On Wed, May 03, 2017 at 06:39:18PM +0200, Jan Hubicka wrote:
> > On Wed, May 03, 2017 at 06:18:08PM +0200, Jan Hubicka wrote:
> > > Hi,
> > > my change to sreals makes GCC to be miscompiled with GCC 4.1 and -O0.
> > > This is
> > > related to fact that using sreal implies a non-trivial constructor and
> > > thus
> > > ggc_cleared_alloc is no longer standard compliant. I however do not
> > > quite understand
> > > why GCC 4.1 manages to misoptimize this code but I have checked that this
> > > helps
> > > to fix the issue and hopefully will re-start our periodic testers.
> >
> > Is store-merging pass able to optimize that back into reasonable code
> > (sure, not into ggc_cleared_alloc)?
>
> It is still a sequence of assignments to 0 in .optimized pass.
Including the bool fields that are adjacent?
Jakub
