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Re: ARM - register liveness problem

From: Richard Henderson <rth at redhat dot com>
To: Vidacs Laszlo <lac at rgai dot hu>
Cc: gcc-patches at gcc dot gnu dot org
Date: Thu, 27 Feb 2003 17:54:39 -0800
Subject: Re: ARM - register liveness problem
References: <Pine.LNX.4.50.0302271525360.20433-100000@rgai.inf.u-szeged.hu>

On Thu, Feb 27, 2003 at 03:28:51PM +0100, Vidacs Laszlo wrote:
> I am writing a patch for ARM target. I would like to use register liveness
> information during the peephole2 phase. The peep2_regno_dead_p() function
> says that register r4 is live at instruction marked with (*) in the
> example below, but i think it is dead because of the ldmfd instruction.
> Why is it still considered live?

You'll have to post the rtl involved, as well as your patch
for us to be able to tell.

> One more question: is it possible to read liveness information of flags
> (C, Z, etc.) ?

No.


r~

References:
- ARM - register liveness problem
  - From: Vidacs Laszlo

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