diff --git a/gcc/ipa-prop.c b/gcc/ipa-prop.c
index 3150bd6..d117389 100644
--- a/gcc/ipa-prop.c
+++ b/gcc/ipa-prop.c
@@ -2956,15 +2956,17 @@ ipa_modify_call_arguments (struct cgraph_edge *cs, gimple stmt,
 	      unsigned int align;
 	      unsigned HOST_WIDE_INT misalign;
 
-	      get_pointer_alignment_1 (base, &align, &misalign);
-	      misalign += (tree_to_double_int (off)
-			   .sext (TYPE_PRECISION (TREE_TYPE (off))).low
-			   * BITS_PER_UNIT);
-	      misalign = misalign & (align - 1);
-	      if (misalign != 0)
-		align = (misalign & -misalign);
-	      if (align < TYPE_ALIGN (type))
-		type = build_aligned_type (type, align);
+	      if (get_pointer_alignment_1 (base, &align, &misalign))
+		{
+		  misalign += (tree_to_double_int (off)
+			       .sext (TYPE_PRECISION (TREE_TYPE (off))).low
+			       * BITS_PER_UNIT);
+	          misalign = misalign & (align - 1);
+	          if (misalign != 0)
+		    align = (misalign & -misalign);
+		  if (align < TYPE_ALIGN (type))
+		    type = build_aligned_type (type, align);
+		}
 	      expr = fold_build2_loc (loc, MEM_REF, type, base, off);
 	    }
 	  else