On Sat, Jan 2, 2016 at 11:01 AM, Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx> wrote: > On Sat, Jan 02, 2016 at 10:01:26AM -0500, Jeffrey Walton wrote: >> 0x000000010048d87b <+174>: xor %eax,%eax >> => 0x000000010048d87d <+176>: mov (%r11,%rax,1),%dl >> >> (gdb) info registers >> rax 0x9b7a 0x9b7a > > Why is AX not 0 here? That seems wrong. > Not sure... Maybe that explains the crash. I did find similar code in a slide deck at http://sbac.lip6.fr/2014/session%208/1-BLAP.pdf when searching for what that particular move performs. Jeff