From: George H <grgh007@yahoo.com>
To: Richard Henderson <rth@redhat.com>
Cc: gcc@gcc.gnu.org
Subject: Re: memrefs_conflict_p () for REGs in alias.c
Date: Thu, 03 Oct 2002 05:57:00 -0000 [thread overview]
Message-ID: <20021003094144.41828.qmail@web13104.mail.yahoo.com> (raw)
In-Reply-To: <20021001204330.GN12410@redhat.com>
> > I found that it always returns 1 for cse in case
> > of REG...
>
> Yes. alias.c computes function invariants. If a
> register
> is set more than once, it varies, and thus there is
> no data
> on what it points to.
>
>
> r~
The only point I wanted to indicate is that there
seems to be no way of determining whether the
addresses contained in two REGs may be distinct.
e.g. base_alias_check () *only compares the base
addresses* of two REGs and assumes aliasing if they
match.
The mechanism to know how the addresses in two REGs
have been computed is missing, which may help in
distinguishing the addresses.
-gh
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prev parent reply other threads:[~2002-10-03 9:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-30 22:03 George H
2002-09-30 22:13 ` David S. Miller
2002-09-30 22:19 ` George H
2002-10-01 14:02 ` Richard Henderson
2002-10-03 5:57 ` George H [this message]
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