1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Target/X86/PeepholeOptimizer.cpp b/lib/Target/X86/PeepholeOptimizer.cpp
index 0c159e1698..42c985d2d6 100644
--- a/lib/Target/X86/PeepholeOptimizer.cpp
+++ b/lib/Target/X86/PeepholeOptimizer.cpp
@@ -164,7 +164,7 @@ namespace {
     // getDefinition - Return the machine instruction that defines the specified
     // SSA virtual register.
     MachineInstr *getDefinition(unsigned Reg) {
-      assert(Reg >= MRegisterInfo::FirstVirtualRegister &&
+      assert(MRegisterInfo::isVirtualRegister(Reg) &&
              "use-def chains only exist for SSA registers!");
       assert(Reg - MRegisterInfo::FirstVirtualRegister < DefiningInst.size() &&
              "Unknown register number!");