[llvm] r223882 - LiveRangeEdit: Adapt eliminateDeadDef() to subregister liveness.

[Matthias Braun]

Author: matze
Date: Tue Dec  9 19:12:23 2014
New Revision: 223882

URL: http://llvm.org/viewvc/llvm-project?rev=223882&view=rev
Log:
LiveRangeEdit: Adapt eliminateDeadDef() to subregister liveness.

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=223882&r1=223881&r2=223882&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp (original)
+++ llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp Tue Dec  9 19:12:23 2014
@@ -286,8 +286,16 @@ void LiveRangeEdit::eliminateDeadDef(Mac
         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);
+          }
+        }
       }
     }
   }