From: Xin Tong <trent.xin.tong@gmail.com>
Date: Mon, 19 Jun 2017 20:10:41 +0000 (+0000)
Subject: [BDCE] Add comments. NFC
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=b06e406fa7de198d4979625ef90673533f631047;p=llvm

[BDCE] Add comments. NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305739 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Analysis/DemandedBits.cpp b/lib/Analysis/DemandedBits.cpp
index 8f808f3e787..926b28d6094 100644
--- a/lib/Analysis/DemandedBits.cpp
+++ b/lib/Analysis/DemandedBits.cpp
@@ -107,6 +107,8 @@ void DemandedBits::determineLiveOperandBits(
         AB = AOut.byteSwap();
         break;
       case Intrinsic::bitreverse:
+        // The alive bits of the input are the reversed alive bits of
+        // the output.
         AB = AOut.reverseBits();
         break;
       case Intrinsic::ctlz: