vendor/llvm-project/llvmorg-10.0.0-rc2-70-ge5cb70267e7

1 files changed, 0 insertions, 27 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index e5bc08b9280a..8ff04797c8d8 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -16510,33 +16510,6 @@ SDValue DAGCombiner::visitSTORE(SDNode *N) {
           CombineTo(ST1, ST1->getChain());
           return SDValue();
         }
-
-        // If ST stores to a subset of preceding store's write set, we may be
-        // able to fold ST's value into the preceding stored value. As we know
-        // the other uses of ST1's chain are unconcerned with ST, this folding
-        // will not affect those nodes.
-        int64_t BitOffset;
-        if (ChainBase.contains(DAG, ChainBitSize, STBase, STBitSize,
-                               BitOffset)) {
-          SDValue ChainValue = ST1->getValue();
-          if (auto *C1 = dyn_cast<ConstantSDNode>(ChainValue)) {
-            if (auto *C = dyn_cast<ConstantSDNode>(Value)) {
-              APInt Val = C1->getAPIntValue();
-              APInt InsertVal = C->getAPIntValue().zextOrTrunc(STBitSize);
-              // FIXME: Handle Big-endian mode.
-              if (!DAG.getDataLayout().isBigEndian()) {
-                Val.insertBits(InsertVal, BitOffset);
-                SDValue NewSDVal =
-                    DAG.getConstant(Val, SDLoc(C), ChainValue.getValueType(),
-                                    C1->isTargetOpcode(), C1->isOpaque());
-                SDNode *NewST1 = DAG.UpdateNodeOperands(
-                    ST1, ST1->getChain(), NewSDVal, ST1->getOperand(2),
-                    ST1->getOperand(3));
-                return CombineTo(ST, SDValue(NewST1, 0));
-              }
-            }
-          }
-        } // End ST subset of ST1 case.
       }
     }
   }