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Use smallptrset instead of std::set for efficiency.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45878 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-01-11 19:36:30 +00:00
parent 170b1816b2
commit e027efa218
1 changed files with 3 additions and 2 deletions
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5
lib/Transforms/IPO/ArgumentPromotion.cpp
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@ -282,7 +282,7 @@ bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg, bool isByVal) const {
// Because there could be several/many load instructions, remember which
// blocks we know to be transparent to the load.
std::set<BasicBlock*> TranspBlocks;
SmallPtrSet<BasicBlock*, 16> TranspBlocks;
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
TargetData &TD = getAnalysis<TargetData>();
@ -304,7 +304,8 @@ bool ArgPromotion::isSafeToPromoteArgument(Argument *Arg, bool isByVal) const {
// To do this, we perform a depth first search on the inverse CFG from the
// loading block.
for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
for (idf_ext_iterator<BasicBlock*> I = idf_ext_begin(*PI, TranspBlocks),
for (idf_ext_iterator<BasicBlock*, SmallPtrSet<BasicBlock*, 16> >
I = idf_ext_begin(*PI, TranspBlocks),
E = idf_ext_end(*PI, TranspBlocks); I != E; ++I)
if (AA.canBasicBlockModify(**I, Arg, LoadSize))
return false;