diff --git a/gcc/builtins.def b/gcc/builtins.def
index 17f825da367..70640a53347 100644
--- a/gcc/builtins.def
+++ b/gcc/builtins.def
@@ -563,6 +563,7 @@ DEF_C99_BUILTIN        (BUILT_IN_RINTL, "rintl", BT_FN_LONGDOUBLE_LONGDOUBLE, AT
 DEF_EXT_LIB_FLOATN_NX_BUILTINS (BUILT_IN_RINT, "rint", RINT_TYPE, ATTR_CONST_NOTHROW_LEAF_LIST)
 #undef RINT_TYPE
 DEF_C99_BUILTIN        (BUILT_IN_ROUND, "round", BT_FN_DOUBLE_DOUBLE, ATTR_CONST_NOTHROW_LEAF_LIST)
+DEF_C11_BUILTIN        (BUILT_IN_ROUNDEVEN, "roundeven", BT_FN_DOUBLE_DOUBLE, ATTR_CONST_NOTHROW_LEAF_LIST)
 DEF_C99_BUILTIN        (BUILT_IN_ROUNDF, "roundf", BT_FN_FLOAT_FLOAT, ATTR_CONST_NOTHROW_LEAF_LIST)
 DEF_C99_BUILTIN        (BUILT_IN_ROUNDL, "roundl", BT_FN_LONGDOUBLE_LONGDOUBLE, ATTR_CONST_NOTHROW_LEAF_LIST)
 #define ROUND_TYPE(F) BT_FN_##F##_##F
diff --git a/gcc/match.pd b/gcc/match.pd
index 5ba1304af4e..fd77349ed55 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -4686,3 +4686,9 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
 	|| wi::geu_p (wi::to_wide (@rpos),
 		      wi::to_wide (@ipos) + isize))
     (BIT_FIELD_REF @0 @rsize @rpos)))))
+(simplify
+  (BUILT_IN_ROUNDEVEN real_zerop@0)
+  { build_zero_cst (TREE_TYPE(@0)); })