GlobalVariable *FindGlobalCtors(Module &M);
bool OptimizeFunctions(Module &M);
bool OptimizeGlobalVars(Module &M);
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);
};
bool OptimizeGlobalCtorsList(GlobalVariable *&GCL);
bool ProcessInternalGlobal(GlobalVariable *GV,Module::global_iterator &GVI);
};
+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;
bool GlobalOpt::runOnModule(Module &M) {
bool Changed = false;
// Optimize non-address-taken globals.
LocalChange |= OptimizeGlobalVars(M);
Changed |= LocalChange;
// 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
}
// TODO: Move all global ctors functions to the end of the module for code
--- /dev/null
+; RUN: llvm-as < %s | opt -globalopt | llvm-dis > %t
+; RUN: cat %t | grep foo1 | count 1
+; RUN: cat %t | grep foo2 | count 4
+; RUN: cat %t | grep bar1 | count 1
+; RUN: cat %t | grep bar2 | count 4
+
+@foo1 = alias void ()* @foo2
+@foo2 = alias weak void()* @bar1
+@bar1 = alias void ()* @bar2
+
+declare void @bar2()
+
+define void @baz() {
+entry:
+ call void @foo1()
+ call void @foo2()
+ call void @bar1()
+ ret void
+}