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| author | Ramana Radhakrishnan <ramana.radhakrishnan@arm.com> | 2015-06-04 09:19:51 +0000 |
|---|---|---|
| committer | Ramana Radhakrishnan <ramana@gcc.gnu.org> | 2015-06-04 09:19:51 +0000 |
| commit | e93ca5cadeb71a04b2f8ef2ebcbadb2f0213d878 (patch) | |
| tree | b1f66152fa773d5b7dac557924b8c752070f198e /gcc/config/sparc/linux64.h | |
| parent | e2fc719399b507122ef4ea1867cff58e214be912 (diff) | |
| download | gcc-e93ca5cadeb71a04b2f8ef2ebcbadb2f0213d878.tar.gz | |
Remove TARGET_RELAXED_ORDERING and optimize for weak memory models.
This patch removes the special casing for targets with relaxed
memory ordering and handles guard accesses with equivalent
atomic load acquire operations. In this process we change the
algorithm to load the guard variable with an atomic load that
has ACQUIRE semantics.
This then means that on targets which have weak memory models, the
fast path is inlined and can directly use a load-acquire instruction
where available (and yay! one more hook gone).
2015-06-04 Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
PR c++/66192
PR target/66200
* doc/tm.texi: Regenerate.
* doc/tm.texi.in (TARGET_RELAXED_ORDERING): Delete.
* target.def (TARGET_RELAXED_ORDERING): Likewise.
* config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Likewise.
* config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Likewise.
* config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Likewise.
* config/sparc/linux.h (SPARC_RELAXED_ORDERING): Likewise.
* config/sparc/linux64.h (SPARC_RELAXED_ORDERING): Likewise.
* config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Likewise.
* config/sparc/sparc.h (SPARC_RELAXED_ORDERING): Likewise.
* system.h (TARGET_RELAXED_ORDERING): Poison.
2015-06-04 Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
PR c++/66192
PR target/66200
* cp-tree.h (get_guard_cond): Adjust declaration
* decl.c (expand_static_init): Use atomic load acquire
and adjust call to get_guard_cond.
* decl2.c (build_atomic_load_byte): New function.
(get_guard_cond): Handle thread_safety.
(one_static_initialization_or_destruction): Adjust call to
get_guard_cond.
From-SVN: r224118
Diffstat (limited to 'gcc/config/sparc/linux64.h')
| -rw-r--r-- | gcc/config/sparc/linux64.h | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/gcc/config/sparc/linux64.h b/gcc/config/sparc/linux64.h index 43da8480f24..efa33fbf77b 100644 --- a/gcc/config/sparc/linux64.h +++ b/gcc/config/sparc/linux64.h @@ -253,12 +253,6 @@ do { \ /* Static stack checking is supported by means of probes. */ #define STACK_CHECK_STATIC_BUILTIN 1 -/* Linux currently uses RMO in uniprocessor mode, which is equivalent to - TMO, and TMO in multiprocessor mode. But they reserve the right to - change their minds. */ -#undef SPARC_RELAXED_ORDERING -#define SPARC_RELAXED_ORDERING true - #undef NEED_INDICATE_EXEC_STACK #define NEED_INDICATE_EXEC_STACK 1 |