commit 83505347724a3eeb42f66a0b58fb8ff5c4c9ea4c
author Bjorn Steinbrink <bsteinbr@gmail.com> Fri Jul 10 06:55:49 2015 +0000
committer Bjorn Steinbrink <bsteinbr@gmail.com> Fri Jul 10 06:55:49 2015 +0000
tree ab1ca85ee388a74a05be1c3162c935a4a5b17227
parent a91fd0998fcf39b8eb1920f358671cbe82b0ef1c

[InstCombine] Employ AliasAnalysis in FindAvailableLoadedValue

llvm-svn: 241887

llvm/lib/Transforms/InstCombine/InstructionCombining.cpp

diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
index 2a81689..ea4089b 100644
--- a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -2972,8 +2972,9 @@
 
 static bool
 combineInstructionsOverFunction(Function &F, InstCombineWorklist &Worklist,
-                                AssumptionCache &AC, TargetLibraryInfo &TLI,
-                                DominatorTree &DT, LoopInfo *LI = nullptr) {
+                                AliasAnalysis *AA, AssumptionCache &AC,
+                                TargetLibraryInfo &TLI, DominatorTree &DT,
+                                LoopInfo *LI = nullptr) {
   // Minimizing size?
   bool MinimizeSize = F.hasFnAttribute(Attribute::MinSize);
   auto &DL = F.getParent()->getDataLayout();
@@ -2998,7 +2999,8 @@
     if (prepareICWorklistFromFunction(F, DL, &TLI, Worklist))
       Changed = true;
 
-    InstCombiner IC(Worklist, &Builder, MinimizeSize, &AC, &TLI, &DT, DL, LI);
+    InstCombiner IC(Worklist, &Builder, MinimizeSize,
+                    AA, &AC, &TLI, &DT, DL, LI);
     if (IC.run())
       Changed = true;
 
@@ -3017,7 +3019,8 @@
 
   auto *LI = AM->getCachedResult<LoopAnalysis>(F);
 
-  if (!combineInstructionsOverFunction(F, Worklist, AC, TLI, DT, LI))
+  // FIXME: The AliasAnalysis is not yet supported in the new pass manager
+  if (!combineInstructionsOverFunction(F, Worklist, nullptr, AC, TLI, DT, LI))
     // No changes, all analyses are preserved.
     return PreservedAnalyses::all();
 
@@ -3050,6 +3053,7 @@
 
 void InstructionCombiningPass::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.setPreservesCFG();
+  AU.addRequired<AliasAnalysis>();
   AU.addRequired<AssumptionCacheTracker>();
   AU.addRequired<TargetLibraryInfoWrapperPass>();
   AU.addRequired<DominatorTreeWrapperPass>();
@@ -3061,6 +3065,7 @@
     return false;
 
   // Required analyses.
+  auto AA = &getAnalysis<AliasAnalysis>();
   auto &AC = getAnalysis<AssumptionCacheTracker>().getAssumptionCache(F);
   auto &TLI = getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
   auto &DT = getAnalysis<DominatorTreeWrapperPass>().getDomTree();
@@ -3069,7 +3074,7 @@
   auto *LIWP = getAnalysisIfAvailable<LoopInfoWrapperPass>();
   auto *LI = LIWP ? &LIWP->getLoopInfo() : nullptr;
 
-  return combineInstructionsOverFunction(F, Worklist, AC, TLI, DT, LI);
+  return combineInstructionsOverFunction(F, Worklist, AA, AC, TLI, DT, LI);
 }
 
 char InstructionCombiningPass::ID = 0;
@@ -3078,6 +3083,7 @@
 INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
 INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
 INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
+INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
 INITIALIZE_PASS_END(InstructionCombiningPass, "instcombine",
                     "Combine redundant instructions", false, false)