1 files changed, 29 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/divmodsi4.c b/contrib/llvm-project/compiler-rt/lib/builtins/divmodsi4.c
new file mode 100644
index 000000000000..193f81053568
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/divmodsi4.c
@@ -0,0 +1,29 @@
+//===-- divmodsi4.c - Implement __divmodsi4
+//--------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __divmodsi4 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: a / b, *rem = a % b
+
+COMPILER_RT_ABI si_int __divmodsi4(si_int a, si_int b, si_int *rem) {
+  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 = (su_int)(a ^ s_a) - s_a;                          // negate if s_a == -1
+  b = (su_int)(b ^ s_b) - s_b;                          // negate if s_b == -1
+  s_b ^= s_a;                                           // sign of quotient
+  su_int r;
+  si_int q = (__udivmodsi4(a, b, &r) ^ s_b) - s_b;      // negate if s_b == -1
+  *rem = (r ^ s_a) - s_a;                               // negate if s_a == -1
+  return q;
+}