From 8d20b5f9ff609e70fae5c865931ab0f29e639d9c Mon Sep 17 00:00:00 2001
From: Chad Rosier <mcrosier@apple.com>
Date: Mon, 26 Nov 2012 23:37:07 +0000
Subject: [PATCH] Add an assertion to ensure freezeReservedRegs() is only ever
 called once.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168633 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/MachineRegisterInfo.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/CodeGen/MachineRegisterInfo.cpp b/lib/CodeGen/MachineRegisterInfo.cpp
index 95d7a7dd689..34518fa46b1 100644
--- a/lib/CodeGen/MachineRegisterInfo.cpp
+++ b/lib/CodeGen/MachineRegisterInfo.cpp
@@ -305,6 +305,8 @@ void MachineRegisterInfo::dumpUses(unsigned Reg) const {
 #endif
 
 void MachineRegisterInfo::freezeReservedRegs(const MachineFunction &MF) {
+  assert (!reservedRegsFrozen() &&
+          "freezeReservedRegs should only be called once!");
   ReservedRegs = TRI->getReservedRegs(MF);
   assert(ReservedRegs.size() == TRI->getNumRegs() &&
          "Invalid ReservedRegs vector from target");