[X86] Attempt to fix use-after-poison from r359121.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@359143 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86ISelDAGToDAG.cpp b/lib/Target/X86/X86ISelDAGToDAG.cpp
index dd387e5e57c61e819c4cc932fa8cac3a2f79ec71..6cf7833e180d8a418132ecfeb32ffc4509e83042 100644 (file)
--- a/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -2066,10 +2066,13 @@ bool X86DAGToDAGISel::selectAddr(SDNode *Parent, SDValue N, SDValue &Base,
       AM.Segment = CurDAG->getRegister(X86::SS, MVT::i16);
   }
 
+  // Save the DL and VT before calling matchAddress, it can invalidate N.
+  SDLoc DL(N);
+  MVT VT = N.getSimpleValueType();
+
   if (matchAddress(N, AM))
     return false;
 
-  MVT VT = N.getSimpleValueType();
   if (AM.BaseType == X86ISelAddressMode::RegBase) {
     if (!AM.Base_Reg.getNode())
       AM.Base_Reg = CurDAG->getRegister(0, VT);
@@ -2078,7 +2081,7 @@ bool X86DAGToDAGISel::selectAddr(SDNode *Parent, SDValue N, SDValue &Base,
   if (!AM.IndexReg.getNode())
     AM.IndexReg = CurDAG->getRegister(0, VT);
 
-  getAddressOperands(AM, SDLoc(N), Base, Scale, Index, Disp, Segment);
+  getAddressOperands(AM, DL, Base, Scale, Index, Disp, Segment);
   return true;
 }