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authorSandrine Bailleux <sandrine.bailleux@arm.com>2018-10-31 13:37:42 +0100
committerSandrine Bailleux <sandrine.bailleux@arm.com>2018-11-06 15:42:51 +0100
commit638d2b5141193e08e22f1aecb592396dbf05856d (patch)
tree9d4029c0ee015067a88e443c453335e4510d7127 /lib/compiler-rt
parentecc35992f3a996420f98a268a11959a6656fd02d (diff)
downloadtrusted-firmware-a-638d2b5141193e08e22f1aecb592396dbf05856d.tar.gz
compiler_rt: Import lshrdi3.c file
Imported from the LLVM compiler_rt library on master branch as of 30 Oct 2018 (SVN revision: r345645). This is to get the __aeabi_llsr() builtin, which is required by a subsequent patch that uses a logical right shift operator in AArch32. Change-Id: I9884139a12855a8a87206fb572aaa7dd35582b09 Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
Diffstat (limited to 'lib/compiler-rt')
-rw-r--r--lib/compiler-rt/builtins/lshrdi3.c45
-rw-r--r--lib/compiler-rt/compiler-rt.mk3
2 files changed, 47 insertions, 1 deletions
diff --git a/lib/compiler-rt/builtins/lshrdi3.c b/lib/compiler-rt/builtins/lshrdi3.c
new file mode 100644
index 0000000000..67b2a76683
--- /dev/null
+++ b/lib/compiler-rt/builtins/lshrdi3.c
@@ -0,0 +1,45 @@
+/* ===-- lshrdi3.c - Implement __lshrdi3 -----------------------------------===
+ *
+ * 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 __lshrdi3 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+
+/* Returns: logical a >> b */
+
+/* Precondition: 0 <= b < bits_in_dword */
+
+COMPILER_RT_ABI di_int
+__lshrdi3(di_int a, si_int b)
+{
+ const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT);
+ udwords input;
+ udwords result;
+ input.all = a;
+ if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */
+ {
+ result.s.high = 0;
+ result.s.low = input.s.high >> (b - bits_in_word);
+ }
+ else /* 0 <= b < bits_in_word */
+ {
+ if (b == 0)
+ return a;
+ result.s.high = input.s.high >> b;
+ result.s.low = (input.s.high << (bits_in_word - b)) | (input.s.low >> b);
+ }
+ return result.all;
+}
+
+#if defined(__ARM_EABI__)
+AEABI_RTABI di_int __aeabi_llsr(di_int a, si_int b) COMPILER_RT_ALIAS(__lshrdi3);
+#endif
diff --git a/lib/compiler-rt/compiler-rt.mk b/lib/compiler-rt/compiler-rt.mk
index cb5ab31c05..49e497eb83 100644
--- a/lib/compiler-rt/compiler-rt.mk
+++ b/lib/compiler-rt/compiler-rt.mk
@@ -31,5 +31,6 @@
ifeq (${ARCH},aarch32)
COMPILER_RT_SRCS := lib/compiler-rt/builtins/arm/aeabi_uldivmod.S \
lib/compiler-rt/builtins/udivmoddi4.c \
- lib/compiler-rt/builtins/ctzdi2.c
+ lib/compiler-rt/builtins/ctzdi2.c \
+ lib/compiler-rt/builtins/lshrdi3.c
endif