https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68302
--- Comment #15 from Steve Ellcey <sje at gcc dot gnu.org> --- Created attachment 36978 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36978&action=edit patch to put debug statements in cselib.c I still cannot reproduce the failure. I have built cross compilers on linux with GCC 4.9 and GCC 5.2 and I have built the cross compiler in both 32 and 64 bit modes. Here is a patch file to apply to cselib.c, Could you try applying it, building GCC, running the test program, and sending me the output. Maybe comparing the output you get with what I get will help me understand what is going on. This patch includes the earlier changes I had suggested so you should remove those before applying this patch or they will conflict.