[llvm] r299618 - foo

[Craig Topper via llvm-commits]

Author: ctopper
Date: Wed Apr  5 23:02:28 2017
New Revision: 299618

URL: http://llvm.org/viewvc/llvm-project?rev=299618&view=rev
Log:
foo

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp?rev=299618&r1=299617&r2=299618&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp Wed Apr  5 23:02:28 2017
@@ -791,6 +791,9 @@ bool TargetLowering::SimplifyDemandedBit
       // 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: