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Re: Possible gas regression

From: Alan Modra <amodra at gmail dot com>
To: NightStrike <nightstrike at gmail dot com>
Cc: "H.J. Lu" <hjl dot tools at gmail dot com>, binutils <binutils at sourceware dot org>
Date: Mon, 6 Sep 2010 12:25:01 +0930
Subject: Re: Possible gas regression
References: <AANLkTi=v7yBc=AvrNCOE8xDz0P1C5h-V31QeO6ZwpSsJ@mail.gmail.com> <AANLkTinOiOTO0oJV1=zZX9KJgoa_oVfXwY3O7607t4qR@mail.gmail.com> <AANLkTimwj8hp18Dvam56Y1T_Cu=AsNG8fJK-fv+exoJP@mail.gmail.com> <20100906001844.GG16874@bubble.grove.modra.org> <AANLkTikXhy7PZXrgRHu7t9VoCjMhjcH_GiDsVmiWn6=g@mail.gmail.com>

On Sun, Sep 05, 2010 at 09:19:05PM -0400, NightStrike wrote:
> On Sun, Sep 5, 2010 at 8:18 PM, Alan Modra <amodra@gmail.com> wrote:
> > On Sun, Sep 05, 2010 at 02:21:57PM -0400, NightStrike wrote:
> >> Using H.J's suggested fix of "andq $-1, %r8". ?Thanks, HJ!
> >
> > What is the point of and'ing with a mask of all ones?
> 
> I believe the intent was to zero out a certain section of a register.

Clearly so.  I was pointing out what seems to be a bug.
"mov %r8d,%r8d" perhaps?

-- 
Alan Modra
Australia Development Lab, IBM

Follow-Ups:
- Re: Possible gas regression
  - From: Kai Tietz

References:
- Possible gas regression
  - From: NightStrike
- Re: Possible gas regression
  - From: H.J. Lu
- Re: Possible gas regression
  - From: NightStrike
- Re: Possible gas regression
  - From: Alan Modra
- Re: Possible gas regression
  - From: NightStrike

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