From: Chandler Carruth <chandlerc@gmail.com>
Date: Sat, 24 Jan 2015 10:32:53 +0000 (+0000)
Subject: [PM] Add a basic doxygen comment for this pass.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=0a9ef5f8c2c6806711c56a9cba806aeac21283e7;p=oota-llvm.git

[PM] Add a basic doxygen comment for this pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226993 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp b/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp
index 3a0474279a6..2a11f9a4f54 100644
--- a/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp
+++ b/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp
@@ -40,6 +40,12 @@ UnlikelyBranchWeight("unlikely-branch-weight", cl::Hidden, cl::init(4),
                    cl::desc("Weight of the branch unlikely to be taken (default = 4)"));
 
 namespace {
+/// \brief Legacy pass for lowering expect intrinsics out of the IR.
+///
+/// When this pass is run over a function it uses expect intrinsics which feed
+/// branches and switches to provide branch weight metadata for those
+/// terminators. It then removes the expect intrinsics from the IR so the rest
+/// of the optimizer can ignore them.
 class LowerExpectIntrinsic : public FunctionPass {
 
   bool HandleSwitchExpect(SwitchInst *SI);