llvm-svn: 13057

structure to being dynamically computed on demand.  This makes updating
loop information MUCH easier.

llvm-svn: 13045

llvm-svn: 13040

that the exit block of the loop becomes the new entry block of the function.

This was causing a verifier assertion on 252.eon.

llvm-svn: 13039

using instructions inside of the loop.  This should fix the MishaTest failure
from last night.

llvm-svn: 13038

block.  The primary motivation for doing this is that we can now unroll nested loops.

This makes a pretty big difference in some cases.  For example, in 183.equake,
we are now beating the native compiler with the CBE, and we are a lot closer
with LLC.

I'm now going to play around a bit with the unroll factor and see what effect
it really has.

llvm-svn: 13034

While we're at it, add support for updating loop information correctly.

llvm-svn: 13033

limited.  Even in it's extremely simple state (it can only *fully* unroll single
basic block loops that execute a constant number of times), it already helps improve
performance a LOT on some benchmarks, particularly with the native code generators.

llvm-svn: 13028