Fix code gen crash reported in PR 8235. We still lose debug info for the unused argument here. This is a known limitation recorded debuginfo-tests/trunk/dbg-declare2.ll function 'f6' test case.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115323 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index fca9893..88a0f7b 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -3955,6 +3955,9 @@
const TargetRegisterInfo *TRI = DAG.getTarget().getRegisterInfo();
Reg = TRI->getFrameRegister(MF);
Offset = FuncInfo.getByValArgumentFrameIndex(Arg);
+ // If byval argument ofset is not recorded then ignore this.
+ if (!Offset)
+ Reg = 0;
}
if (N.getNode() && N.getOpcode() == ISD::CopyFromReg) {