Reset "undef" flag when coalescing subregister into whole register

llvm-svn: 279344

diff --git a/llvm/lib/CodeGen/RegisterCoalescer.cpp b/llvm/lib/CodeGen/RegisterCoalescer.cpp
index 2d9a61b..bf7aacc 100644 (file)
--- a/llvm/lib/CodeGen/RegisterCoalescer.cpp
+++ b/llvm/lib/CodeGen/RegisterCoalescer.cpp
@@ -975,6 +975,7 @@ bool RegisterCoalescer::reMaterializeTrivialDef(const CoalescerPair &CP,
         NewRC = CommonRC;
         DstIdx = 0;
         DefMO.setSubReg(0);
+        DefMO.setIsUndef(false); // Only subregs can have def+undef.
       }
     }
   }