------- Additional Comments From steven at gcc dot gnu dot org 2005-03-27 10:19 ------- Two things: 1) Test case? No test case, no way to reproduce it without re-doing the investigating you have already done. Stop work duplication, provide test cases to your fellow GCC hackers. I don't think anyone will confirm this bug until there is a self-contained test case (that you can add to this PR as an attachment), preferably with an annotated RTL dump to show the problem (also as an attachment). See also the bug reporting guide, "http://gcc.gnu.org/bugs.html#report". 2) Try compiling with -fweb, it may result in the code you are looking for. It basically is live range splitting, and it is a known problem that we don't do that after unrolling. Really, his is a job for the register allocator, but since the existing one in GCC can not do this, we need a live range splitting pass after unrolling. (And no, we do not need this pass in the general case because when going out of SSA form from trees we already do live range splitting too, and web is a surprisingly expensive pass).
-- What |Removed |Added ---------------------------------------------------------------------------- CC| |stevenb at suse dot de http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20376