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Initialize BasicAA's AliasCache to set it to use fewer buckets by

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default, since it usually has very few elements. This speeds up
alias queries in many cases, because AliasCache.clear() doesn't
have to visit as many buckets.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132862 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2011-06-10 22:30:30 +00:00
parent a1f21e69c4
commit 9a09ca348f
1 changed files with 7 additions and 1 deletions
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8
lib/Analysis/BasicAliasAnalysis.cpp
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@ -451,7 +451,13 @@ namespace {
/// BasicAliasAnalysis - This is the primary alias analysis implementation.
struct BasicAliasAnalysis : public ImmutablePass, public AliasAnalysis {
static char ID; // Class identification, replacement for typeinfo
BasicAliasAnalysis() : ImmutablePass(ID) {
BasicAliasAnalysis() : ImmutablePass(ID),
// AliasCache rarely has more than 1 or 2 elements,
// so start it off fairly small so that clear()
// doesn't have to tromp through 64 (the default)
// elements on each alias query. This really wants
// something like a SmallDenseMap.
AliasCache(8) {
initializeBasicAliasAnalysisPass(*PassRegistry::getPassRegistry());
}