[llvm] r224804 - LiveRangeEdit: Check for completely empy subranges after removing ValNos.

[Matthias Braun]

Author: matze
Date: Tue Dec 23 20:11:46 2014
New Revision: 224804

URL: http://llvm.org/viewvc/llvm-project?rev=224804&view=rev
Log:
LiveRangeEdit: Check for completely empy subranges after removing ValNos.

Completely empty subranges are not allowed and must be removed when
subreg liveness is enabled.

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

Modified: llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp?rev=224804&r1=224803&r2=224804&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp (original)
+++ llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp Tue Dec 23 20:11:46 2014
@@ -292,6 +292,7 @@ void LiveRangeEdit::eliminateDeadDef(Mac
             if (VNInfo *SVNI = S.getVNInfoAt(Idx))
               S.removeValNo(SVNI);
           }
+          LI.removeEmptySubRanges();
         }
       }
     }