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Resolve aliases, when possible

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llvm-svn: 56001
This commit is contained in:
Anton Korobeynikov 2008-09-09 19:04:59 +00:00
parent 727b25981a
commit 4676c09dc8
2 changed files with 41 additions and 0 deletions
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22
lib/Transforms/IPO/GlobalOpt.cpp
View File

@ -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

19
test/Transforms/GlobalOpt/alias-resolve.ll Normal file
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@ -0,0 +1,19 @@
; 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
}