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

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226993 91177308-0d34-0410-b5e6-96231b3b80d8
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Chandler Carruth
2015-01-24 10:32:53 +00:00
parent 1928e50d07
commit 0a9ef5f8c2
1 changed files with 6 additions and 0 deletions
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6
lib/Transforms/Scalar/LowerExpectIntrinsic.cpp
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@@ -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)")); cl::desc("Weight of the branch unlikely to be taken (default = 4)"));
namespace { 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 { class LowerExpectIntrinsic : public FunctionPass {
bool HandleSwitchExpect(SwitchInst *SI); bool HandleSwitchExpect(SwitchInst *SI);