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| author | ed <ed@FreeBSD.org> | 2011-12-27 22:13:51 +0000 |
|---|---|---|
| committer | ed <ed@FreeBSD.org> | 2011-12-27 22:13:51 +0000 |
| commit | 52306b41a65349c9fb64a1e03d2b593af6927dbd (patch) | |
| tree | 55052b5fbd1048f4b1c9e2fdcd09939c5337b577 /lib/libcompiler_rt/__sync_fetch_and_add_4.c | |
| parent | c8ed04c26b6758354853a6bed4629f71d0d01a7d (diff) | |
| download | FreeBSD-src-52306b41a65349c9fb64a1e03d2b593af6927dbd.zip FreeBSD-src-52306b41a65349c9fb64a1e03d2b593af6927dbd.tar.gz | |
Add locally implemented atomic intrinsics to libcompiler_rt.
The built-in atomic operations are not implemented in our version of GCC
4.2 for the ARM and MIPS architectures. Instead of emitting locked
instructions, they generate calls to functions that can be implemented
in the C runtime.
Only implement the atomic operations that are used by <stdatomic.h> for
datatype sizes that are supported by atomic(9). This means that on these
architectures, we can only use atomic operations on 32-bits and 64-bits
variables, which is typically sufficient.
This makes <stdatomic.h> work on all architectures except MIPS, since
MIPS and SPARC64 still use libgcc. Converting these architectures to
libcompiler_rt is on my todo list.
Diffstat (limited to 'lib/libcompiler_rt/__sync_fetch_and_add_4.c')
| -rw-r--r-- | lib/libcompiler_rt/__sync_fetch_and_add_4.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/libcompiler_rt/__sync_fetch_and_add_4.c b/lib/libcompiler_rt/__sync_fetch_and_add_4.c new file mode 100644 index 0000000..3c11a3b --- /dev/null +++ b/lib/libcompiler_rt/__sync_fetch_and_add_4.c @@ -0,0 +1,6 @@ +/* $FreeBSD$ */ +#define NAME __sync_fetch_and_add_4 +#define TYPE uint32_t +#define FETCHADD(x, y) atomic_fetchadd_32(x, y) + +#include "__sync_fetch_and_op_n.h" |
