[llvm-commits] [llvm] r157515 - in /llvm/trunk: include/llvm/Support/MDBuilder.h lib/Transforms/Utils/LowerExpectIntrinsic.cpp lib/Transforms/Utils/SimplifyCFG.cpp

[Andrew Trick]

On May 26, 2012, at 6:59 AM, Benjamin Kramer <benny.kra at googlemail.com> wrote:

> Author: d0k
> Date: Sat May 26 08:59:43 2012
> New Revision: 157515
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=157515&view=rev
> Log:
> Add support for branch weight metadata to MDBuilder and use it in various places.
> 
> Modified:
>    llvm/trunk/include/llvm/Support/MDBuilder.h
>    llvm/trunk/lib/Transforms/Utils/LowerExpectIntrinsic.cpp
>    llvm/trunk/lib/Transforms/Utils/SimplifyCFG.cpp


It might be straightforward to preserve branch weights in SimplifyBranchOnICmpChain. No one seems to have gotten around to it yet ;-)

We may end up with bloated metadata for some switches because we require an entry for every case. We could loosen the metadata requirements if that's a problem.

-Andy