compiler_rt: Import aeabi_ldivmode.S file and dependencies
Import aeabi_ldivmod.S with divmoddi4.c and divdi3.c from the
LLVM compiler_rt library on master branch as of 30 Oct 2018
(SVN revision: r345645).
This is to get the __aeabi_ldivmod builtin, which is required
by a patch using signed long long division.
Change-Id: Iee4c421deb3175142655e19074cd3732edd82227
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
diff --git a/lib/compiler-rt/builtins/divdi3.c b/lib/compiler-rt/builtins/divdi3.c
new file mode 100644
index 0000000..b8eebcb
--- /dev/null
+++ b/lib/compiler-rt/builtins/divdi3.c
@@ -0,0 +1,29 @@
+/* ===-- divdi3.c - Implement __divdi3 -------------------------------------===
+ *
+ * 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 __divdi3 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+
+/* Returns: a / b */
+
+COMPILER_RT_ABI 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 */
+}