From d06034d20a7eeb4b43e27e618c9ba0b076e18b39 Mon Sep 17 00:00:00 2001
From: Chandler Carruth <chandlerc@gmail.com>
Date: Wed, 12 Aug 2015 17:47:44 +0000
Subject: [PATCH] [PM/AA] Have memdep explicitly get and use TargetLibraryInfo
 rather than relying on sneaking it out of its AliasAnalysis.

This abuse of AA (to shuffle TLI around rather than explicitly depending
on it) is going away with my refactor of AA.

llvm-svn: 244778
---
 llvm/include/llvm/Analysis/MemoryDependenceAnalysis.h |  1 +
 llvm/lib/Analysis/MemoryDependenceAnalysis.cpp        | 12 +++++++-----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/llvm/include/llvm/Analysis/MemoryDependenceAnalysis.h b/llvm/include/llvm/Analysis/MemoryDependenceAnalysis.h
index 5118980..4d3ef5d 100644
--- a/llvm/include/llvm/Analysis/MemoryDependenceAnalysis.h
+++ b/llvm/include/llvm/Analysis/MemoryDependenceAnalysis.h
@@ -326,6 +326,7 @@ namespace llvm {
     AliasAnalysis *AA;
     DominatorTree *DT;
     AssumptionCache *AC;
+    const TargetLibraryInfo *TLI;
     PredIteratorCache PredCache;
 
   public:
diff --git a/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp b/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp
index 54ac1b6..ff78f6e 100644
--- a/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp
+++ b/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp
@@ -24,6 +24,7 @@
 #include "llvm/Analysis/PHITransAddr.h"
 #include "llvm/Analysis/OrderedBasicBlock.h"
 #include "llvm/Analysis/ValueTracking.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/Dominators.h"
 #include "llvm/IR/Function.h"
@@ -93,6 +94,7 @@ void MemoryDependenceAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.setPreservesAll();
   AU.addRequired<AssumptionCacheTracker>();
   AU.addRequiredTransitive<AliasAnalysis>();
+  AU.addRequiredTransitive<TargetLibraryInfoWrapperPass>();
 }
 
 bool MemoryDependenceAnalysis::runOnFunction(Function &F) {
@@ -101,6 +103,7 @@ bool MemoryDependenceAnalysis::runOnFunction(Function &F) {
   DominatorTreeWrapperPass *DTWP =
       getAnalysisIfAvailable<DominatorTreeWrapperPass>();
   DT = DTWP ? &DTWP->getDomTree() : nullptr;
+  TLI = &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
   return false;
 }
 
@@ -124,7 +127,7 @@ static void RemoveFromReverseMap(DenseMap<Instruction*,
 /// Return a ModRefInfo value describing the general behavior of the
 /// instruction.
 static ModRefInfo GetLocation(const Instruction *Inst, MemoryLocation &Loc,
-                              AliasAnalysis *AA) {
+                              const TargetLibraryInfo &TLI) {
   if (const LoadInst *LI = dyn_cast<LoadInst>(Inst)) {
     if (LI->isUnordered()) {
       Loc = MemoryLocation::get(LI);
@@ -156,7 +159,7 @@ static ModRefInfo GetLocation(const Instruction *Inst, MemoryLocation &Loc,
     return MRI_ModRef;
   }
 
-  if (const CallInst *CI = isFreeCall(Inst, AA->getTargetLibraryInfo())) {
+  if (const CallInst *CI = isFreeCall(Inst, &TLI)) {
     // calls to free() deallocate the entire structure
     Loc = MemoryLocation(CI->getArgOperand(0));
     return MRI_Mod;
@@ -216,7 +219,7 @@ getCallSiteDependencyFrom(CallSite CS, bool isReadOnlyCall,
 
     // If this inst is a memory op, get the pointer it accessed
     MemoryLocation Loc;
-    ModRefInfo MR = GetLocation(Inst, Loc, AA);
+    ModRefInfo MR = GetLocation(Inst, Loc, *TLI);
     if (Loc.Ptr) {
       // A simple instruction.
       if (AA->getModRefInfo(CS, Loc) != MRI_NoModRef)
@@ -605,7 +608,6 @@ MemDepResult MemoryDependenceAnalysis::getPointerDependencyFrom(
     // a subsequent bitcast of the malloc call result.  There can be stores to
     // the malloced memory between the malloc call and its bitcast uses, and we
     // need to continue scanning until the malloc call.
-    const TargetLibraryInfo *TLI = AA->getTargetLibraryInfo();
     if (isa<AllocaInst>(Inst) || isNoAliasFn(Inst, TLI)) {
       const Value *AccessPtr = GetUnderlyingObject(MemLoc.Ptr, DL);
 
@@ -688,7 +690,7 @@ MemDepResult MemoryDependenceAnalysis::getDependency(Instruction *QueryInst) {
       LocalCache = MemDepResult::getNonFuncLocal();
   } else {
     MemoryLocation MemLoc;
-    ModRefInfo MR = GetLocation(QueryInst, MemLoc, AA);
+    ModRefInfo MR = GetLocation(QueryInst, MemLoc, *TLI);
     if (MemLoc.Ptr) {
       // If we can do a pointer scan, make it happen.
       bool isLoad = !(MR & MRI_Mod);
-- 
2.7.4