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Stop reallocating SunkAddrs for each basic block. When we move to an instruction

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worklist, the key will need to become std::pair<BasicBlock*, Value*>.

llvm-svn: 122932
This commit is contained in:
Cameron Zwarich 2011-01-06 00:42:50 +00:00
parent ba8ae674d7
commit eeea9f7113
1 changed files with 10 additions and 4 deletions
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14
lib/Transforms/Scalar/CodeGenPrepare.cpp
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@ -71,6 +71,12 @@ namespace {
/// BackEdges - Keep a set of all the loop back edges.
///
SmallSet<std::pair<const BasicBlock*, const BasicBlock*>, 8> BackEdges;
// Keeps track of non-local addresses that have been sunk into a block. This
// allows us to avoid inserting duplicate code for blocks with multiple
// load/stores of the same address.
DenseMap<Value*, Value*> SunkAddrs;
public:
static char ID; // Pass identification, replacement for typeid
explicit CodeGenPrepare(const TargetLowering *tli = 0)
@ -141,6 +147,9 @@ bool CodeGenPrepare::runOnFunction(Function &F) {
MadeChange |= OptimizeBlock(*BB);
EverMadeChange |= MadeChange;
}
SunkAddrs.clear();
return EverMadeChange;
}
@ -968,10 +977,7 @@ bool CodeGenPrepare::OptimizeBlock(BasicBlock &BB) {
}
}
// Keep track of non-local addresses that have been sunk into this block.
// This allows us to avoid inserting duplicate code for blocks with multiple
// load/stores of the same address.
DenseMap<Value*, Value*> SunkAddrs;
SunkAddrs.clear();
for (BasicBlock::iterator BBI = BB.begin(), E = BB.end(); BBI != E; ) {
Instruction *I = BBI++;