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Re: Dec 30 patch causes large performance regression on ia64

To: Bernd Schmidt <bernds at redhat dot com>
Subject: Re: Dec 30 patch causes large performance regression on ia64
From: Richard Henderson <rth at redhat dot com>
Date: Tue, 20 Mar 2001 10:21:14 -0800
Cc: gcc-bugs at gcc dot gnu dot org
References: <20010317135439.A28514@redhat.com> <Pine.LNX.4.30.0103201524590.1311-100000@host140.cambridge.redhat.com>

On Tue, Mar 20, 2001 at 03:33:49PM +0000, Bernd Schmidt wrote:
> 3) flow complains about registers that are less wide than a word (e.g.
>    BImode).  I'm inclined to kill verify_wide_reg - what's the idea behind
>    it?

verify_wide_reg compensates for flow not properly tracking
lifetimes of multi-word registers.  In an ideal world it
would be an unconditional abort.  I really should expand the
commentary there...

If you've run into a problem with smaller registers, you have
encountered a bug elsewhere.

r~

References:
- Re: Dec 30 patch causes large performance regression on ia64
  - From: Richard Henderson
- Re: Dec 30 patch causes large performance regression on ia64
  - From: Bernd Schmidt

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