This backport contains 1 patch from gcc main stream tree.
The commit id of these patchs list as following in the order of time.

0001-aarch64-Fix-an-ICE-in-vect_recog_mask_conversion_pattern.patch:
91d80cf4bd2827dd9c40fe6a7c719c909d79083d

diff -Nurp a/gcc/testsuite/gcc.target/aarch64/pr96757.c b/gcc/testsuite/gcc.target/aarch64/pr96757.c
--- a/gcc/testsuite/gcc.target/aarch64/pr96757.c	1969-12-31 19:00:00.000000000 -0500
+++ b/gcc/testsuite/gcc.target/aarch64/pr96757.c	2020-10-12 08:32:12.192000000 -0400
@@ -0,0 +1,23 @@
+/* PR target/96757 */
+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+
+short 
+fun1(short i, short j)
+{ 
+  return i * j; 
+}
+
+int 
+fun(int a, int b, int c) 
+{
+  int *v, z, k, m;
+  short f, d;
+  for (int i=0; i<c; i++) 
+  {
+    f= 4 <= d;
+    k= a > m;
+    z = f > k;
+    *v += fun1(z,b);
+  }
+}
diff -Nurp a/gcc/tree-vect-patterns.c b/gcc/tree-vect-patterns.c
--- a/gcc/tree-vect-patterns.c	2020-10-12 08:05:18.924000000 -0400
+++ b/gcc/tree-vect-patterns.c	2020-10-12 08:50:56.996000000 -0400
@@ -3917,6 +3917,8 @@ vect_recog_mask_conversion_pattern (stmt
   tree vectype1, vectype2;
   stmt_vec_info pattern_stmt_info;
   vec_info *vinfo = stmt_vinfo->vinfo;
+  tree rhs1_op0 = NULL_TREE, rhs1_op1 = NULL_TREE;
+  tree rhs1_op0_type = NULL_TREE, rhs1_op1_type = NULL_TREE;
 
   /* Check for MASK_LOAD ans MASK_STORE calls requiring mask conversion.  */
   if (is_gimple_call (last_stmt)
@@ -4016,9 +4018,37 @@ vect_recog_mask_conversion_pattern (stmt
 
 	     it is better for b1 and b2 to use the mask type associated
 	     with int elements rather bool (byte) elements.  */
-	  rhs1_type = search_type_for_mask (TREE_OPERAND (rhs1, 0), vinfo);
-	  if (!rhs1_type)
-	    rhs1_type = TREE_TYPE (TREE_OPERAND (rhs1, 0));
+	  rhs1_op0 = TREE_OPERAND (rhs1, 0);
+	  rhs1_op1 = TREE_OPERAND (rhs1, 1);
+	  if (!rhs1_op0 || !rhs1_op1)
+	    return NULL;
+	  rhs1_op0_type = search_type_for_mask (rhs1_op0, vinfo);
+	  rhs1_op1_type = search_type_for_mask (rhs1_op1, vinfo);
+
+	  if (!rhs1_op0_type)
+	    rhs1_type = TREE_TYPE (rhs1_op0);
+	  else if (!rhs1_op1_type)
+	    rhs1_type = TREE_TYPE (rhs1_op1);
+	  else if (TYPE_PRECISION (rhs1_op0_type)
+		   != TYPE_PRECISION (rhs1_op1_type))
+	    {
+	      int tmp0 = (int) TYPE_PRECISION (rhs1_op0_type)
+			 - (int) TYPE_PRECISION (TREE_TYPE (lhs));
+	      int tmp1 = (int) TYPE_PRECISION (rhs1_op1_type)
+			 - (int) TYPE_PRECISION (TREE_TYPE (lhs));
+	      if ((tmp0 > 0 && tmp1 > 0) || (tmp0 < 0 && tmp1 < 0))
+		{
+		  if (abs (tmp0) > abs (tmp1))
+		    rhs1_type = rhs1_op1_type;
+		  else
+		    rhs1_type = rhs1_op0_type;
+		}
+	      else
+		rhs1_type = build_nonstandard_integer_type
+		  (TYPE_PRECISION (TREE_TYPE (lhs)), 1);
+	    }
+	  else
+	    rhs1_type = rhs1_op0_type;
 	}
       else
 	return NULL;
@@ -4036,8 +4066,8 @@ vect_recog_mask_conversion_pattern (stmt
 	 name from the outset.  */
       if (known_eq (TYPE_VECTOR_SUBPARTS (vectype1),
 		    TYPE_VECTOR_SUBPARTS (vectype2))
-	  && (TREE_CODE (rhs1) == SSA_NAME
-	      || rhs1_type == TREE_TYPE (TREE_OPERAND (rhs1, 0))))
+	  && !rhs1_op0_type
+	  && !rhs1_op1_type)
 	return NULL;
 
       /* If rhs1 is invariant and we can promote it leave the COND_EXPR
@@ -4069,7 +4099,16 @@ vect_recog_mask_conversion_pattern (stmt
       if (TREE_CODE (rhs1) != SSA_NAME)
 	{
 	  tmp = vect_recog_temp_ssa_var (TREE_TYPE (rhs1), NULL);
-	  pattern_stmt = gimple_build_assign (tmp, rhs1);
+	  if (rhs1_op0_type
+	      && TYPE_PRECISION (rhs1_op0_type) != TYPE_PRECISION (rhs1_type))
+	    rhs1_op0 = build_mask_conversion (rhs1_op0,
+					      vectype2, stmt_vinfo);
+	  if (rhs1_op1_type
+	      && TYPE_PRECISION (rhs1_op1_type) != TYPE_PRECISION (rhs1_type))
+	    rhs1_op1 = build_mask_conversion (rhs1_op1,
+					      vectype2, stmt_vinfo);
+	  pattern_stmt = gimple_build_assign (tmp, TREE_CODE (rhs1),
+			 		      rhs1_op0, rhs1_op1);
 	  rhs1 = tmp;
 	  append_pattern_def_seq (stmt_vinfo, pattern_stmt, vectype2);
 	}