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-rw-r--r--lib/builtins/negvti2.c32
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diff --git a/lib/builtins/negvti2.c b/lib/builtins/negvti2.c
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+/*===-- negvti2.c - Implement __negvti2 -----------------------------------===
+ *
+ * The LLVM Compiler Infrastructure
+ *
+ * This file is dual licensed under the MIT and the University of Illinois Open
+ * Source Licenses. See LICENSE.TXT for details.
+ *
+ *===----------------------------------------------------------------------===
+ *
+ *This file implements __negvti2 for the compiler_rt library.
+ *
+ *===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+
+#ifdef CRT_HAS_128BIT
+
+/* Returns: -a */
+
+/* Effects: aborts if -a overflows */
+
+COMPILER_RT_ABI ti_int
+__negvti2(ti_int a)
+{
+ const ti_int MIN = (ti_int)1 << ((int)(sizeof(ti_int) * CHAR_BIT)-1);
+ if (a == MIN)
+ compilerrt_abort();
+ return -a;
+}
+
+#endif /* CRT_HAS_128BIT */