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Remove an unused function SafeToDestroyConstant(). Rename an almost

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identical function ConstantIsDead() to SafeToDestroyConstant(), to
emphasise the connection with Constant::destroyConstant().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73149 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jay Foad
2009-06-09 21:37:11 +00:00
parent 7ba520bced
commit e3acf159d9
2 changed files with 9 additions and 24 deletions
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lib/Transforms/IPO/GlobalDCE.cpp
-15
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@@ -47,7 +47,6 @@ namespace {
void GlobalIsNeeded(GlobalValue *GV);
void MarkUsedGlobalsAsNeeded(Constant *C);
bool SafeToDestroyConstant(Constant* C);
bool RemoveUnusedGlobalValue(GlobalValue &GV);
};
}
@@ -211,17 +210,3 @@ bool GlobalDCE::RemoveUnusedGlobalValue(GlobalValue &GV) {
GV.removeDeadConstantUsers();
return GV.use_empty();
}
// SafeToDestroyConstant - It is safe to destroy a constant iff it is only used
// by constants itself. Note that constants cannot be cyclic, so this test is
// pretty easy to implement recursively.
//
bool GlobalDCE::SafeToDestroyConstant(Constant *C) {
for (Value::use_iterator I = C->use_begin(), E = C->use_end(); I != E; ++I)
if (Constant *User = dyn_cast<Constant>(*I)) {
if (!SafeToDestroyConstant(User)) return false;
} else {
return false;
}
return true;
}