[llvm-commits] [llvm] r77890 - /llvm/trunk/lib/CodeGen/MachineVerifier.cpp

[Jakob Stoklund Olesen]

Author: stoklund
Date: Sun Aug  2 02:38:21 2009
New Revision: 77890

URL: http://llvm.org/viewvc/llvm-project?rev=77890&view=rev
Log:
Handle <undef> flag in machine code verifier.

Use of an <undef> register is treated like an <imp-use>. It is not an error to use a dead <undef> register.

Modified:
    llvm/trunk/lib/CodeGen/MachineVerifier.cpp

Modified: llvm/trunk/lib/CodeGen/MachineVerifier.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/MachineVerifier.cpp?rev=77890&r1=77889&r2=77890&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/MachineVerifier.cpp (original)
+++ llvm/trunk/lib/CodeGen/MachineVerifier.cpp Sun Aug  2 02:38:21 2009
@@ -365,7 +365,8 @@
           addRegWithSubRegs(regsKilled, Reg);
       }
       // Explicit use of a dead register.
-      if (!MO->isImplicit() && !regsLive.count(Reg)) {
+      // A register use marked <undef> is OK.
+      if (!MO->isImplicit() && !MO->isUndef() && !regsLive.count(Reg)) {
         if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
           // Reserved registers may be used even when 'dead'.
           if (!isReserved(Reg))