https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68775
--- Comment #4 from William Seurer <seurer at linux dot vnet.ibm.com> --- (In reply to Richard Biener from comment #1) > Can you try to bisect to an affected source file (just use > -fno-tree-vectorize on all but one) and there to whether it is basic-block > or loop vectorization > (-fno-tree-loop-vectorize / -fno-tree-slp-vectorize) and specific > loop/basic-block with -fdbg-cnt=vect_slp:N or -fdbg-cnt=vect_loop:N? > > Note that it seems that tonto also fails (since forever) with AVX2 on x86_64. It still fails with just -fno-tree-vectorize but succeeds with both -fno-tree-loop-vectorize and -fno-tree-slp-vectorize. I am about to go through it flipping those for individual modules.
