From edad5bcb76bf472a1487c0f3dd94a5914213a647 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sat, 2 Dec 2017 12:46:23 +0000
Subject: Vendor import of llvm release_50 branch r319231:
 https://llvm.org/svn/llvm-project/llvm/branches/release_50@319231

---
 lib/CodeGen/MachineRegisterInfo.cpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'lib/CodeGen/MachineRegisterInfo.cpp')

diff --git a/lib/CodeGen/MachineRegisterInfo.cpp b/lib/CodeGen/MachineRegisterInfo.cpp
index 9a92ee279cdc..be06053f0040 100644
--- a/lib/CodeGen/MachineRegisterInfo.cpp
+++ b/lib/CodeGen/MachineRegisterInfo.cpp
@@ -601,3 +601,21 @@ void MachineRegisterInfo::setCalleeSavedRegs(ArrayRef<MCPhysReg> CSRs) {
   UpdatedCSRs.push_back(0);
   IsUpdatedCSRsInitialized = true;
 }
+
+bool MachineRegisterInfo::isReservedRegUnit(unsigned Unit) const {
+  const TargetRegisterInfo *TRI = getTargetRegisterInfo();
+  for (MCRegUnitRootIterator Root(Unit, TRI); Root.isValid(); ++Root) {
+    bool IsRootReserved = true;
+    for (MCSuperRegIterator Super(*Root, TRI, /*IncludeSelf=*/true);
+         Super.isValid(); ++Super) {
+      unsigned Reg = *Super;
+      if (!isReserved(Reg)) {
+        IsRootReserved = false;
+        break;
+      }
+    }
+    if (IsRootReserved)
+      return true;
+  }
+  return false;
+}
-- 
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