[TargetLowering] SimplifyDemandedBits - only reduce known bits for integer constants

Avoids fuzzing crash found by Mikael Holmén.

llvm-svn: 347393

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 47c363f3143..0a7ba894866 100644
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -1361,7 +1361,9 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op,
         if (C->isOpaque())
           return false;
     }
-    return TLO.CombineTo(Op, TLO.DAG.getConstant(Known.One, dl, VT));
+    // TODO: Handle float bits as well.
+    if (VT.isInteger())
+      return TLO.CombineTo(Op, TLO.DAG.getConstant(Known.One, dl, VT));
   }
 
   return false;