Resolve aliases, when possible
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56001 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/IPO/GlobalOpt.cpp b/lib/Transforms/IPO/GlobalOpt.cpp
index f9a7c73..8c6631a 100644
--- a/lib/Transforms/IPO/GlobalOpt.cpp
+++ b/lib/Transforms/IPO/GlobalOpt.cpp
@@ -65,6 +65,7 @@
GlobalVariable *FindGlobalCtors(Module &M);
bool OptimizeFunctions(Module &M);
bool OptimizeGlobalVars(Module &M);
+ bool ResolveAliases(Module &M);
bool OptimizeGlobalCtorsList(GlobalVariable *&GCL);
bool ProcessInternalGlobal(GlobalVariable *GV,Module::global_iterator &GVI);
};
@@ -2214,6 +2215,23 @@
return true;
}
+bool GlobalOpt::ResolveAliases(Module &M) {
+ bool Changed = false;
+
+ for (Module::alias_iterator I = M.alias_begin(),
+ E = M.alias_end(); I != E; ++I) {
+ if (I->use_empty())
+ continue;
+
+ if (const GlobalValue *GV = I->resolveAliasedGlobal(/*traverseWeak*/ false))
+ if (GV != I) {
+ I->replaceAllUsesWith(const_cast<GlobalValue*>(GV));
+ Changed = true;
+ }
+ }
+
+ return Changed;
+}
bool GlobalOpt::runOnModule(Module &M) {
bool Changed = false;
@@ -2235,6 +2253,10 @@
// Optimize non-address-taken globals.
LocalChange |= OptimizeGlobalVars(M);
Changed |= LocalChange;
+
+ // Resolve aliases, when possible.
+ LocalChange |= ResolveAliases(M);
+ Changed |= LocalChange;
}
// TODO: Move all global ctors functions to the end of the module for code