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author	Richard Henderson <rth@redhat.com>
	Fri, 21 Feb 2014 00:14:05 +0000 (16:14 -0800)
committer	Richard Henderson <rth@gcc.gnu.org>
	Fri, 21 Feb 2014 00:14:05 +0000 (16:14 -0800)
commit	15aef6ee60ac4237d884da0a72a3eb2721990cf8
tree	23874fcb6dccd589517d48d61675046a72bed367	tree
parent	4d1bdb4c8f3585ffaeecb7a1782499652b9ae19a	commit \| diff

re PR c++/60272 (atomic<>::compare_exchange_weak has spurious store and can cause race conditions)

PR c++/60272

gcc/
* builtins.c (expand_builtin_atomic_compare_exchange): Conditionalize
on failure the store back into EXPECT.
libatomic/
* cas_n.c (libat_compare_exchange): Conditionalize on failure
the store back to EPTR.

From-SVN: r207973

gcc/ChangeLog		diff \| blob \| blame \| history
gcc/builtins.c		diff \| blob \| blame \| history
libatomic/ChangeLog		diff \| blob \| blame \| history
libatomic/cas_n.c		diff \| blob \| blame \| history

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