Teach ScalarEvolution about GlobalAliases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80014 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index ca2cdca673cab6704face70e52a620f644bbddd7..33d8a18412d0eee477f7d96de9d411493ac92289 100644 (file)
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -63,6 +63,7 @@
 #include "llvm/Constants.h"
 #include "llvm/DerivedTypes.h"
 #include "llvm/GlobalVariable.h"
+#include "llvm/GlobalAlias.h"
 #include "llvm/Instructions.h"
 #include "llvm/LLVMContext.h"
 #include "llvm/Operator.h"
@@ -2906,6 +2907,8 @@ const SCEV *ScalarEvolution::createSCEV(Value *V) {
     return getIntegerSCEV(0, V->getType());
   else if (isa<UndefValue>(V))
     return getIntegerSCEV(0, V->getType());
+  else if (GlobalAlias *GA = dyn_cast<GlobalAlias>(V))
+    return GA->mayBeOverridden() ? getUnknown(V) : getSCEV(GA->getAliasee());
   else
     return getUnknown(V);