[llvm] r257940 - [SelectionDAG] CSE nodes with differing SDNodeFlags

[Hans Wennborg via llvm-commits]

James, is this something that needs to be merged to 3.8?

On Fri, Jan 15, 2016 at 1:56 PM, Dan Gohman via llvm-commits
<llvm-commits at lists.llvm.org> wrote:
> Author: djg
> Date: Fri Jan 15 15:56:40 2016
> New Revision: 257940
>
> URL: http://llvm.org/viewvc/llvm-project?rev=257940&view=rev
> Log:
> [SelectionDAG] CSE nodes with differing SDNodeFlags
>
> In the optimizer (GVN etc.) when eliminating redundant nodes with different
> flags, the flags are ignored for the purposes of testing for congruence, and
> then intersected for the purposes of producing a result that supports the union
> of all the uses. This commit makes SelectionDAG's CSE do the same thing,
> allowing it to CSE nodes in more cases. This fixes PR26063.
>
> Differential Revision: http://reviews.llvm.org/D15957