1 files changed, 75 insertions, 0 deletions
diff --git a/src/boost/libs/config/test/boost_has_int128.ipp b/src/boost/libs/config/test/boost_has_int128.ipp
new file mode 100644
index 000000000..b7e10a40c
--- /dev/null
+++ b/src/boost/libs/config/test/boost_has_int128.ipp
@@ -0,0 +1,75 @@
+//  (C) Copyright John Maddock 2012. 
+//  (C) Copyright Dynatrace 2017. 
+//  Use, modification and distribution are subject to the 
+//  Boost Software License, Version 1.0. (See accompanying file 
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+//  See http://www.boost.org/libs/config for most recent version.
+
+//  MACRO:         BOOST_HAS_INT128
+//  TITLE:         __int128
+//  DESCRIPTION:   The platform supports __int128.
+
+#include <cstdlib>
+#include <stdio.h>
+#include <limits.h>
+
+namespace boost_has_int128{
+
+#ifdef __GNUC__
+__extension__ typedef __int128 my_int128_t;
+__extension__ typedef unsigned __int128 my_uint128_t;
+#else
+typedef __int128 my_int128_t;
+typedef unsigned __int128 my_uint128_t;
+#endif
+
+my_uint128_t volatile g_ui128 = 0;
+unsigned long volatile g_ul = 0;
+
+int test()
+{
+   my_int128_t si128 = 0;
+   (void)&si128;
+
+   // Some compilers have seriously broken __int128 implementations, so we need to do a little more than simply check if we can declare variables with __int128...
+   // #1: check __int128 size
+   if (sizeof(my_uint128_t) < (128 / CHAR_BIT))
+   {
+      fputs("Type too small.", stderr);
+      return 1;
+   }
+
+   // #2: check result of computation with __int128
+   my_uint128_t p1 = 1;
+   my_uint128_t p2 = 1;
+   unsigned int i = 0;
+   for (; i < 180; i++)
+   {
+      g_ui128 = p1 + p2;
+      if (g_ui128 < p1)
+      {
+         fputs("Unexpected overflow.", stderr);
+         return 1;
+      }
+      p2 = p1;
+      p1 = g_ui128;
+   }
+
+   g_ul = static_cast<unsigned long>((g_ui128 >> 92) & 0xFFFFFFFFUL);
+   g_ul -= 1216382273UL;
+   if (g_ul != 0)
+   {
+      fputs("Incorrect computation result.", stderr);
+      return 1;
+   }
+
+   return 0;
+}
+
+}
+
+
+
+
+