From 36768c684f2b7ba5b9dd9874c1ddb5ecd8fbaa29 Mon Sep 17 00:00:00 2001
From: Matthias Braun <matze@braunis.de>
Date: Wed, 24 Dec 2014 02:11:46 +0000
Subject: LiveRangeEdit: Check for completely empy subranges after removing
 ValNos.

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

llvm-svn: 224804
---
 llvm/lib/CodeGen/LiveRangeEdit.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'llvm/lib/CodeGen/LiveRangeEdit.cpp')

diff --git a/llvm/lib/CodeGen/LiveRangeEdit.cpp b/llvm/lib/CodeGen/LiveRangeEdit.cpp
index 765a39a9b5e..47da205df69 100644
--- a/llvm/lib/CodeGen/LiveRangeEdit.cpp
+++ b/llvm/lib/CodeGen/LiveRangeEdit.cpp
@@ -292,6 +292,7 @@ void LiveRangeEdit::eliminateDeadDef(MachineInstr *MI, ToShrinkSet &ToShrink) {
             if (VNInfo *SVNI = S.getVNInfoAt(Idx))
               S.removeValNo(SVNI);
           }
+          LI.removeEmptySubRanges();
         }
       }
     }
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