Initial import of compiler-rt.

 -


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@74292 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 30 insertions, 0 deletions

diff --git a/lib/divdi3.c b/lib/divdi3.c
new file mode 100644
index 000000000..9580156b9
--- /dev/null
+++ b/lib/divdi3.c
@@ -0,0 +1,30 @@
+//===-- divdi3.c - Implement __divdi3 -------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __divdi3 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
+__divdi3(di_int a, di_int b)
+{
+    const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1;
+    di_int s_a = a >> bits_in_dword_m1;           // s_a = a < 0 ? -1 : 0
+    di_int s_b = b >> bits_in_dword_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
+    return (__udivmoddi4(a, b, (du_int*)0) ^ s_a) - s_a;  // negate if s_a == -1
+}