1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Target/SystemZ/SystemZRegisterInfo.cpp b/lib/Target/SystemZ/SystemZRegisterInfo.cpp
index b5e5fd4bfc4f..6ef8000d6f43 100644
--- a/lib/Target/SystemZ/SystemZRegisterInfo.cpp
+++ b/lib/Target/SystemZ/SystemZRegisterInfo.cpp
@@ -59,6 +59,11 @@ SystemZRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
   Reserved.set(SystemZ::R15L);
   Reserved.set(SystemZ::R15H);
   Reserved.set(SystemZ::R14Q);
+
+  // A0 and A1 hold the thread pointer.
+  Reserved.set(SystemZ::A0);
+  Reserved.set(SystemZ::A1);
+
   return Reserved;
 }