[llvm] r339757 - [DagCombiner] Don't bother adding to the work list if TLI.BuildSDIVPow2 failed. NFCI.

[Simon Pilgrim via llvm-commits]

Author: rksimon
Date: Wed Aug 15 03:02:54 2018
New Revision: 339757

URL: http://llvm.org/viewvc/llvm-project?rev=339757&view=rev
Log:
[DagCombiner] Don't bother adding to the work list if TLI.BuildSDIVPow2 failed. NFCI.

Matches the code in BuildSDIV/BuildUDIV

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

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp?rev=339757&r1=339756&r2=339757&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Wed Aug 15 03:02:54 2018
@@ -18089,11 +18089,13 @@ SDValue DAGCombiner::BuildSDIVPow2(SDNod
     return SDValue();
 
   SmallVector<SDNode *, 8> Built;
-  SDValue S = TLI.BuildSDIVPow2(N, C->getAPIntValue(), DAG, Built);
+  if (SDValue S = TLI.BuildSDIVPow2(N, C->getAPIntValue(), DAG, Built)) {
+    for (SDNode *N : Built)
+      AddToWorklist(N);
+    return S;
+  }
 
-  for (SDNode *N : Built)
-    AddToWorklist(N);
-  return S;
+  return SDValue();
 }
 
 /// Given an ISD::UDIV node expressing a divide by constant, return a DAG