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Fix a bad case in gzip where we put lots of things in registers across the

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loop, because a IV-dependent value was used outside of the loop and didn't
have immediate-folding capability


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22798 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-08-16 00:38:11 +00:00
parent ff2006aa74
commit 80b32b3aab
1 changed files with 17 additions and 9 deletions
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26
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -737,15 +737,23 @@ void LoopStrengthReduce::StrengthReduceStridedIVUsers(const SCEVHandle &Stride,
// fields of the BasedUsers. We do this so that it increases the commonality
// of the remaining uses.
for (unsigned i = 0, e = UsersToProcess.size(); i != e; ++i) {
// Addressing modes can be folded into loads and stores. Be careful that
// the store is through the expression, not of the expression though.
bool isAddress = isa<LoadInst>(UsersToProcess[i].Inst);
if (StoreInst *SI = dyn_cast<StoreInst>(UsersToProcess[i].Inst))
if (SI->getOperand(1) == UsersToProcess[i].OperandValToReplace)
isAddress = true;
MoveImmediateValues(UsersToProcess[i].Base, UsersToProcess[i].Imm,
isAddress, L);
// If the user is not in the current loop, this means it is using the exit
// value of the IV. Do not put anything in the base, make sure it's all in
// the immediate field to allow as much factoring as possible.
if (!L->contains(UsersToProcess[i].Inst->getParent())) {
std::swap(UsersToProcess[i].Base, UsersToProcess[i].Imm);
} else {
// Addressing modes can be folded into loads and stores. Be careful that
// the store is through the expression, not of the expression though.
bool isAddress = isa<LoadInst>(UsersToProcess[i].Inst);
if (StoreInst *SI = dyn_cast<StoreInst>(UsersToProcess[i].Inst))
if (SI->getOperand(1) == UsersToProcess[i].OperandValToReplace)
isAddress = true;
MoveImmediateValues(UsersToProcess[i].Base, UsersToProcess[i].Imm,
isAddress, L);
}
}
// Now that we know what we need to do, insert the PHI node itself.