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Properly implement copying of a global, fixing the 255.vortex & povray

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failures from last night.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18832 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-12-12 19:34:41 +00:00
parent fb851ab281
commit 38c2556d0c
1 changed files with 25 additions and 2 deletions
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25
lib/Transforms/IPO/GlobalOpt.cpp
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@ -842,11 +842,34 @@ static void ShrinkGlobalToBoolean(GlobalVariable *GV, Constant *OtherVal) {
// Change the store into a boolean store.
bool StoringOther = SI->getOperand(0) == OtherVal;
// Only do this if we weren't storing a loaded value.
Value *StoreVal;
if (StoringOther || SI->getOperand(0) == InitVal)
new StoreInst(ConstantBool::get(StoringOther), NewGV, SI);
StoreVal = ConstantBool::get(StoringOther);
else {
// Otherwise, we are storing a previously loaded copy. To do this,
// change the copy from copying the original value to just copying the
// bool.
Instruction *StoredVal = cast<Instruction>(SI->getOperand(0));
// If we're already replaced the input, StoredVal will be a cast or
// select instruction. If not, it will be a load of the original
// global.
if (LoadInst *LI = dyn_cast<LoadInst>(StoredVal)) {
assert(LI->getOperand(0) == GV && "Not a copy!");
// Insert a new load, to preserve the saved value.
StoreVal = new LoadInst(NewGV, LI->getName()+".b", LI);
} else {
assert((isa<CastInst>(StoredVal) || isa<SelectInst>(StoredVal)) &&
"This is not a form that we understand!");
StoreVal = StoredVal->getOperand(0);
assert(isa<LoadInst>(StoreVal) && "Not a load of NewGV!");
}
}
new StoreInst(StoreVal, NewGV, SI);
} else if (!UI->use_empty()) {
// Change the load into a load of bool then a select.
LoadInst *LI = cast<LoadInst>(UI);
std::string Name = LI->getName(); LI->setName("");
LoadInst *NLI = new LoadInst(NewGV, Name+".b", LI);
Value *NSI;