[Bug middle-end/39954] [4.5 Regression] Revision 146817 caused unaligned access in gcc.dg/torture/pr26565.c

[matz at gcc dot gnu dot org]

------- Comment #14 from matz at gcc dot gnu dot org  2009-05-06 09:48 -------
Mark, I'm certainly willing to help fixing this, but it's not a new
regression.  Before my change TER _sometimes_ worked around the pre-existing
problem, but it's trivial to construct a case exposing it also before
expand from SSA:

void * send_probe(struct outdata *outdata, struct timeval *tp)
{
    memcpy(&outdata->tv, tp, sizeof outdata->tv);
    return &outdata->tv;
}

(or having more than one reference to &outdata->tv in some other way).

gcc 4.3, 4.4 and trunk before expand from SSA will emit unaligned accesses
here.  I haven't checked older ones, but the problem exists since introduction
of SSA (and TER in its current form).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39954