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Re: Some questions about pass web
- From: Jan Hubicka <hubicka at ucw dot cz>
- To: Jeff Law <law at redhat dot com>
- Cc: Steven Bosscher <stevenb dot gcc at gmail dot com>, "Bin.Cheng" <amker dot cheng at gmail dot com>, Carrot Wei <carrot at google dot com>, Jan Hubicka <hubicka at ucw dot cz>, GCC Development <gcc at gcc dot gnu dot org>
- Date: Wed, 10 Sep 2014 02:31:45 +0200
- Subject: Re: Some questions about pass web
- Authentication-results: sourceware.org; auth=none
- References: <CAEe8uECWjpB7LqX_k91Vs2W6jmX4BqwwBmyEcxnmRu8=hmy_vA at mail dot gmail dot com> <CAHFci29vaC6F5uvW8Ezx+OtEkhXb5dU-w7yOQDhNocG_vayb0w at mail dot gmail dot com> <CABu31nO08-Kf=VkOyppiDpoOo2JcxyQxLsgWQr_ERh=HGJqoCw at mail dot gmail dot com> <5407322C dot 6050300 at redhat dot com>
> On 09/03/14 02:35, Steven Bosscher wrote:
> >On Wed, Sep 3, 2014 at 9:17 AM, Bin.Cheng wrote:
> >>Last time I tried, there are several passes after loop_done and before
> >>auto-inc-dec can't handle auto-increment addressing mode, including
> >>fweb.
> >
> >It surprises me that pass_web can't handle AUTOINC. Perhaps I'm off my
> >rocker, but it's always been my understanding that almost all passes
> >handle AUTOINC just fine (or at least conservatively: punt if you see
> >an AUTOINC), and that only CSE really doesn't know about AUTOINC at
> >all.
> In the past autoinc instructions didn't appear until flow (just
> prior to combine) and that was documented behaviour. So anything
> which was run strictly prior to flow/combine wasn't autoinc aware.
> That may have changed somewhat with the autoinc rewrite.
It is long time since I looked at web, but it should understand read/write refs
and that those must remain unified. how does DF refs look like for autoinc?
Honza
>
> jeff