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Resolve aliases, when possible

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56001 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2008-09-09 19:04:59 +00:00
parent bd297bcd4a
commit e4c6b61ebd
2 changed files with 41 additions and 0 deletions
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lib/Transforms/IPO/GlobalOpt.cpp
+22
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@@ -65,6 +65,7 @@ namespace {
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 @@ bool GlobalOpt::OptimizeGlobalCtorsList(GlobalVariable *&GCL) {
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 @@ bool GlobalOpt::runOnModule(Module &M) {
// 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