1 files changed, 31 insertions, 0 deletions
diff --git a/lib/moddi3.c b/lib/moddi3.c
new file mode 100644
index 000000000..5e903914a
--- /dev/null
+++ b/lib/moddi3.c
@@ -0,0 +1,31 @@
+//===-- moddi3.c - Implement __moddi3 -------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __moddi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+du_int __udivmoddi4(du_int a, du_int b, du_int* rem);
+
+// Returns: a % b
+
+di_int
+__moddi3(di_int a, di_int b)
+{
+    const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1;
+    di_int s = b >> bits_in_dword_m1;  // s = b < 0 ? -1 : 0
+    b = (b ^ s) - s;                   // negate if s == -1
+    s = a >> bits_in_dword_m1;         // s = a < 0 ? -1 : 0
+    a = (a ^ s) - s;                   // negate if s == -1
+    di_int r;
+    __udivmoddi4(a, b, (du_int*)&r);
+    return (r ^ s) - s;                // negate if s == -1
+}