[llvm-commits] CVS: llvm/lib/Transforms/Utils/LCSSA.cpp
Chris Lattner
sabre at nondot.org
Sat Apr 14 15:10:39 PDT 2007
Changes in directory llvm/lib/Transforms/Utils:
LCSSA.cpp updated: 1.35 -> 1.36
---
Log message:
avoid copying sets and vectors around.
---
Diffs of the changes: (+6 -7)
LCSSA.cpp | 13 ++++++-------
1 files changed, 6 insertions(+), 7 deletions(-)
Index: llvm/lib/Transforms/Utils/LCSSA.cpp
diff -u llvm/lib/Transforms/Utils/LCSSA.cpp:1.35 llvm/lib/Transforms/Utils/LCSSA.cpp:1.36
--- llvm/lib/Transforms/Utils/LCSSA.cpp:1.35 Mon Feb 5 17:32:05 2007
+++ llvm/lib/Transforms/Utils/LCSSA.cpp Sat Apr 14 17:10:17 2007
@@ -69,7 +69,8 @@
AU.addRequired<DominatorTree>();
}
private:
- SetVector<Instruction*> getLoopValuesUsedOutsideLoop(Loop *L);
+ void getLoopValuesUsedOutsideLoop(Loop *L,
+ SetVector<Instruction*> &AffectedValues);
Value *GetValueForBlock(DominatorTree::Node *BB, Instruction *OrigInst,
std::map<DominatorTree::Node*, Value*> &Phis);
@@ -110,7 +111,8 @@
LoopBlocks.insert(LoopBlocks.end(), L->block_begin(), L->block_end());
std::sort(LoopBlocks.begin(), LoopBlocks.end());
- SetVector<Instruction*> AffectedValues = getLoopValuesUsedOutsideLoop(L);
+ SetVector<Instruction*> AffectedValues;
+ getLoopValuesUsedOutsideLoop(L, AffectedValues);
// If no values are affected, we can save a lot of work, since we know that
// nothing will be changed.
@@ -196,14 +198,12 @@
/// getLoopValuesUsedOutsideLoop - Return any values defined in the loop that
/// are used by instructions outside of it.
-SetVector<Instruction*> LCSSA::getLoopValuesUsedOutsideLoop(Loop *L) {
-
+void LCSSA::getLoopValuesUsedOutsideLoop(Loop *L,
+ SetVector<Instruction*> &AffectedValues) {
// FIXME: For large loops, we may be able to avoid a lot of use-scanning
// by using dominance information. In particular, if a block does not
// dominate any of the loop exits, then none of the values defined in the
// block could be used outside the loop.
-
- SetVector<Instruction*> AffectedValues;
for (Loop::block_iterator BB = L->block_begin(), E = L->block_end();
BB != E; ++BB) {
for (BasicBlock::iterator I = (*BB)->begin(), E = (*BB)->end(); I != E; ++I)
@@ -221,7 +221,6 @@
}
}
}
- return AffectedValues;
}
/// GetValueForBlock - Get the value to use within the specified basic block.
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