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-rw-r--r--lib/CodeGen/VirtRegMap.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/CodeGen/VirtRegMap.cpp b/lib/CodeGen/VirtRegMap.cpp
index 26498b7ec1..f27ae2a821 100644
--- a/lib/CodeGen/VirtRegMap.cpp
+++ b/lib/CodeGen/VirtRegMap.cpp
@@ -393,6 +393,7 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, const VirtRegMap &VRM) {
// Otherwise, reload it and remember that we have it.
PhysReg = VRM.getPhys(VirtReg);
+ assert(PhysReg && "Must map virtreg to physreg!");
const TargetRegisterClass* RC =
MBB.getParent()->getSSARegMap()->getRegClass(VirtReg);