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Re: [PATCH] Optimize subregs of zero and sign extensions (take 2)

From: Richard Henderson <rth at redhat dot com>
To: Roger Sayle <roger at eyesopen dot com>
Cc: gcc-patches at gcc dot gnu dot org, Paolo Bonzini <bonzini at gnu dot org>
Date: Wed, 21 Jan 2004 16:15:53 -0800
Subject: Re: [PATCH] Optimize subregs of zero and sign extensions (take 2)
References: <20040121190839.GC15153@redhat.com> <Pine.LNX.4.44.0401211528570.3625-100000@www.eyesopen.com>

On Wed, Jan 21, 2004 at 03:33:23PM -0700, Roger Sayle wrote:
> 	* rtlanal.c (subreg_lsb_1): New function split out from subreg_lsb.
> 	(subreg_lsb): Change to call new subreg_lsb_1 helper function.
> 	* rtl.h (subreg_lsb_1): Prototype here.
> 	* simplify-rtx.c (simplify_subreg): Optimize subregs of zero and
> 	sign extensions.

Ok, except,

> + 	return const0_rtx;

How about CONST0_RTX (outermode)?


r~

Follow-Ups:
- Re: [PATCH] Optimize subregs of zero and sign extensions (take 2)
  - From: Roger Sayle

References:
- Re: [PATCH] Optimize subregs of zero and sign extensions
  - From: Richard Henderson
- [PATCH] Optimize subregs of zero and sign extensions (take 2)
  - From: Roger Sayle

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