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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/system.h | |
| parent | e2fc719399b507122ef4ea1867cff58e214be912 (diff) | |
| download | gcc-e93ca5cadeb71a04b2f8ef2ebcbadb2f0213d878.zip gcc-e93ca5cadeb71a04b2f8ef2ebcbadb2f0213d878.tar.gz gcc-e93ca5cadeb71a04b2f8ef2ebcbadb2f0213d878.tar.bz2 | |
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/system.h')
| -rw-r--r-- | gcc/system.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/gcc/system.h b/gcc/system.h index 448a7fe..9ca5b5f 100644 --- a/gcc/system.h +++ b/gcc/system.h @@ -964,7 +964,7 @@ extern void fancy_abort (const char *, int, const char *) ATTRIBUTE_NORETURN; TARGET_HANDLE_PRAGMA_EXTERN_PREFIX \ TARGET_VECTORIZE_BUILTIN_MUL_WIDEN_EVEN \ TARGET_VECTORIZE_BUILTIN_MUL_WIDEN_ODD \ - TARGET_MD_ASM_CLOBBERS + TARGET_MD_ASM_CLOBBERS TARGET_RELAXED_ORDERING /* Arrays that were deleted in favor of a functional interface. */ #pragma GCC poison built_in_decls implicit_built_in_decls |