1 files changed, 50 insertions, 0 deletions
diff --git a/libgo/runtime/go-type-identity.c b/libgo/runtime/go-type-identity.c
new file mode 100644
index 000000000..f1de3c28a
--- /dev/null
+++ b/libgo/runtime/go-type-identity.c
@@ -0,0 +1,50 @@
+/* go-type-identity.c -- hash and equality identity functions.
+
+   Copyright 2009 The Go Authors. All rights reserved.
+   Use of this source code is governed by a BSD-style
+   license that can be found in the LICENSE file.  */
+
+#include <stddef.h>
+
+#include "go-type.h"
+
+/* Typedefs for accesses of different sizes.  */
+
+typedef int QItype __attribute__ ((mode (QI)));
+typedef int HItype __attribute__ ((mode (HI)));
+typedef int SItype __attribute__ ((mode (SI)));
+typedef int DItype __attribute__ ((mode (DI)));
+
+/* An identity hash function for a type.  This is used for types where
+   we can simply use the type value itself as a hash code.  This is
+   true of, e.g., integers and pointers.  */
+
+size_t
+__go_type_hash_identity (const void *key, size_t key_size)
+{
+  switch (key_size)
+    {
+    case 1:
+      return *(const QItype *) key;
+    case 2:
+      return *(const HItype *) key;
+    case 3:
+    case 4:
+    case 5:
+    case 6:
+    case 7:
+      return *(const SItype *) key;
+    default:
+      return *(const DItype *) key;
+    }
+}
+
+/* An identity equality function for a type.  This is used for types
+   where we can check for equality by checking that the values have
+   the same bits.  */
+
+_Bool
+__go_type_equal_identity (const void *k1, const void *k2, size_t key_size)
+{
+  return __builtin_memcmp (k1, k2, key_size) == 0;
+}