Add the CompactionTableIsEmpty function so that we can determine if a

CompactionTable really needs to be emitted. This is not a straight forward
computation, hence the need for a member function here.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16062 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2004-08-26 22:32:00 +00:00
parent 22a2f6d5b0
commit 07ea1917d0
2 changed files with 29 additions and 0 deletions

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@ -622,6 +622,32 @@ void SlotCalculator::pruneCompactionTable() {
}
}
/// Determine if the compaction table is actually empty. Because the
/// compaction table always includes the primitive type planes, we
/// can't just check getCompactionTable().size() because it will never
/// be zero. Furthermore, the ModuleLevel factors into whether a given
/// plane is empty or not. This function does the necessary computation
/// to determine if its actually empty.
bool SlotCalculator::CompactionTableIsEmpty() const {
// Check a degenerate case, just in case.
if (CompactionTable.size() == 0) return true;
// Check each plane
for (unsigned i = 0, e = CompactionTable.size(); i < e; ++i) {
// If the plane is not empty
if (!CompactionTable[i].empty()) {
// If the module level is non-zero then at least the
// first element of the plane is valid and therefore not empty.
unsigned End = getModuleLevel(i);
if (End != 0)
return false;
}
}
// All the compaction table planes are empty so the table is
// considered empty too.
return true;
}
int SlotCalculator::getSlot(const Value *V) const {
// If there is a CompactionTable active...
if (!CompactionNodeMap.empty()) {

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@ -138,6 +138,9 @@ public:
const TypeList& getCompactionTypes() const { return CompactionTypes; }
/// @brief Determine if the compaction table (not types) is empty
bool CompactionTableIsEmpty() const;
private:
// getOrCreateSlot - Values can be crammed into here at will... if
// they haven't been inserted already, they get inserted, otherwise