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Re: egcs 2.91.14: packed-1 failure on openvms/alpha, more info
- To: Richard Henderson <rth at cygnus dot com>
- Subject: Re: egcs 2.91.14: packed-1 failure on openvms/alpha, more info
- From: Jeffrey A Law <law at cygnus dot com>
- Date: Mon, 30 Mar 1998 16:01:12 -0700
- cc: Jim Wilson <wilson at cygnus dot com>, kkaempf at progis dot de, egcs at cygnus dot com
- Reply-To: law at cygnus dot com
In message <19980330145218.21981@dot.cygnus.com>you write:
> On Thu, Mar 26, 1998 at 04:33:54PM -0700, Jeffrey A Law wrote:
> > Who knows, that code might even be totally useless now that we
> > propagate alias information better.
>
> Is that the same code that records "known alignment" of pointers
> in registers? That information is still useful, though the way
> we keep track of it seems truely ugly.
I don't think it records known alignment at that particular time;
just the fact that if A is a pointer, then A + C is a pointer
(not strictly true, but for most machines that's good enough).
It may be the case that we propagate alignment stuff after we
set REGNO_POINTER_FLAG on these "derived" pointers, but I haven't
looked.
That is something we might want to do as part of the alias analysis
code though....
jeff