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Re: Your change of September 11, 1998
- To: Richard Kenner <kenner at vlsi1 dot ultra dot nyu dot edu>
- Subject: Re: Your change of September 11, 1998
- From: Richard Henderson <rth at redhat dot com>
- Date: Tue, 16 Jan 2001 05:13:20 -0800
- Cc: gcc at gcc dot gnu dot org
- References: <10101161227.AA26799@vlsi1.ultra.nyu.edu>
On Tue, Jan 16, 2001 at 07:26:19AM -0500, Richard Kenner wrote:
> Useful, yes. Essential? Maybe yes, maybe no, depending on reorg.
>
> And flow.
No, I understand how flow works and it doesn't care.
We scan backwards from the end of a block. If we see a register used,
and it had been dead, it becomes live. If a register is either set or
clobbered -- we do not care which -- it becomes dead.
r~