From 54eb4c2991796c3014e831fc07e4a6c0a3df10f0 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 6 Jan 2010 19:43:21 +0000
Subject: [PATCH] Comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92850 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 8ed24cce744..352b0efe06c 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -438,6 +438,9 @@ void SelectionDAGISel::SelectBasicBlock(BasicBlock *LLVMBB,
   SDB->clear();
 }
 
+/// ShrinkDemandedOps - A late transformation pass that shrink expressions
+/// using TargetLowering::TargetLoweringOpt::ShrinkDemandedOp. It converts
+/// x+y to (VT)((SmallVT)x+(SmallVT)y) if the casts are free.
 void SelectionDAGISel::ShrinkDemandedOps() {
   SmallVector<SDNode*, 128> Worklist;
 
-- 
2.34.1