Tweak the LICM code to reuse the first sub-loop instead of creating a new one
LICM starts with an *empty* AST, and then merges in each sub-loop. While the
add code is appropriate for sub-loop 2 and up, it's utterly unnecessary for
sub-loop 1. If the AST starts off empty, we can just clone/move the contents
of the subloop into the containing AST.
Reviewed-by: Philip Reames <listmail@philipreames.com>
Differential Revision: http://reviews.llvm.org/D16753
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260892 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed