From 5c2c633a8d2007206789934214f823ec5b08a435 Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper@gmail.com>
Date: Thu, 6 Apr 2017 04:02:28 +0000
Subject: [PATCH] foo

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@299618 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/TargetLowering.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index d3ccdcd5ffd..753e5281bfc 100644
--- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -791,6 +791,9 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op,
       // TODO: Should we check for other forms of sign-bit comparisons?
       // Examples: X <= -1, X >= 0
     }
+    if (getBooleanContents(Op.getOperand(0).getValueType()) ==
+            BooleanContent::ZeroOrOneBooleanContent && BitWidth > 1)
+      KnownZero.setBitsFrom(1);
     break;
   }
   case ISD::SHL:
-- 
2.50.1