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author | Sandrine Bailleux <sandrine.bailleux@arm.com> | 2017-07-19 14:05:47 +0100 |
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committer | Sandrine Bailleux <sandrine.bailleux@arm.com> | 2017-07-26 09:28:23 +0100 |
commit | 7bba6884a0112ec38ad5992b1eb3f0398abf5cf7 (patch) | |
tree | f0e39510295229629e20c83950423eae94e4071f /lib/compiler-rt/builtins | |
parent | 347621bb476843fd977c6dce37718cf3bd47bc3f (diff) | |
download | trusted-firmware-a-7bba6884a0112ec38ad5992b1eb3f0398abf5cf7.tar.gz |
Import ctzdi2.c from LLVM compiler-rt
When using __builtin_ctzll() in AArch32 code, the compiler may translate
that into a call to the __ctzdi2() function. In this case, the linking
phase fails because TF doesn't provide an implementation for it.
This patch imports the implementation of the __ctzdi2() function from
LLVM's compiler-rt project and hooks it into TF's build system. The
ctzdi2.c file is an unmodified copy from the master branch as of
July 19 2017 (SVN revision: 308480).
Change-Id: I96766a025ba28e1afc6ef6a5c4ef91d85fc8f32b
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
Diffstat (limited to 'lib/compiler-rt/builtins')
-rw-r--r-- | lib/compiler-rt/builtins/ctzdi2.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/lib/compiler-rt/builtins/ctzdi2.c b/lib/compiler-rt/builtins/ctzdi2.c new file mode 100644 index 0000000000..db3c6fdc08 --- /dev/null +++ b/lib/compiler-rt/builtins/ctzdi2.c @@ -0,0 +1,29 @@ +/* ===-- ctzdi2.c - Implement __ctzdi2 -------------------------------------=== + * + * 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 __ctzdi2 for the compiler_rt library. + * + * ===----------------------------------------------------------------------=== + */ + +#include "int_lib.h" + +/* Returns: the number of trailing 0-bits */ + +/* Precondition: a != 0 */ + +COMPILER_RT_ABI si_int +__ctzdi2(di_int a) +{ + dwords x; + x.all = a; + const si_int f = -(x.s.low == 0); + return __builtin_ctz((x.s.high & f) | (x.s.low & ~f)) + + (f & ((si_int)(sizeof(si_int) * CHAR_BIT))); +} |