From: Matthias Braun <matze@braunis.de>
Date: Wed, 24 Dec 2014 02:11:46 +0000 (+0000)
Subject: LiveRangeEdit: Check for completely empy subranges after removing ValNos.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a2fd5b5fd0a60854e92d1d202d48d37fb16cef69;p=oota-llvm.git

LiveRangeEdit: Check for completely empy subranges after removing ValNos.

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224804 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/LiveRangeEdit.cpp b/lib/CodeGen/LiveRangeEdit.cpp
index 765a39a9b5e..47da205df69 100644
--- a/lib/CodeGen/LiveRangeEdit.cpp
+++ b/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();
         }
       }
     }