http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54742
--- Comment #3 from Joey Ye <joey.ye at arm dot com> 2012-10-10 07:37:15 UTC --- Current jump-threading is too conservative to thread this case. Following limits are what I observed by reading code: 1. It only thread around blocks that * Single entry * Multiple exit * No PHI nodes Even the simple case as forwarding block is excluded. 2. It only thread a block once. For blocks with more than one entries, it is possible to be threaded more than one time too.
