Avoid repeated calls to Op.getOpcode(). NFCI.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288814 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index fc0cdee..297a7c3 100644 (file)
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2039,7 +2039,8 @@ void SelectionDAG::computeKnownBits(SDValue Op, APInt &KnownZero,
   if (!DemandedElts)
     return;  // No demanded elts, better to assume we don't know anything.
 
-  switch (Op.getOpcode()) {
+  unsigned Opcode = Op.getOpcode();
+  switch (Opcode) {
   case ISD::Constant:
     // We know all of the bits for a constant!
     KnownOne = cast<ConstantSDNode>(Op)->getAPIntValue();
@@ -2478,7 +2479,7 @@ void SelectionDAG::computeKnownBits(SDValue Op, APInt &KnownZero,
     KnownZeroLow = std::min(KnownZeroLow,
                             KnownZero2.countTrailingOnes());
 
-    if (Op.getOpcode() == ISD::ADD) {
+    if (Opcode == ISD::ADD) {
       KnownZero |= APInt::getLowBitsSet(BitWidth, KnownZeroLow);
       if (KnownZeroHigh > 1)
         KnownZero |= APInt::getHighBitsSet(BitWidth, KnownZeroHigh - 1);
@@ -2622,7 +2623,7 @@ void SelectionDAG::computeKnownBits(SDValue Op, APInt &KnownZero,
     break;
 
   default:
-    if (Op.getOpcode() < ISD::BUILTIN_OP_END)
+    if (Opcode < ISD::BUILTIN_OP_END)
       break;
     LLVM_FALLTHROUGH;
   case ISD::INTRINSIC_WO_CHAIN: