From: Matthias Braun <matze@braunis.de>
Date: Wed, 10 Dec 2014 01:12:23 +0000 (+0000)
Subject: LiveRangeEdit: Adapt eliminateDeadDef() to subregister liveness.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c7db66d4961dd4340a386043593f153a4af38dc6;p=oota-llvm.git

LiveRangeEdit: Adapt eliminateDeadDef() to subregister liveness.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223882 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/LiveRangeEdit.cpp b/lib/CodeGen/LiveRangeEdit.cpp
index a0fb712d118..634e93de69d 100644
--- a/lib/CodeGen/LiveRangeEdit.cpp
+++ b/lib/CodeGen/LiveRangeEdit.cpp
@@ -286,8 +286,16 @@ void LiveRangeEdit::eliminateDeadDef(MachineInstr *MI, ToShrinkSet &ToShrink) {
         if (TheDelegate)
           TheDelegate->LRE_WillShrinkVirtReg(LI.reg);
         LI.removeValNo(VNI);
-        if (LI.empty())
+        if (LI.empty()) {
           RegsToErase.push_back(Reg);
+        } else {
+          // Also remove the value in subranges.
+          for (LiveInterval::subrange_iterator S = LI.subrange_begin(),
+               SE = LI.subrange_end(); S != SE; ++S) {
+            if (VNInfo *SVNI = S->getVNInfoAt(Idx))
+              S->removeValNo(SVNI);
+          }
+        }
       }
     }
   }