fold-const.c (fold_unary_loc): Handle REDUC_MIN_EXPR, REDUC_MAX_EXPR and REDUC_PLUS_EXPR.

	* fold-const.c (fold_unary_loc): Handle REDUC_MIN_EXPR,
	REDUC_MAX_EXPR and REDUC_PLUS_EXPR.

From-SVN: r192376

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9ddad1bd4a3d65d13a9a24385883f5de9f1e0b29..a4bc0e417f524ec14ec04e75b131de86a21ef04f 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2012-10-11  Jakub Jelinek  <jakub@redhat.com>
+
+       * fold-const.c (fold_unary_loc): Handle REDUC_MIN_EXPR,
+       REDUC_MAX_EXPR and REDUC_PLUS_EXPR.
+
 2012-10-11  James Lemke  <jwlemke@codesourcery.com>
 
        * config/rs6000/predicates.md (zero_fp_constant): Fix comment.

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 99655a1df9c5e63694cd57188c0a3a04783a3dd5..b1d811d3548fa4fcb8c90492b23d6a197ea14964 100644 (file)
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -8294,6 +8294,40 @@ fold_unary_loc (location_t loc, enum tree_code code, tree type, tree op0)
        return build_vector (type, elts);
       }
 
+    case REDUC_MIN_EXPR:
+    case REDUC_MAX_EXPR:
+    case REDUC_PLUS_EXPR:
+      {
+       unsigned int nelts = TYPE_VECTOR_SUBPARTS (type), i;
+       tree *elts;
+       enum tree_code subcode;
+
+       if (TREE_CODE (op0) != VECTOR_CST)
+         return NULL_TREE;
+
+       elts = XALLOCAVEC (tree, nelts);
+       if (!vec_cst_ctor_to_array (op0, elts))
+         return NULL_TREE;
+
+       switch (code)
+         {
+         case REDUC_MIN_EXPR: subcode = MIN_EXPR; break;
+         case REDUC_MAX_EXPR: subcode = MAX_EXPR; break;
+         case REDUC_PLUS_EXPR: subcode = PLUS_EXPR; break;
+         default: gcc_unreachable ();
+         }
+
+       for (i = 1; i < nelts; i++)
+         {
+           elts[0] = const_binop (subcode, elts[0], elts[i]);
+           if (elts[0] == NULL_TREE || !CONSTANT_CLASS_P (elts[0]))
+             return NULL_TREE;
+           elts[i] = build_zero_cst (TREE_TYPE (type));
+         }
+
+       return build_vector (type, elts);
+      }
+
     default:
       return NULL_TREE;
     } /* switch (code) */