Do not try to optimize a copy that has already been marked for deletion.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102027 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp
index 78011ed67f..543278b467 100644
--- a/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -804,7 +804,8 @@ SimpleRegisterCoalescing::UpdateRegDefsUses(unsigned SrcReg, unsigned DstReg,
           CopySrcReg == SrcReg && CopyDstReg != UseDstReg) {
         // If the use is a copy and it won't be coalesced away, and its source
         // is defined by a trivial computation, try to rematerialize it instead.
-        if (ReMaterializeTrivialDef(li_->getInterval(SrcReg), CopyDstReg,
+        if (!JoinedCopies.count(UseMI) &&
+            ReMaterializeTrivialDef(li_->getInterval(SrcReg), CopyDstReg,
                                     CopyDstSubIdx, UseMI))
           continue;
       }