No a*x+b*x factorization for signed vectors

2018-10-02  Marc Glisse  <marc.glisse@inria.fr>

	PR middle-end/87319
	* fold-const.c (fold_plusminus_mult_expr): Handle complex and vectors.
	* tree.c (signed_or_unsigned_type_for): Handle complex.

From-SVN: r264790

gcc/ChangeLog

+2018-10-02  Marc Glisse  <marc.glisse@inria.fr>
+
+	PR middle-end/87319
+	* fold-const.c (fold_plusminus_mult_expr): Handle complex and vectors.
+	* tree.c (signed_or_unsigned_type_for): Handle complex.
+
 2018-10-02  Jeff Law  <law@redhat.com>
 
 	* gimple-fold.c (get_range_strlen): Remove dead code.

gcc/fold-const.c

@@ -7143,7 +7143,7 @@ fold_plusminus_mult_expr (location_t loc, enum tree_code code, tree type,
   if (!same)
     return NULL_TREE;
 
-  if (! INTEGRAL_TYPE_P (type)
+  if (! ANY_INTEGRAL_TYPE_P (type)
       || TYPE_OVERFLOW_WRAPS (type)
       /* We are neither factoring zero nor minus one.  */
       || TREE_CODE (same) == INTEGER_CST)

gcc/tree.c

@@ -11209,7 +11209,7 @@ int_cst_value (const_tree x)
 tree
 signed_or_unsigned_type_for (int unsignedp, tree type)
 {
-  if (TREE_CODE (type) == INTEGER_TYPE && TYPE_UNSIGNED (type) == unsignedp)
+  if (ANY_INTEGRAL_TYPE_P (type) && TYPE_UNSIGNED (type) == unsignedp)
     return type;
 
   if (TREE_CODE (type) == VECTOR_TYPE)
@@ -11223,6 +11223,17 @@ signed_or_unsigned_type_for (int unsignedp, tree type)
       return build_vector_type (inner2, TYPE_VECTOR_SUBPARTS (type));
     }
 
+  if (TREE_CODE (type) == COMPLEX_TYPE)
+    {
+      tree inner = TREE_TYPE (type);
+      tree inner2 = signed_or_unsigned_type_for (unsignedp, inner);
+      if (!inner2)
+	return NULL_TREE;
+      if (inner == inner2)
+	return type;
+      return build_complex_type (inner2);
+    }
+
   if (!INTEGRAL_TYPE_P (type)
       && !POINTER_TYPE_P (type)
       && TREE_CODE (type) != OFFSET_TYPE)