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Re: PR 13722 candidate fix

I tried a bootstrap with all HAVE_POST_* macros turned off, and it still
failed.

I tried adding debug_rtx{_list,} calls to ia64_split_tmode_move and I
noticed a few things.

You are adding REG_INC notes when a MEM operand is a dest, but not when
a src.  An auto-inc address is still a side-effect even when it is used
in a source operand.  This is easy to fix by copying some code, I'll
have to try another bootstrap with this change.

I noticed that we are looking REG_*_P flag bits and alias info for
registers, because you are generating new ones with with gen_rtx_REG
without copying any info over from the old ones.  It isn't clear if this
is an optimization problem, I suspect not.  I think this is only a
potential performance loss.
-- 
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com
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