index_simplify()
-    test_min_index_simplify()
-    test_mod_index_simplify()
-    test_select_simplify()
-    test_logical_simplify()
-    test_let_simplify()
-    test_cast_simplify()
-    test_shift_left_simplify()
+    pytest.main([__file__])