diff --git a/kernel/mips/cgemv_n_msa.c b/kernel/mips/cgemv_n_msa.c
index 12fa7ca02..c1eb9bbfd 100644
--- a/kernel/mips/cgemv_n_msa.c
+++ b/kernel/mips/cgemv_n_msa.c
@@ -56,11 +56,11 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     #if !defined(XCONJ)
         #define OP0  +=
         #define OP1  -=
-        #define OP2  -=
+        #define OP2  +=
     #else
         #define OP0  -=
         #define OP1  -=
-        #define OP2  +=
+        #define OP2  -=
     #endif
 #endif
 
diff --git a/kernel/mips/cgemv_t_msa.c b/kernel/mips/cgemv_t_msa.c
index 584e3de75..800667b6e 100644
--- a/kernel/mips/cgemv_t_msa.c
+++ b/kernel/mips/cgemv_t_msa.c
@@ -32,14 +32,26 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #undef OP1
 #undef OP2
 
-#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
-    #define OP0  -=
-    #define OP1  +=
-    #define OP2  +=
+#if !defined(CONJ)
+    #if !defined(XCONJ)
+        #define OP0  -=
+        #define OP1  +=
+        #define OP2  +=
+    #else
+        #define OP0  +=
+        #define OP1  +=
+        #define OP2  -=
+    #endif
 #else
-    #define OP0  +=
-    #define OP1  +=
-    #define OP2  -=
+    #if !defined(XCONJ)
+        #define OP0  +=
+        #define OP1  -=
+        #define OP2  +=
+    #else
+        #define OP0  -=
+        #define OP1  -=
+        #define OP2  -=
+    #endif
 #endif
 
 #define CGEMV_T_8x4()                        \
diff --git a/kernel/mips/dswap_msa.c b/kernel/mips/dswap_msa.c
index 7b1f02477..67e97f710 100644
--- a/kernel/mips/dswap_msa.c
+++ b/kernel/mips/dswap_msa.c
@@ -184,7 +184,7 @@ int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT dummy3,
             }
         }
     }
-    else
+    else if ((inc_x != 0) && (inc_y != 0))
     {
         for (i = (n >> 3); i--;)
         {
@@ -248,6 +248,32 @@ int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT dummy3,
             }
         }
     }
-
+    else
+    {
+        if (inc_x == inc_y)
+        {
+            if (n & 1)
+            {
+                x0 = *srcx;
+                *srcx  = *srcy;
+                *srcy  = x0;
+            }
+            else
+                return (0);
+        }
+        else
+        {
+            BLASLONG ix = 0, iy = 0;
+            while (i < n)
+            {
+                x0 = srcx[ix];
+                srcx[ix] = srcy[iy];
+                srcy[iy] = x0;
+                ix += inc_x;
+                iy += inc_y;
+                i++;
+            }
+        }
+    }
     return (0);
 }
diff --git a/kernel/mips/sswap_msa.c b/kernel/mips/sswap_msa.c
index 46fa8aa87..d412285b0 100644
--- a/kernel/mips/sswap_msa.c
+++ b/kernel/mips/sswap_msa.c
@@ -198,7 +198,7 @@ int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT dummy3,
             }
         }
     }
-    else
+    else if ((inc_x != 0) && (inc_y != 0))
     {
         for (i = (n >> 3); i--;)
         {
@@ -262,6 +262,33 @@ int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT dummy3,
             }
         }
     }
+    else
+    {
+        if (inc_x == inc_y)
+        {
+            if (n & 1)
+            {
+                x0 = *srcx;
+                *srcx  = *srcy;
+                *srcy  = x0;
+            }
+            else
+                return (0);
+        }
+        else
+        {
+            BLASLONG ix = 0, iy = 0;
+            while (i < n)
+            {
+                x0 = srcx[ix];
+                srcx[ix] = srcy[iy];
+                srcy[iy] = x0;
+                ix += inc_x;
+                iy += inc_y;
+                i++;
+            }
+        }
+    }
 
     return (0);
 }
diff --git a/kernel/mips/zgemv_n_msa.c b/kernel/mips/zgemv_n_msa.c
index 669c25758..97a80b4ba 100644
--- a/kernel/mips/zgemv_n_msa.c
+++ b/kernel/mips/zgemv_n_msa.c
@@ -56,11 +56,11 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     #if !defined(XCONJ)
         #define OP0  +=
         #define OP1  -=
-        #define OP2  -=
+        #define OP2  +=
     #else
         #define OP0  -=
         #define OP1  -=
-        #define OP2  +=
+        #define OP2  -=
     #endif
 #endif
 
diff --git a/kernel/mips/zgemv_t_msa.c b/kernel/mips/zgemv_t_msa.c
index e6febb577..6492f90be 100644
--- a/kernel/mips/zgemv_t_msa.c
+++ b/kernel/mips/zgemv_t_msa.c
@@ -34,14 +34,26 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #undef OP3
 #undef OP4
 
-#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
-    #define OP0  -=
-    #define OP1  +=
-    #define OP2  +=
+#if !defined(CONJ)
+    #if !defined(XCONJ)
+        #define OP0  -=
+        #define OP1  +=
+        #define OP2  +=
+    #else
+        #define OP0  +=
+        #define OP1  +=
+        #define OP2  -=
+    #endif
 #else
-    #define OP0  +=
-    #define OP1  +=
-    #define OP2  -=
+    #if !defined(XCONJ)
+        #define OP0  +=
+        #define OP1  -=
+        #define OP2  +=
+    #else
+        #define OP0  -=
+        #define OP1  -=
+        #define OP2  -=
+    #endif
 #endif
 
 #define ZGEMV_T_8x1()                     \