1 files changed, 97 insertions, 0 deletions
diff --git a/gcc/builtins.c b/gcc/builtins.c
index 1ca5b5d..fcb6a7a 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -2520,3 +2520,100 @@ expand_builtin (exp, target, subtarget, mode, ignore)
      to be called normally.  */
   return expand_call (exp, target, ignore);
 }
+
+/* Recognize certain built-in functions so we can make tree-codes
+   other than CALL_EXPR.  We do this when it enables fold-const.c
+   to do something useful.  */
+
+tree
+expand_tree_builtin (function, params, coerced_params)
+     tree function, params, coerced_params;
+{
+  enum tree_code code;
+
+  if (DECL_BUILT_IN_CLASS (function) != BUILT_IN_NORMAL)
+    return NULL_TREE;
+
+  switch (DECL_FUNCTION_CODE (function))
+    {
+    case BUILT_IN_ABS:
+    case BUILT_IN_LABS:
+    case BUILT_IN_FABS:
+      if (coerced_params == 0)
+	return integer_zero_node;
+      return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0);
+
+    case BUILT_IN_ISGREATER:
+      if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
+	code = UNLE_EXPR;
+      else
+	code = LE_EXPR;
+      goto unordered_cmp;
+
+    case BUILT_IN_ISGREATEREQUAL:
+      if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
+	code = UNLT_EXPR;
+      else
+	code = LT_EXPR;
+      goto unordered_cmp;
+
+    case BUILT_IN_ISLESS:
+      if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
+	code = UNGE_EXPR;
+      else
+	code = GE_EXPR;
+      goto unordered_cmp;
+
+    case BUILT_IN_ISLESSEQUAL:
+      if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
+	code = UNGT_EXPR;
+      else
+	code = GT_EXPR;
+      goto unordered_cmp;
+
+    case BUILT_IN_ISLESSGREATER:
+      if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
+	code = UNEQ_EXPR;
+      else
+	code = EQ_EXPR;
+      goto unordered_cmp;
+
+    case BUILT_IN_ISUNORDERED:
+      if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
+	return integer_zero_node;
+      code = UNORDERED_EXPR;
+      goto unordered_cmp;
+
+    unordered_cmp:
+      {
+	tree arg0, arg1;
+
+	if (params == 0
+	    || TREE_CHAIN (params) == 0)
+	  {
+	    error ("too few arguments to function `%s'",
+		   IDENTIFIER_POINTER (DECL_NAME (function)));
+	    return error_mark_node;
+	  }
+	else if (TREE_CHAIN (TREE_CHAIN (params)) != 0)
+	  {
+	    error ("too many arguments to function `%s'",
+		   IDENTIFIER_POINTER (DECL_NAME (function)));
+	    return error_mark_node;
+	  }
+
+	arg0 = TREE_VALUE (params);
+	arg1 = TREE_VALUE (TREE_CHAIN (params));
+	arg0 = build_binary_op (code, arg0, arg1, 0);
+	if (code != UNORDERED_EXPR)
+	  arg0 = build_unary_op (TRUTH_NOT_EXPR, arg0, 0);
+	return arg0;
+      }
+      break;
+
+    default:
+      break;
+    }
+
+  return NULL_TREE;
+}