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Fix atomic_fetch_xor_release.

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No code uses atomic_fetch_xor_release except for the upcoming
conditional variable rewrite. Therefore there is no user
visible bug here. The use of atomic_compare_and_exchange_bool_rel
is removed (since it doesn't exist anymore), and is replaced
by atomic_compare_exchange_weak_release.

We use weak_release because it provides better performance in
the loop (the weak semantic) and because the xor is release MO
(the release semantic). We don't reload expected in the loop
because atomic_compare_and_exchange_weak_release does this for
us as part of the CAS failure.

It is otherwise a fairly plain conversion that fixes building
the new condvar for 32-bit x86. Passes all regression tests
for x86.
This commit is contained in:
Carlos O'Donell 2016-10-26 00:00:13 -04:00
parent cd74aa4d5c
commit abff18c0c6
2 changed files with 17 additions and 8 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2016-10-26 Carlos O'Donell <carlos@redhat.com>
* include/atomic.h
[USE_COMPILER_ATOMIC_BUILTINS && !atomic_fetch_xor_release]
(atomic_fetch_xor_release): Use atomic_compare_exchange_weak_release.
2016-10-25 Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com>
* stdlib/Makefile (tests): Add tst-strfrom and tst-strfrom-locale.

19
include/atomic.h
View File

@ -777,18 +777,21 @@ void __atomic_link_error (void);
# endif
# ifndef atomic_fetch_xor_release
/* Failing the atomic_compare_exchange_weak_release reloads the value in
__atg104_expected, so we need only do the XOR again and retry. */
# define atomic_fetch_xor_release(mem, operand) \
({ __typeof (*(mem)) __atg104_old; \
__typeof (mem) __atg104_memp = (mem); \
({ __typeof (mem) __atg104_memp = (mem); \
__typeof (*(mem)) __atg104_expected = (*__atg104_memp); \
__typeof (*(mem)) __atg104_desired; \
__typeof (*(mem)) __atg104_op = (operand); \
\
do \
__atg104_old = (*__atg104_memp); \
while (__builtin_expect \
(atomic_compare_and_exchange_bool_rel ( \
__atg104_memp, __atg104_old ^ __atg104_op, __atg104_old), 0));\
\
__atg104_old; })
__atg104_desired = __atg104_expected ^ __atg104_op; \
while (__glibc_unlikely \
(atomic_compare_exchange_weak_release ( \
__atg104_memp, &__atg104_expected, __atg104_desired) \
== 0)); \
__atg104_expected; })
#endif
#endif /* !USE_ATOMIC_COMPILER_BUILTINS */