diff --git a/modules/core/include/opencv2/core/hal/intrin_lsx.hpp b/modules/core/include/opencv2/core/hal/intrin_lsx.hpp
index 4e3d2319ad..ef83a2e466 100644
--- a/modules/core/include/opencv2/core/hal/intrin_lsx.hpp
+++ b/modules/core/include/opencv2/core/hal/intrin_lsx.hpp
@@ -860,6 +860,7 @@ class v_lsx_palignr_u8_class<imm, false, true, false, false, false>
 public:
     inline __m128i operator()(const __m128i& a, const __m128i& b) const
     {
+        CV_UNUSED(b);
         return a;
     }
 };
@@ -880,6 +881,7 @@ class v_lsx_palignr_u8_class<imm, false, false, false, true, false>
 public:
     inline __m128i operator()(const __m128i& a, const __m128i& b) const
     {
+        CV_UNUSED(a);
         return b;
     }
 };
diff --git a/modules/dnn/src/layers/cpu_kernels/fast_gemm_kernels.simd.hpp b/modules/dnn/src/layers/cpu_kernels/fast_gemm_kernels.simd.hpp
index 8e63d15137..39bf6800d7 100644
--- a/modules/dnn/src/layers/cpu_kernels/fast_gemm_kernels.simd.hpp
+++ b/modules/dnn/src/layers/cpu_kernels/fast_gemm_kernels.simd.hpp
@@ -313,8 +313,7 @@ static inline void fast_gemm12x16_f32(int k, const char *a_, const char *b_, cha
     const float* b = (const float*)b_;
     float* c = (float*)c_;
 
-    __m256i dummy;
-    __m256 s00  = (__m256)__lasx_xvxor_v(dummy, dummy), s01  = s00,
+    __m256 s00  = _v256_setall_ps(0), s01  = s00,
            s10  = s00, s11  = s00,
            s20  = s00, s21  = s00,
            s30  = s00, s31  = s00,