Added a common about the need for X86ISD::Wrapper.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26372 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index e2f22ae..48e049c 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -1829,6 +1829,13 @@
return DAG.getNode(X86ISD::REP_MOVS, MVT::Other, Chain,
DAG.getValueType(AVT), InFlag);
}
+
+ // ConstantPool, GlobalAddress, and ExternalSymbol are lowered as their
+ // target countpart wrapped in the X86ISD::Wrapper node. Suppose N is
+ // one of the above mentioned nodes. It has to be wrapped because otherwise
+ // Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
+ // be used to form addressing mode. These wrapped nodes will be selected
+ // into MOV32ri.
case ISD::ConstantPool: {
ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
SDOperand Result = DAG.getNode(X86ISD::Wrapper, getPointerTy(),