On Thu, Feb 23, 2017 at 12:24 PM, Bin Cheng <bin.ch...@arm.com> wrote: > Hi, > This patch resolves spec2k/mgrid regression as reported by PR79663. Root > cause has been > described thoroughly in comment #1/#2 of > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79663 > This patch handles ZERO/non-ZERO length chains differently and only reversely > combines refs > for ZERO length chains. It also does small improvement with in place list > swap. > Bootstrap and test on x86_64 and AArch64, is it OK?
Ok. Thanks, Richard. > Thanks, > bin > > 2017-01-21 Bin Cheng <bin.ch...@arm.com> > > PR tree-optimization/79663 > * tree-predcom.c (combine_chains): Process refs in reverse order > only for ZERO length chains, and add explaining comment.