diff --git a/tests/impl.cpp b/tests/impl.cpp
index ee7e85ee..594009d5 100644
--- a/tests/impl.cpp
+++ b/tests/impl.cpp
@@ -18882,22 +18882,28 @@ result_t test_vrecpe_f32(const NEON2RVV_TEST_IMPL &impl, uint32_t iter) {
 }
 
 result_t test_vrecpe_u32(const NEON2RVV_TEST_IMPL &impl, uint32_t iter) {
+  // refer: https://community.arm.com/support-forums/f/armds-forum/930/division-with-neon
+  // https://www.cnblogs.com/pepetang/p/7777243.html
   const uint32_t *_a = (const uint32_t *)impl.test_cases_int_pointer1;
   uint32_t _c[2];
-  const uint32_t sign_bit = 0x80000000;
-  const uint32_t input_lower_bound = 0x80000000, input_upper_bound = UINT32_MAX;
-  const uint32_t estimate_lower_bound = 0x80000000, estimate_upper_bound = 0xff800000;
-  const uint32_t input_range = input_upper_bound - input_lower_bound;
-  const uint32_t estimate_range = estimate_upper_bound - estimate_lower_bound;
-  for (int i = 0; i < 2; i++) {
-    if (!(_a[i] & sign_bit)) {
-      _c[i] = UINT32_MAX;
-    } else {
-      uint32_t diff = UINT32_MAX - _a[i];
-      _c[i] = (diff / (input_range) * (estimate_range) + estimate_lower_bound);
-    }
+  // const uint32_t sign_bit = 0x80000000;
+  // const uint32_t input_lower_bound = 0x80000000, input_upper_bound = UINT32_MAX;
+  // const uint32_t estimate_lower_bound = 0x80000000, estimate_upper_bound = 0xff800000;
+  // const uint32_t input_range = input_upper_bound - input_lower_bound;
+  // const uint32_t estimate_range = estimate_upper_bound - estimate_lower_bound;
+  // for (int i = 0; i < 2; i++) {
+  //   if (!(_a[i] & sign_bit)) {
+  //     _c[i] = UINT32_MAX;
+  //   } else {
+  //     uint32_t diff = UINT32_MAX - _a[i];
+  //     _c[i] = (diff / (input_range) * (estimate_range) + estimate_lower_bound);
+  //   }
+  // }
+  for (int i = 0; i < 2; i++) {
+  x_normalized = x << 
   }
 
+
   uint32x2_t a = vld1_u32(_a);
   uint32x2_t c = vrecpe_u32(a);
   // print_u32_64("_a", _a);