[llvm] r313891 - [DAGCombiner] Remove duplicate code from visitZERO_EXTEND

[Craig Topper via llvm-commits]

Author: ctopper
Date: Thu Sep 21 10:30:02 2017
New Revision: 313891

URL: http://llvm.org/viewvc/llvm-project?rev=313891&view=rev
Log:
[DAGCombiner] Remove duplicate code from visitZERO_EXTEND

This exact block of code exists right below.

Differential Revision: https://reviews.llvm.org/D38122

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=313891&r1=313890&r2=313891&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Thu Sep 21 10:30:02 2017
@@ -7558,20 +7558,6 @@ SDValue DAGCombiner::visitZERO_EXTEND(SD
       return DAG.getZExtOrTrunc(Op, SDLoc(N), VT);
   }
 
-  // fold (zext (truncate (load x))) -> (zext (smaller load x))
-  // fold (zext (truncate (srl (load x), c))) -> (zext (small load (x+c/n)))
-  if (N0.getOpcode() == ISD::TRUNCATE) {
-    if (SDValue NarrowLoad = ReduceLoadWidth(N0.getNode())) {
-      SDNode *oye = N0.getOperand(0).getNode();
-      if (NarrowLoad.getNode() != N0.getNode()) {
-        CombineTo(N0.getNode(), NarrowLoad);
-        // CombineTo deleted the truncate, if needed, but not what's under it.
-        AddToWorklist(oye);
-      }
-      return SDValue(N, 0);   // Return N so it doesn't get rechecked!
-    }
-  }
-
   // fold (zext (truncate x)) -> (and x, mask)
   if (N0.getOpcode() == ISD::TRUNCATE) {
     // fold (zext (truncate (load x))) -> (zext (smaller load x))