From df24bd295de672241aeef3da883f3e4b8dd5867d Mon Sep 17 00:00:00 2001
From: HAN Liutong <liutong2020@iscas.ac.cn>
Date: Fri, 23 Sep 2022 11:28:50 +0000
Subject: [PATCH] Fix v_signmask for RISC-V Vector.

---
 modules/core/include/opencv2/core/hal/intrin_rvv_scalable.hpp | 2 +-
 modules/core/test/test_intrin_utils.hpp                       | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/core/include/opencv2/core/hal/intrin_rvv_scalable.hpp b/modules/core/include/opencv2/core/hal/intrin_rvv_scalable.hpp
index 463c010d71..d34aa65c4a 100644
--- a/modules/core/include/opencv2/core/hal/intrin_rvv_scalable.hpp
+++ b/modules/core/include/opencv2/core/hal/intrin_rvv_scalable.hpp
@@ -1618,7 +1618,7 @@ inline int v_signmask(const _Tpvec& a) \
 { \
     uint8_t ans[4] = {0}; \
     vsm(ans, vmslt(a, 0, VTraits<_Tpvec>::vlanes()), VTraits<_Tpvec>::vlanes()); \
-    return *(reinterpret_cast<int*>(ans)); \
+    return *(reinterpret_cast<int*>(ans)) & (((__int128_t)1 << VTraits<_Tpvec>::vlanes()) - 1); \
 } \
 inline int v_scan_forward(const _Tpvec& a) \
 { \
diff --git a/modules/core/test/test_intrin_utils.hpp b/modules/core/test/test_intrin_utils.hpp
index c1db4f49a5..2685d6ac55 100644
--- a/modules/core/test/test_intrin_utils.hpp
+++ b/modules/core/test/test_intrin_utils.hpp
@@ -1081,6 +1081,7 @@ template<typename R> struct TheTest
         typedef typename VTraits<uint_reg>::lane_type uint_type;
 
         Data<R> dataA, dataB(0), dataC, dataD(1), dataE(2);
+        dataA[0] = std::numeric_limits<int_type>::max();
         dataA[1] *= (LaneType)-1;
         union
         {