[PATCH] D38122: [DAGCombiner] Remove duplicate code from visitZERO_EXTEND

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
Herald added a subscriber: wdng.

This exact block of code exists right below.


https://reviews.llvm.org/D38122

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp


Index: lib/CodeGen/SelectionDAG/DAGCombiner.cpp
===================================================================
--- lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -7558,20 +7558,6 @@
       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))


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