------- Comment #4 from Hans dot Boehm at hp dot com  2007-08-29 00:53 -------
I'll make the %X1 change upstream.  Are there similar issues with some of the
other routines?

(See
http://bdwgc.cvs.sourceforge.net/bdwgc/bdwgc/libatomic_ops-1.2/src/atomic_ops/sysdeps/gcc/powerpc.h?revision=1.3&view=markup
)

Based on Book 2, section 1.4 of the architecture manual, I believe aligned word
access are always atomic on PowerPC.

The general wisdom among the experts I've talked to seems to be that a
conditional branch followed by isync is cheaper than an lwsync, and sufficient
for an acquire load.


-- 

Hans dot Boehm at hp dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |Hans dot Boehm at hp dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33171

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