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diff --git a/lib/umodti3.c b/lib/umodti3.c
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+//===-- umodti3.c - Implement __umodti3 -----------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __umodti3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#if __x86_64
+
+#include "int_lib.h"
+
+tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem);
+
+// Returns: a % b
+
+tu_int
+__umodti3(tu_int a, tu_int b)
+{
+ tu_int r;
+ __udivmodti4(a, b, &r);
+ return r;
+}
+
+#endif