I've been looking into this, and it seems like this should probably be
the default.  Build Mesa (I'm using 6.5.2) with -Wstrict-aliasing and
you'll see what I'm talking about.  I was reading some bug reports
where this fixed issues with compiz/beryl, like "white screen"
lockups, etc.

Just a "heads up".

--Blair
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"The frivolity and boredom which unsettle the established order, the
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approaching change.  The gradual crumbling that left unaltered the
face of the whole is cut short by a sunburst which, in one flash,
illuminates the features of the new world."  --G.W.F. Hegel,
_Phenomenology of Spirit_ 5:11