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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/52080] Stores to bitfields introduce a store-data-race on adjacent data
Date: Wed, 01 Feb 2012 10:25:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52080

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-02-01 10:25:21 UTC ---
SPARC64 also can do 32bit loads/stores as the following testcase shows:

struct x {
    long a;
    unsigned int lock;
    unsigned int full;
};

void
wrong(struct x *ptr)
{
  ptr->full = 1;
}

here we simply use a 32bit store.