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Re: [dataflow] partial register handling

From: Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>
To: Paolo Bonzini <bonzini at gnu dot org>, Kenneth Zadeck <zadeck at naturalbridge dot com>, Roman Zippel <zippel at linux-m68k dot org>, gcc at gcc dot gnu dot org, dberlin at dberlin dot org, Ian Lance Taylor <iant at google dot com>, richard at codesourcery dot com
Date: Sat, 12 May 2007 11:14:13 +0200
Subject: Re: [dataflow] partial register handling
References: <Pine.LNX.4.64.0705101940450.2958@scrub.home> <Pine.LNX.4.64.0705111307140.2958@scrub.home> <4644613C.2000304@naturalbridge.com> <46446E15.2050207@gnu.org> <87odkq7922.fsf@firetop.home>

Richard Sandiford wrote:

Paolo Bonzini <bonzini@gnu.org> writes:

My opinion:
(set (subreg:HI (reg:SI) 2) ...
DF_REF_READ_WRITE?
yep, only case without PARTIAL


Sorry if this is a daft question, but why would it be treated as a read?
I thought that without strict_lowpart, this sort of subreg assignment
was morally equivalent to a normal REG definition in which the upper
bits are "don't care".

Yes, I said elsewhere to ignore this message...

Paolo

References:
- [dataflow] partial register handling
  - From: Roman Zippel
- Re: [dataflow] partial register handling
  - From: Roman Zippel
- Re: [dataflow] partial register handling
  - From: Kenneth Zadeck
- Re: [dataflow] partial register handling
  - From: Paolo Bonzini
- Re: [dataflow] partial register handling
  - From: Richard Sandiford

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