On 02/23/2017 04:24 AM, Bin Cheng 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?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.
I went ahead and installed this. jeff
