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

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.

llvm-svn: 132862
This commit is contained in:
Dan Gohman 2011-06-10 22:30:30 +00:00
parent 300f55dcad
commit cc59548793
1 changed files with 7 additions and 1 deletions
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8
llvm/lib/Analysis/BasicAliasAnalysis.cpp
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@ -451,7 +451,13 @@ namespace {
/// BasicAliasAnalysis - This is the primary alias analysis implementation. /// BasicAliasAnalysis - This is the primary alias analysis implementation.
struct BasicAliasAnalysis : public ImmutablePass, public AliasAnalysis { struct BasicAliasAnalysis : public ImmutablePass, public AliasAnalysis {
static char ID; // Class identification, replacement for typeinfo 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()); initializeBasicAliasAnalysisPass(*PassRegistry::getPassRegistry());
} }