fix rdar://8494845 + PR8244 - a miscompile exposed by my patch in r101350

[oota-llvm.git] / lib / CodeGen / SelectionDAG / DAGCombiner.cpp

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index be95c08e2fc89a6893332c04d76860b3b4cb9ab8..ede54e5ed23a00ceec16cdc60a6c7457a869d5bb 100644 (file)
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -4087,6 +4087,15 @@ SDValue DAGCombiner::ReduceLoadWidth(SDNode *N) {
         if ((N0.getValueType().getSizeInBits() & (EVTBits-1)) != 0)
           return SDValue();
       }
+      
+      // If the shift amount is larger than the input type then we're not
+      // accessing any of the loaded bytes.  If the load was a zextload/extload
+      // then the result of the shift+trunc is zero/undef (handled elsewhere).
+      // If the load was a sextload then the result is a splat of the sign bit
+      // of the extended byte.  This is not worth optimizing for.
+      if (ShAmt >= VT.getSizeInBits())
+        return SDValue();
+      
     }
   }