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| author | Torvald Riegel <torvald@gcc.gnu.org> | 2017-02-01 17:21:59 +0000 |
|---|---|---|
| committer | Torvald Riegel <torvald@gcc.gnu.org> | 2017-02-01 17:21:59 +0000 |
| commit | 969a32ce9354585f5f2b89df2e025f52eb0e1644 (patch) | |
| tree | ba5dc4787f7d4f9d23224810508207f4fcc188dc /libatomic/acinclude.m4 | |
| parent | 55e75c7c6bcfe386d0ecbf4611cff81040af00b3 (diff) | |
| download | gcc-969a32ce9354585f5f2b89df2e025f52eb0e1644.zip gcc-969a32ce9354585f5f2b89df2e025f52eb0e1644.tar.gz gcc-969a32ce9354585f5f2b89df2e025f52eb0e1644.tar.bz2 | |
Fix __atomic to not implement atomic loads with CAS.
gcc/
* builtins.c (fold_builtin_atomic_always_lock_free): Make "lock-free"
conditional on existance of a fast atomic load.
* optabs-query.c (can_atomic_load_p): New function.
* optabs-query.h (can_atomic_load_p): Declare it.
* optabs.c (expand_atomic_exchange): Always delegate to libatomic if
no fast atomic load is available for the particular size of access.
(expand_atomic_compare_and_swap): Likewise.
(expand_atomic_load): Likewise.
(expand_atomic_store): Likewise.
(expand_atomic_fetch_op): Likewise.
* testsuite/lib/target-supports.exp
(check_effective_target_sync_int_128): Remove x86 because it provides
no fast atomic load.
(check_effective_target_sync_int_128_runtime): Likewise.
libatomic/
* acinclude.m4: Add #define FAST_ATOMIC_LDST_*.
* auto-config.h.in: Regenerate.
* config/x86/host-config.h (FAST_ATOMIC_LDST_16): Define to 0.
(atomic_compare_exchange_n): New.
* glfree.c (EXACT, LARGER): Change condition and add comments.
From-SVN: r245098
Diffstat (limited to 'libatomic/acinclude.m4')
| -rw-r--r-- | libatomic/acinclude.m4 | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/libatomic/acinclude.m4 b/libatomic/acinclude.m4 index a86e52b..485d731 100644 --- a/libatomic/acinclude.m4 +++ b/libatomic/acinclude.m4 @@ -96,6 +96,7 @@ AC_DEFUN([LIBAT_HAVE_ATOMIC_LOADSTORE],[ LIBAT_DEFINE_YESNO([HAVE_ATOMIC_LDST_$2], [$libat_cv_have_at_ldst_$2], [Have __atomic_load/store for $2 byte integers.]) AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_LDST_$2 HAVE_ATOMIC_LDST_$2]) + AH_BOTTOM([#define FAST_ATOMIC_LDST_$2 HAVE_ATOMIC_LDST_$2]) ]) dnl |