[InjectTLIMappings] Preserve GLobalsAAWrapperPass.

[fhahn]

Summary

InjectTLIMappings runs before LoopVectorize but is not marked as
preserving GlobalsAA. This means that GlobalsAA is not available in
LoopVectorize, causing some loops to not be vectorized due to failing to
deduce no-alias for some accesses.

This fixes a few 5-10% regressions on SPEC2000/SPEC2006 with LTO & PGO.

[fpetrogalli]

Hi @fhahn ,

it seems there is some overlap with this patch? https://reviews.llvm.org/D82063

Francesco

[fhahn]

In D82195#2103780, @fpetrogalli wrote:

it seems there is some overlap with this patch? https://reviews.llvm.org/D82063

Oh right, that's great! What a coincidence! I'll abandon this one then.

llvm/lib/Transforms/Utils/InjectTLIMappings.cpp

 //===- InjectTLIMAppings.cpp - TLI to VFABI attribute injection  ----------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // Populates the VFABI attribute with the scalar-to-vector mappings
 // from the TargetLibraryInfo.
 //
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Transforms/Utils/InjectTLIMappings.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/Analysis/DemandedBits.h"
+#include "llvm/Analysis/GlobalsModRef.h"
 #include "llvm/Analysis/OptimizationRemarkEmitter.h"
 #include "llvm/Analysis/VectorUtils.h"
 #include "llvm/IR/InstIterator.h"
 #include "llvm/IR/IntrinsicInst.h"
 #include "llvm/Transforms/Utils.h"
 #include "llvm/Transforms/Utils/ModuleUtils.h"
 
 using namespace llvm;
void InjectTLIMappingsLegacy::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.setPreservesCFG();
   AU.addRequired<TargetLibraryInfoWrapperPass>();
   AU.addPreserved<TargetLibraryInfoWrapperPass>();
   AU.addPreserved<ScalarEvolutionWrapperPass>();
   AU.addPreserved<AAResultsWrapperPass>();
   AU.addPreserved<LoopAccessLegacyAnalysis>();
   AU.addPreserved<DemandedBitsWrapperPass>();
   AU.addPreserved<OptimizationRemarkEmitterWrapperPass>();
+  AU.addPreserved<GlobalsAAWrapperPass>();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Legacy Pass manager initialization
 ////////////////////////////////////////////////////////////////////////////////
 char InjectTLIMappingsLegacy::ID = 0;
 
 INITIALIZE_PASS_BEGIN(InjectTLIMappingsLegacy, DEBUG_TYPE,
                       "Inject TLI Mappings", false, false)
 INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
 INITIALIZE_PASS_END(InjectTLIMappingsLegacy, DEBUG_TYPE, "Inject TLI Mappings",
                     false, false)
 
 FunctionPass *llvm::createInjectTLIMappingsLegacyPass() {
   return new InjectTLIMappingsLegacy();
 }