http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49936
--- Comment #2 from Vladimir Makarov <vmakarov at redhat dot com> 2011-08-16 02:05:02 UTC --- After thorough investigation of the problem I came to a conclusion that fixing it in IRA requires to form regions on pseudo mode usage too (besides just register pressure). Allocnos for the pseudo in question should get a different classes (FP class inside loop and INT outside). The problem is that IRA were written on assumption that register class of all allocnos for a pseudo is the same. It needs a lot of changes besides a new code for forming regions on the mode base. I'll try to do this but it will take long time. If it does not work, I could try to restore 4.6 behaviour (assigning INT class instead of memory).
