Re: [PATCH] Fix PR78343

2016-11-28 Thread Richard Biener
On Mon, 28 Nov 2016, Christophe Lyon wrote: > Hi Richard, > > > On 25 November 2016 at 11:20, Richard Biener wrote: > > On Thu, 24 Nov 2016, Richard Biener wrote: > > > >> > >> I am testing the following patch for an optimization regression where > >> a loop made dead by final value replacement

Re: [PATCH] Fix PR78343

2016-11-28 Thread Christophe Lyon
Hi Richard, On 25 November 2016 at 11:20, Richard Biener wrote: > On Thu, 24 Nov 2016, Richard Biener wrote: > >> >> I am testing the following patch for an optimization regression where >> a loop made dead by final value replacement was made used again by >> DOM 20 passes later. The real issue

Re: [PATCH] Fix PR78343

2016-11-25 Thread Richard Biener
On Thu, 24 Nov 2016, Richard Biener wrote: > > I am testing the following patch for an optimization regression where > a loop made dead by final value replacement was made used again by > DOM 20 passes later. The real issue here is that we do not get rid > of dead loops until very late so this p