[PATCH] D12341: add llvm.unpredictable intrinsic and lower it to metadata

[Sanjay Patel via llvm-commits]

spatel added a comment.

In http://reviews.llvm.org/D12341#234312, @hfinkel wrote:

> Can you please explain why you're adding this intrinsic, instead of just adding branch-probability metadata from the frontend?


Hi Hal -

See my earlier question. My reason for implementing it this way was simply because this is the way it's already done for llvm.expect...so I assume there's some case that's better served by having an intrinsic? If that's not true, then certainly this unpredictable hint could be a lot simpler and so could the expect hint?


http://reviews.llvm.org/D12341