diff --git a/llvm/lib/CodeGen/LiveRangeCalc.cpp b/llvm/lib/CodeGen/LiveRangeCalc.cpp
--- a/llvm/lib/CodeGen/LiveRangeCalc.cpp
+++ b/llvm/lib/CodeGen/LiveRangeCalc.cpp
@@ -216,15 +216,6 @@
         errs() << Use << " " << *MI;
       report_fatal_error("Use not jointly dominated by defs.");
     }
-
-    if (Register::isPhysicalRegister(PhysReg) && !MBB->isLiveIn(PhysReg)) {
-      MBB->getParent()->verify();
-      const TargetRegisterInfo *TRI = MRI->getTargetRegisterInfo();
-      errs() << "The register " << printReg(PhysReg, TRI)
-             << " needs to be live in to " << printMBBReference(*MBB)
-             << ", but is missing from the live-in list.\n";
-      report_fatal_error("Invalid global physical register");
-    }
 #endif
     FoundUndef |= MBB->pred_empty();