commit fe896c703c2fe30ef7b21b2bfe8fcc023271ebe1
author Matthias Braun <matze@braunis.de> Wed Dec 10 01:12:23 2014 +0000
committer Matthias Braun <matze@braunis.de> Wed Dec 10 01:12:23 2014 +0000
tree 45752f93c0df0859b416859750c29457fbd01d3e
parent 7044d69e875f0b7a561290823bd34fe71748560d

LiveRangeEdit: Adapt eliminateDeadDef() to subregister liveness.

llvm-svn: 223882

llvm/lib/CodeGen/LiveRangeEdit.cpp

diff --git a/llvm/lib/CodeGen/LiveRangeEdit.cpp b/llvm/lib/CodeGen/LiveRangeEdit.cpp
index a0fb712..634e93d 100644
--- a/llvm/lib/CodeGen/LiveRangeEdit.cpp
+++ b/llvm/lib/CodeGen/LiveRangeEdit.cpp
@@ -286,8 +286,16 @@
         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);
+          }
+        }
       }
     }
   }