On Mon, Jun 21, 2010 at 17:21, Jeff Law <l...@redhat.com> wrote: > Ouch. You've got another problem in that combine doesn't combine across > basic blocks.
Actually tree-if-conversion does take care of transforming the inner loop into one BB to enable vectorization. So we don't have the cross-BB combine problem. > Can you attack it in forwprop? > I'll give it a look. > I'm a little surprised DOM removed the multiplication -- it's not actually a > runtime redundancy, it's more like a code hoisting since on any given > iteration of the loop the expression level * qmul is only evaluated once. Right, I am pretty sure DOM does this transform. Sebastian
