Re: [PATCH 4/8] cfg: adjust phi-sources when merging BBs

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To: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH 4/8] cfg: adjust phi-sources when merging BBs
From: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
Date: Tue, 17 Nov 2020 01:42:24 +0100
Cc: Sparse Mailing-list <linux-sparse@xxxxxxxxxxxxxxx>
In-reply-to: <CAHk-=whOLb3-HR=imWNtKk4n2FwZTuZSgYDB2sH=307mqQN+SQ@mail.gmail.com>
References: <20201116222927.51939-1-luc.vanoostenryck@gmail.com> <20201116222927.51939-5-luc.vanoostenryck@gmail.com> <CAHk-=wiSQ-=SRspfVWdE17ORGJtjJzPCvCOo7ETwM9jeUG6uvg@mail.gmail.com> <20201116234712.7nk5ktce4ntcumbs@ltop.local> <CAHk-=whOLb3-HR=imWNtKk4n2FwZTuZSgYDB2sH=307mqQN+SQ@mail.gmail.com>

On Mon, Nov 16, 2020 at 04:16:01PM -0800, Linus Torvalds wrote:
> 
> Could the phi_users list be just replaced by the target (OP_PHI)
> pseudo (or instruction)?

Yes, trivially if set liveness is calculated. But this
information could be useful earlier, then it would need some
work to track it (not sure it would be worth, though).

-- Luc

References:
- [PATCH 0/8] cfg: early CFG simplification
  - From: Luc Van Oostenryck
- [PATCH 4/8] cfg: adjust phi-sources when merging BBs
  - From: Luc Van Oostenryck
- Re: [PATCH 4/8] cfg: adjust phi-sources when merging BBs
  - From: Linus Torvalds
- Re: [PATCH 4/8] cfg: adjust phi-sources when merging BBs
  - From: Luc Van Oostenryck
- Re: [PATCH 4/8] cfg: adjust phi-sources when merging BBs
  - From: Linus Torvalds

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