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Re: [RFC] Removal of loop notes
- From: Joe Buck <Joe dot Buck at synopsys dot COM>
- To: Steven Bosscher <stevenb dot gcc at gmail dot com>
- Cc: Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>, Richard Kenner <kenner at vlsi1 dot ultra dot nyu dot edu>, wilson at specifix dot com, gcc-patches at gcc dot gnu dot org, gcc at gcc dot gnu dot org
- Date: Thu, 9 Mar 2006 09:36:51 -0800
- Subject: Re: [RFC] Removal of loop notes
- References: <10603090257.AA02846@vlsi1.ultra.nyu.edu> <20060309081235.GA5667@atrey.karlin.mff.cuni.cz> <20060309170309.GB20418@synopsys.com> <571f6b510603090926v7dc26c6cpd8593c5cdb83774e@mail.gmail.com>
On 3/9/06, Joe Buck <Joe.Buck@synopsys.com> wrote:
> > Profile information isn't always available.
On Thu, Mar 09, 2006 at 06:26:27PM +0100, Steven Bosscher wrote:
> But branch predictions are, and those are still far more reliable than loop
> notes. The predictions use natural loop discovery and they are exact for
> loops with a known number of iterations.
Agreed.