[AliasAnalysis] Second prototype to cache BasicAA / anyAA state.

Summary:
Adding contained caching to AliasAnalysis. BasicAA is currently the only one using it.

AA changes:
- This patch is pulling the caches from BasicAAResults to AAResults, meaning the getModRefInfo call benefits from the IsCapturedCache as well when in "batch mode".
- All AAResultBase implementations add the QueryInfo member to all APIs. AAResults APIs maintain wrapper APIs such that all alias()/getModRefInfo call sites are unchanged.
- AA now provides a BatchAAResults type as a wrapper to AAResults. It keeps the AAResults instance and a QueryInfo instantiated to batch mode. It delegates all work to the AAResults instance with the batched QueryInfo. More API wrappers may be needed in BatchAAResults; only the minimum needed is currently added.

MemorySSA changes:
- All walkers are now templated on the AA used (AliasAnalysis=AAResults or BatchAAResults).
- At build time, we optimize uses; now we create a local walker (lives only as long as OptimizeUses does) using BatchAAResults.
- All Walkers have an internal AA and only use that now, never the AA in MemorySSA. The Walkers receive the AA they will use when built.

- The walker we use for queries after the build is instantiated on AliasAnalysis and is built after building MemorySSA and setting AA.
- All static methods doing walking are now templated on AliasAnalysisType if they are used both during build and after. If used only during build, the method now only takes a BatchAAResults. If used only after build, the method now takes an AliasAnalysis.

Subscribers: sanjoy, arsenm, jvesely, nhaehnle, jlebar, george.burgess.iv, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D59315

llvm-svn: 356783

1 files changed, 4 insertions, 3 deletions

diff --git a/llvm/lib/Analysis/CFLAndersAliasAnalysis.cpp b/llvm/lib/Analysis/CFLAndersAliasAnalysis.cpp
index e73ae5a1b9b..690e514d4f5 100644
--- a/llvm/lib/Analysis/CFLAndersAliasAnalysis.cpp
+++ b/llvm/lib/Analysis/CFLAndersAliasAnalysis.cpp
@@ -875,7 +875,8 @@ AliasResult CFLAndersAAResult::query(const MemoryLocation &LocA,
 }
 
 AliasResult CFLAndersAAResult::alias(const MemoryLocation &LocA,
-                                     const MemoryLocation &LocB) {
+                                     const MemoryLocation &LocB,
+                                     AAQueryInfo &AAQI) {
   if (LocA.Ptr == LocB.Ptr)
     return MustAlias;
 
@@ -885,11 +886,11 @@ AliasResult CFLAndersAAResult::alias(const MemoryLocation &LocA,
   // ConstantExpr, but every query needs to have at least one Value tied to a
   // Function, and neither GlobalValues nor ConstantExprs are.
   if (isa<Constant>(LocA.Ptr) && isa<Constant>(LocB.Ptr))
-    return AAResultBase::alias(LocA, LocB);
+    return AAResultBase::alias(LocA, LocB, AAQI);
 
   AliasResult QueryResult = query(LocA, LocB);
   if (QueryResult == MayAlias)
-    return AAResultBase::alias(LocA, LocB);
+    return AAResultBase::alias(LocA, LocB, AAQI);
 
   return QueryResult;
 }