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Re: PATCH: [gcc3.5 improvement branch] Very Simple constantpropagation
- From: Roger Sayle <roger at eyesopen dot com>
- To: Geoff Keating <geoffk at geoffk dot org>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Thu, 15 Jan 2004 17:51:30 -0700 (MST)
- Subject: Re: PATCH: [gcc3.5 improvement branch] Very Simple constantpropagation
On 15 Jan 2004, Geoff Keating wrote:
> I'm pretty sure this isn't safe.
Oops. I forgot to mention this has been bootstrapped and regression
tested on i686-pc-linux-gnu, all languages except ada and treelang,
with no new failures.
I agree that there might be issues, which is why I was waiting for
stage1. But we know combine already handles dependencies like the one
you point out, my concern was/is more that we might encounter invalid
or incorrect REG_EQUAL notes attached to instructions.
Roger
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