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[unroll] Use a small set to de-duplicate operands prior to putting them 

into the worklist. This avoids allocating lots of worklist memory for
them when there are large numbers of repeated operands.

llvm-svn: 229052
This commit is contained in:
Chandler Carruth 2015-02-13 03:48:38 +00:00
parent 8e19879f5a
commit 8c86375a10
1 changed files with 12 additions and 2 deletions
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10
llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
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@ -503,6 +503,12 @@ public:
SmallVector<Instruction *, 8> Worklist;
SmallPtrSet<Instruction *, 16> DeadInstructions;
// We keep a very small set of operands that we use to de-duplicate things
// when inserting into the worklist. This lets us handle duplicates within
// a single instruction's operands without buring lots of memory on the
// worklist.
SmallPtrSet<Instruction *, 4> OperandSet;
// Start by initializing worklist with simplified instructions.
for (auto &FoldedKeyValue : SimplifiedValues)
if (auto *FoldedInst = dyn_cast<Instruction>(FoldedKeyValue.first)) {
@ -510,8 +516,10 @@ public:
// Add each instruction operand of this dead instruction to the
// worklist.
OperandSet.clear();
for (auto *Op : FoldedInst->operand_values())
if (auto *OpI = dyn_cast<Instruction>(Op))
if (OperandSet.insert(OpI).second)
Worklist.push_back(OpI);
}
@ -537,8 +545,10 @@ public:
if (AllUsersFolded) {
NumberOfOptimizedInstructions += TTI.getUserCost(I);
DeadInstructions.insert(I);
OperandSet.clear();
for (auto *Op : I->operand_values())
if (auto *OpI = dyn_cast<Instruction>(Op))
if (OperandSet.insert(OpI).second)
Worklist.push_back(OpI);
}
}