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Split DAE::MarkLive into MarkLive and PropagateLiveness.

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llvm-svn: 53600
This commit is contained in:
Matthijs Kooijman 2008-07-15 09:00:17 +00:00
parent 31b7208f7d
commit caa3ed0c99
1 changed files with 6 additions and 0 deletions
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6
lib/Transforms/IPO/DeadArgumentElimination.cpp
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@ -134,6 +134,7 @@ namespace {
const UseVector &MaybeLiveUses);
void MarkLive(const RetOrArg &RA);
void MarkLive(const Function &F);
void PropagateLiveness(const RetOrArg &RA);
bool RemoveDeadStuffFromFunction(Function *F);
bool DeleteDeadVarargs(Function &Fn);
};
@ -545,7 +546,12 @@ void DAE::MarkLive(const RetOrArg &RA) {
return; // We were already marked Live.
DOUT << "DAE - Marking " << RA.getDescription() << " live\n";
PropagateLiveness(RA);
}
/// PropagateLiveness - Given that RA is a live value, propagate it's liveness
/// to any other values it uses (according to Uses).
void DAE::PropagateLiveness(const RetOrArg &RA) {
// We don't use upper_bound (or equal_range) here, because our recursive call
// to ourselves is likely to cause the upper_bound (which is the first value
// not belonging to RA) to become erased and the iterator invalidated.