1 files changed, 30 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86MachineFunctionInfo.cpp b/llvm/lib/Target/X86/X86MachineFunctionInfo.cpp
new file mode 100644
index 000000000000..05f846bfb219
--- /dev/null
+++ b/llvm/lib/Target/X86/X86MachineFunctionInfo.cpp
@@ -0,0 +1,30 @@
+//===-- X86MachineFunctionInfo.cpp - X86 machine function info ------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "X86MachineFunctionInfo.h"
+#include "X86RegisterInfo.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/TargetSubtargetInfo.h"
+
+using namespace llvm;
+
+void X86MachineFunctionInfo::anchor() { }
+
+void X86MachineFunctionInfo::setRestoreBasePointer(const MachineFunction *MF) {
+  if (!RestoreBasePointerOffset) {
+    const X86RegisterInfo *RegInfo = static_cast<const X86RegisterInfo *>(
+      MF->getSubtarget().getRegisterInfo());
+    unsigned SlotSize = RegInfo->getSlotSize();
+    for (const MCPhysReg *CSR = MF->getRegInfo().getCalleeSavedRegs();
+         unsigned Reg = *CSR; ++CSR) {
+      if (X86::GR64RegClass.contains(Reg) || X86::GR32RegClass.contains(Reg))
+        RestoreBasePointerOffset -= SlotSize;
+    }
+  }
+}
+