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Re: RFC: integer division by multiply with invariant reciprocal

From: Jeffrey Law <law at redhat dot com>
To: Andrew Pinski <pinskia at gmail dot com>
Cc: "Charles J. Tabony" <TabonyEE at austin dot rr dot com>, gcc at gcc dot gnu dot org, Joern Rennecke <amylaar at spamcop dot net>
Date: Sun, 25 Mar 2007 23:28:15 -0600
Subject: Re: RFC: integer division by multiply with invariant reciprocal
References: <20070325101309.34884cwg4owook4w@webmail.spamcop.net> <20070326022236.GA2792@entropy> <de8d50360703252224k2a9939eatafb56dc6723000f@mail.gmail.com>
Reply-to: law at redhat dot com

On Sun, 2007-03-25 at 22:24 -0700, Andrew Pinski wrote:
> On 3/25/07, Charles J. Tabony <TabonyEE@austin.rr.com> wrote:
> > > So I think that the easiest way to integrate this with the rest of the
> > > compiler is to have a target hook that emits trees to compute SHIFT, INV1
> > > and INV2.
> 
> I don't think target hooks to expand trees early is a good idea.  RTL
> is not going away, and in fact GCC's model having two IR is not unique
> to GCC, XLC uses that model also.
AMEN!
Jeff

References:
- RFC: integer division by multiply with invariant reciprocal
  - From: Joern Rennecke
- Re: RFC: integer division by multiply with invariant reciprocal
  - From: Charles J. Tabony
- Re: RFC: integer division by multiply with invariant reciprocal
  - From: Andrew Pinski

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