tree 88d47ce8fcb734e5cd702596dcc615c19592fb1a
parent 9c2cc4626b157ca2a7363edd0581783b5e5eb12d
author Chris Lattner <sabre@nondot.org> 1082269663 +0000
committer Chris Lattner <sabre@nondot.org> 1082269663 +0000

After unrolling our single basic block loop, fold it into the preheader and exit
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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13034 91177308-0d34-0410-b5e6-96231b3b80d8