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Re: [tree-ssa] cfghooks questions

From: Devang Patel <dpatel at apple dot com>
To: Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>
Cc: "gcc at gcc dot gnu dot org list" <gcc at gcc dot gnu dot org>
Date: Tue, 13 Jan 2004 10:42:12 -0800
Subject: Re: [tree-ssa] cfghooks questions
References: <8949E841-456F-11D8-BEAA-000393A91CAA@apple.com> <20040113151812.GA27764@atrey.karlin.mff.cuni.cz>

On Jan 13, 2004, at 7:18 AM, Zdenek Dvorak wrote:

cfg_layout is just a layer over rtl that abstracts over some issues
on the raw rtl representation (explicit jumps, notes and insns not
belonging to any basic block).


I guess, I am still confused about why there are two set of hooks
rtl_cfg_hooks and cfg_layout_rtl_cfg_hooks? As I understand,
cfg_layout_rtl_cfg_hooks also maintains/updates cfg_layout. But
I do not understand then why not use that set all the time for
rtl IR (ie why we need rtl_cfg_hooks?). As you can see I am not
very clear. It'd be useful if you can point me to a place in
sources which can help me to clarify my confusion.

Thanks,
--
Devang

Follow-Ups:
- Re: [tree-ssa] cfghooks questions
  - From: Jan Hubicka

References:
- [tree-ssa] cfghooks questions
  - From: Devang Patel
- Re: [tree-ssa] cfghooks questions
  - From: Zdenek Dvorak

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