[CodeGen] Ignore debug uses in MachineCopyPropagation
Debug uses should not count as real uses, since the presence of debug
information could affect the generated code.
llvm-svn: 336803
diff --git a/llvm/lib/CodeGen/MachineCopyPropagation.cpp b/llvm/lib/CodeGen/MachineCopyPropagation.cpp
index d3bdc77..3bf8147 100644
--- a/llvm/lib/CodeGen/MachineCopyPropagation.cpp
+++ b/llvm/lib/CodeGen/MachineCopyPropagation.cpp
@@ -517,7 +517,7 @@
if (MO.isDef() && !MO.isEarlyClobber()) {
Defs.push_back(Reg);
continue;
- } else if (MO.readsReg())
+ } else if (!MO.isDebug() && MO.readsReg())
ReadRegister(Reg);
}