Revert rL255391: [X86ISelLowering] Add additional support for multiplication-to-shift...

[oota-llvm.git] / lib / Target / X86 / X86ISelLowering.cpp

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 1de926bf41f9a2448bc496896e94f08c708e6ea6..b1b7f5d458653d87bf7d1c03770b87a1420328e6 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -24738,11 +24738,9 @@ static SDValue PerformMulCombine(SDNode *N, SelectionDAG &DAG,
     MulAmt1 = 3;
     MulAmt2 = MulAmt / 3;
   }
-
-  SDLoc DL(N);
-  SDValue NewMul;
   if (MulAmt2 &&
       (isPowerOf2_64(MulAmt2) || MulAmt2 == 3 || MulAmt2 == 5 || MulAmt2 == 9)){
+    SDLoc DL(N);
 
     if (isPowerOf2_64(MulAmt2) &&
         !(N->hasOneUse() && N->use_begin()->getOpcode() == ISD::ADD))
@@ -24751,6 +24749,7 @@ static SDValue PerformMulCombine(SDNode *N, SelectionDAG &DAG,
       // is an add.
       std::swap(MulAmt1, MulAmt2);
 
+    SDValue NewMul;
     if (isPowerOf2_64(MulAmt1))
       NewMul = DAG.getNode(ISD::SHL, DL, VT, N->getOperand(0),
                            DAG.getConstant(Log2_64(MulAmt1), DL, MVT::i8));
@@ -24764,32 +24763,10 @@ static SDValue PerformMulCombine(SDNode *N, SelectionDAG &DAG,
     else
       NewMul = DAG.getNode(X86ISD::MUL_IMM, DL, VT, NewMul,
                            DAG.getConstant(MulAmt2, DL, VT));
-  }
-
-  if (!NewMul) {
-    uint64_t MaxVal = VT == MVT::i64 ? UINT64_MAX : UINT32_MAX;
-    assert(MulAmt != 0 && MulAmt != MaxVal &&
-           "Both cases that could cause potential "
-           "overflows should have already been handled.");
-    if (isPowerOf2_64(MulAmt - 1))
-      // (mul x, 2^N + 1) => (add (shl x, N), x)
-      NewMul = DAG.getNode(ISD::ADD, DL, VT, N->getOperand(0),
-                                DAG.getNode(ISD::SHL, DL, VT, N->getOperand(0),
-                                DAG.getConstant(Log2_64(MulAmt - 1), DL,
-                                MVT::i8)));
 
-    else if (isPowerOf2_64(MulAmt + 1))
-      // (mul x, 2^N - 1) => (sub (shl x, N), x)
-      NewMul = DAG.getNode(ISD::SUB, DL, VT, DAG.getNode(ISD::SHL, DL, VT,
-                                N->getOperand(0),
-                                DAG.getConstant(Log2_64(MulAmt + 1),
-                                DL, MVT::i8)), N->getOperand(0));
-  }
-
-  if (NewMul)
     // Do not add new nodes to DAG combiner worklist.
     DCI.CombineTo(N, NewMul, false);
-
+  }
   return SDValue();
 }