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From: "mikpe at it dot uu.se" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/50065] -Os, -O2, -O3 optimization breaks LD/ST ordering on 32-bit SPARC
Date: Sun, 14 Aug 2011 09:38:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50065

--- Comment #5 from Mikael Pettersson <mikpe at it dot uu.se> 2011-08-14 09:24:31 UTC ---
You need a _compiler_ barrier before the store in _unlock().