> 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. Honza > > Jakub
