Eliminate dead code after remat.

This will remove the original def once it has no more uses.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157104 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp
index 3204eff9cbb0227f352097d916e9a57c7e5b1631..7126bdd16740684206424925320e718b185e1b39 100644 (file)
--- a/lib/CodeGen/RegisterCoalescer.cpp
+++ b/lib/CodeGen/RegisterCoalescer.cpp
@@ -870,7 +870,9 @@ bool RegisterCoalescer::reMaterializeTrivialDef(LiveInterval &SrcInt,
   ++NumReMats;
 
   // The source interval can become smaller because we removed a use.
-  LIS->shrinkToUses(&SrcInt);
+  LIS->shrinkToUses(&SrcInt, &DeadDefs);
+  if (!DeadDefs.empty())
+    eliminateDeadDefs();
 
   return true;
 }