Add assert to isPhysicalRegister and isVirtualRegister to fail when

passed the special 'register' 0.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11842 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 0 deletions

diff --git a/include/llvm/Target/MRegisterInfo.h b/include/llvm/Target/MRegisterInfo.h
index 0a83ac2ae3..4383e72923 100644
--- a/include/llvm/Target/MRegisterInfo.h
+++ b/include/llvm/Target/MRegisterInfo.h
@@ -141,12 +141,14 @@ public:
   /// isPhysicalRegister - Return true if the specified register number is in
   /// the physical register namespace.
   static bool isPhysicalRegister(unsigned Reg) {
+    assert(Reg && "this is not a register!";
     return Reg < FirstVirtualRegister;
   }
 
   /// isVirtualRegister - Return true if the specified register number is in
   /// the virtual register namespace.
   static bool isVirtualRegister(unsigned Reg) {
+    assert(Reg && "this is not a register!";
     return Reg >= FirstVirtualRegister;
   }