1 files changed, 39 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/builtins/divsi3.c b/contrib/compiler-rt/lib/builtins/divsi3.c
new file mode 100644
index 000000000000..75aea008ddc1
--- /dev/null
+++ b/contrib/compiler-rt/lib/builtins/divsi3.c
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+/* ===-- divsi3.c - Implement __divsi3 -------------------------------------===
+ *
+ *                     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 __divsi3 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+
+/* Returns: a / b */
+
+COMPILER_RT_ABI si_int
+__divsi3(si_int a, si_int b)
+{
+    const int bits_in_word_m1 = (int)(sizeof(si_int) * CHAR_BIT) - 1;
+    si_int s_a = a >> bits_in_word_m1;           /* s_a = a < 0 ? -1 : 0 */
+    si_int s_b = b >> bits_in_word_m1;           /* s_b = b < 0 ? -1 : 0 */
+    a = (a ^ s_a) - s_a;                         /* negate if s_a == -1 */
+    b = (b ^ s_b) - s_b;                         /* negate if s_b == -1 */
+    s_a ^= s_b;                                  /* sign of quotient */
+    /*
+     * On CPUs without unsigned hardware division support,
+     *  this calls __udivsi3 (notice the cast to su_int).
+     * On CPUs with unsigned hardware division support,
+     *  this uses the unsigned division instruction.
+     */
+    return ((su_int)a/(su_int)b ^ s_a) - s_a;    /* negate if s_a == -1 */
+}
+
+#if defined(__ARM_EABI__)
+AEABI_RTABI si_int __aeabi_idiv(si_int a, si_int b) COMPILER_RT_ALIAS(__divsi3);
+#endif