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Re: powerpc patch 1 of 9

From: Alan Modra <amodra at bigpond dot net dot au>
To: Geoff Keating <geoffk at geoffk dot org>
Cc: gcc-patches at gcc dot gnu dot org
Date: Sat, 23 Feb 2002 20:29:10 +1030
Subject: Re: powerpc patch 1 of 9
References: <20020220110029.GH1054@bubble.sa.bigpond.net.au> <jmadu1c66i.fsf@desire.geoffk.org>

On Fri, Feb 22, 2002 at 05:56:05PM -0800, Geoff Keating wrote:
> Alan Modra <amodra@bigpond.net.au> writes:
> 
> > 	* config/rs6000/rs6000.c (u_short_cint_operand): Mask off
> > 	irrelevant bits before testing with 'K' constraint.
> > 	(includes_lshift_p): Mask irrelevant bits of SImode const_int.
> > 	(includes_rshift_p): Likewise.
> 
> These seem to be optimising for cases that shouldn't be happening.
> Can you find out where these constants are being generated and fix it
> there instead?

Happens when SImode constants are sign extended in various places.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre

Follow-Ups:
- Re: powerpc patch 1 of 9
  - From: Geoff Keating

References:
- powerpc patch 1 of 9
  - From: Alan Modra
- Re: powerpc patch 1 of 9
  - From: Geoff Keating

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