1 files changed, 5 insertions, 2 deletions
diff --git a/contrib/llvm-project/llvm/lib/Target/AArch64/GISel/AArch64CallLowering.cpp b/contrib/llvm-project/llvm/lib/Target/AArch64/GISel/AArch64CallLowering.cpp
index e78d8bb487a9..c56e3373d3a7 100644
--- a/contrib/llvm-project/llvm/lib/Target/AArch64/GISel/AArch64CallLowering.cpp
+++ b/contrib/llvm-project/llvm/lib/Target/AArch64/GISel/AArch64CallLowering.cpp
@@ -829,9 +829,9 @@ bool AArch64CallLowering::doCallerAndCalleePassArgsTheSameWay(
 
 bool AArch64CallLowering::areCalleeOutgoingArgsTailCallable(
     CallLoweringInfo &Info, MachineFunction &MF,
-    SmallVectorImpl<ArgInfo> &OutArgs) const {
+    SmallVectorImpl<ArgInfo> &OrigOutArgs) const {
   // If there are no outgoing arguments, then we are done.
-  if (OutArgs.empty())
+  if (OrigOutArgs.empty())
     return true;
 
   const Function &CallerF = MF.getFunction();
@@ -851,6 +851,9 @@ bool AArch64CallLowering::areCalleeOutgoingArgsTailCallable(
 
   AArch64OutgoingValueAssigner CalleeAssigner(AssignFnFixed, AssignFnVarArg,
                                               Subtarget, /*IsReturn*/ false);
+  // determineAssignments() may modify argument flags, so make a copy.
+  SmallVector<ArgInfo, 8> OutArgs;
+  append_range(OutArgs, OrigOutArgs);
   if (!determineAssignments(CalleeAssigner, OutArgs, OutInfo)) {
     LLVM_DEBUG(dbgs() << "... Could not analyze call operands.\n");
     return false;