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4 Commits

Author SHA1 Message Date
Jonathan Gray f12c107b03 util/u_atomic: fix build on clang archs without 64-bit atomics 
Make this build on clang architectures that don't have 64-bit atomic
instructions.  Clang doesn't allow redeclaration (and therefore
redefinition) of the __sync_* builtins.  Use #pragma redefine_extname
to work around that restriction.  Clang also turns __sync_add_and_fetch
into __sync_fetch_and_add (and __sync_sub_and_fetch into
__sync_fetch_and_sub) in certain cases, so provide these functions as
well.

Fixes: a6a38a038b ("util/u_atomic: provide 64bit atomics where they're missing")
patch from Mark Kettenis

Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6511>
 2022-02-28 14:28:23 +00:00
Grazvydas Ignotas 16e884d9e3 util/u_atomic: remove unnecessaty __atomic functions 
They are now provided by -latomic, which should be linked as needed
since previous commit.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
 2017-09-22 17:12:24 +03:00
Matt Turner 1bbe180873 util/u_atomic: Add implementation of __sync_val_compare_and_swap_8 
Needed for 32-bit PowerPC.

Cc: "17.2" <mesa-stable@lists.freedesktop.org>
Fixes: a6a38a038b ("util/u_atomic: provide 64bit atomics where
they're missing")
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
 2017-09-15 09:37:30 -07:00
Grazvydas Ignotas a6a38a038b util/u_atomic: provide 64bit atomics where they're missing 
There are still some distributions trying to support unfortunate people
with old or exotic CPUs that don't have 64bit atomic operations. When
compiling for such a machine, gcc conveniently inserts a library call to
a helper, but it's implementation is missing and we get a linker error.
This allows us to provide our own implementation, which is marked weak
to prefer a better implementation, should one exist.

v2: changed copyright, some style adjustments
v3: [mattst88] Print results with AC_MSG_CHECKING/AC_MSG_RESULT

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93089
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
 2017-04-03 10:52:41 -07:00