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[AA] Make BasicAA just require domtree.

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This doesn't change how many times we construct domtrees in the normal
pipeline, and it removes fragility and instability where basic-aa may
not be run in time to see domtrees because they happen to be constructed
afterward.

This isn't quite as clean as the change to memdep because there is
a mode where basic-aa specifically runs without domtrees -- in the
hacking version used by function-attrs with the legacy pass manager.

llvm-svn: 263234
This commit is contained in:
Chandler Carruth 2016-03-11 13:53:18 +00:00
parent a2bec20b29
commit 0997ba3d13
1 changed files with 5 additions and 4 deletions
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9
lib/Analysis/BasicAliasAnalysis.cpp
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@ -1612,7 +1612,7 @@ BasicAAResult BasicAA::run(Function &F, AnalysisManager<Function> &AM) {
return BasicAAResult(F.getParent()->getDataLayout(),
AM.getResult<TargetLibraryAnalysis>(F),
AM.getResult<AssumptionAnalysis>(F),
AM.getCachedResult<DominatorTreeAnalysis>(F),
&AM.getResult<DominatorTreeAnalysis>(F),
AM.getCachedResult<LoopAnalysis>(F));
}
@ -1626,6 +1626,7 @@ void BasicAAWrapperPass::anchor() {}
INITIALIZE_PASS_BEGIN(BasicAAWrapperPass, "basicaa",
"Basic Alias Analysis (stateless AA impl)", true, true)
INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
INITIALIZE_PASS_END(BasicAAWrapperPass, "basicaa",
"Basic Alias Analysis (stateless AA impl)", true, true)
@ -1637,12 +1638,11 @@ FunctionPass *llvm::createBasicAAWrapperPass() {
bool BasicAAWrapperPass::runOnFunction(Function &F) {
auto &ACT = getAnalysis<AssumptionCacheTracker>();
auto &TLIWP = getAnalysis<TargetLibraryInfoWrapperPass>();
auto *DTWP = getAnalysisIfAvailable<DominatorTreeWrapperPass>();
auto &DTWP = getAnalysis<DominatorTreeWrapperPass>();
auto *LIWP = getAnalysisIfAvailable<LoopInfoWrapperPass>();
Result.reset(new BasicAAResult(F.getParent()->getDataLayout(), TLIWP.getTLI(),
ACT.getAssumptionCache(F),
DTWP ? &DTWP->getDomTree() : nullptr,
ACT.getAssumptionCache(F), &DTWP.getDomTree(),
LIWP ? &LIWP->getLoopInfo() : nullptr));
return false;
@ -1651,6 +1651,7 @@ bool BasicAAWrapperPass::runOnFunction(Function &F) {
void BasicAAWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<AssumptionCacheTracker>();
AU.addRequired<DominatorTreeWrapperPass>();
AU.addRequired<TargetLibraryInfoWrapperPass>();
}