https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82666
--- Comment #5 from Jeffrey A. Law <law at redhat dot com> --- Aldy, It's less about whether or not there is a cmov (I get one with and without PRE), but more about what part of the loop we're using the cmov for. Consider what we get in the .optimized dump at -O3 correct. But the target *assembly* we want is what you'd get with -O3 -fno-tree-pre. ie, PRE is making it harder for us to generate the cmov we want.
