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Re: [PATCH] Update BBs in cleanup_barriers pass (PR rtl-optimization/61058)

From: Jeff Law <law at redhat dot com>
To: Jakub Jelinek <jakub at redhat dot com>, Richard Biener <richard dot guenther at gmail dot com>
Cc: Steven Bosscher <stevenb dot gcc at gmail dot com>, Eric Botcazou <ebotcazou at adacore dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Mon, 26 Jan 2015 11:45:54 -0700
Subject: Re: [PATCH] Update BBs in cleanup_barriers pass (PR rtl-optimization/61058)
Authentication-results: sourceware.org; auth=none
References: <20150122204317 dot GM1746 at tucnak dot redhat dot com> <2504092 dot nZhz1bK3s6 at polaris> <20150126091100 dot GG1746 at tucnak dot redhat dot com> <CABu31nOspokDkMbSk2ydZj8O8jL_3-ipNZ_O2cCQ=YsSa-FB6w at mail dot gmail dot com> <20150126114702 dot GK1746 at tucnak dot redhat dot com> <CAFiYyc3o5Du+aHAz6xC05Akwuip-r1MdCPjTUt7ZPjb4Ga8a+Q at mail dot gmail dot com> <20150126133404 dot GN1746 at tucnak dot redhat dot com>

On 01/26/15 06:34, Jakub Jelinek wrote:

On Mon, Jan 26, 2015 at 01:11:01PM +0100, Richard Biener wrote:

I agree that freeing the cfg and immediately computing it again doesn't make
sense, but I just don't see this patch being incompatible with that.


I wonder if handing over pass pipeline control to targets at
machine_reorg time (including free_cfg) makes sense...
(either giving control back for stuff like final() or make it call
into the middle-end again).


Perhaps, but not sure if such changes are desirable for stage4.
And certainly unsuitable for release branches.

That would seem to take a big mistake (machine_reorg) and make it evenworse.


Jeff

References:
- [PATCH] Update BBs in cleanup_barriers pass (PR rtl-optimization/61058)
  - From: Jakub Jelinek
- Re: [PATCH] Update BBs in cleanup_barriers pass (PR rtl-optimization/61058)
  - From: Eric Botcazou
- Re: [PATCH] Update BBs in cleanup_barriers pass (PR rtl-optimization/61058)
  - From: Jakub Jelinek
- Re: [PATCH] Update BBs in cleanup_barriers pass (PR rtl-optimization/61058)
  - From: Steven Bosscher
- Re: [PATCH] Update BBs in cleanup_barriers pass (PR rtl-optimization/61058)
  - From: Jakub Jelinek
- Re: [PATCH] Update BBs in cleanup_barriers pass (PR rtl-optimization/61058)
  - From: Richard Biener
- Re: [PATCH] Update BBs in cleanup_barriers pass (PR rtl-optimization/61058)
  - From: Jakub Jelinek

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