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Add MemorySSA as loop dependency, disabled by default [NFC].

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Summary:
First step in adding MemorySSA as dependency for loop pass manager.
Adding the dependency under a flag.

New pass manager: MSSA pointer in LoopStandardAnalysisResults can be null.
Legacy and new pass manager: Use cl::opt EnableMSSALoopDependency. Disabled by default.

Reviewers: sanjoy, davide, gberry

Subscribers: mehdi_amini, Prazek, llvm-commits

Differential Revision: https://reviews.llvm.org/D40274

llvm-svn: 318772
This commit is contained in:
Alina Sbirlea 2017-11-21 15:45:46 +00:00
parent 33706d76ee
commit 77a10244b2
7 changed files with 43 additions and 11 deletions
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5
include/llvm/Analysis/LoopAnalysisManager.h
View File

@ -37,6 +37,7 @@
#include "llvm/Analysis/BasicAliasAnalysis.h"
#include "llvm/Analysis/GlobalsModRef.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/MemorySSA.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
@ -58,8 +59,12 @@ struct LoopStandardAnalysisResults {
ScalarEvolution &SE;
TargetLibraryInfo &TLI;
TargetTransformInfo &TTI;
MemorySSA *MSSA;
};
/// Enables memory ssa as a dependency for loop passes.
extern cl::opt<bool> EnableMSSALoopDependency;
/// Extern template declaration for the analysis set for this IR unit.
extern template class AllAnalysesOn<Loop>;

8
include/llvm/Transforms/Scalar/LoopPassManager.h
View File

@ -285,13 +285,17 @@ public:
return PA;
// Get the analysis results needed by loop passes.
MemorySSA *MSSA = EnableMSSALoopDependency
? (&AM.getResult<MemorySSAAnalysis>(F).getMSSA())
: nullptr;
LoopStandardAnalysisResults LAR = {AM.getResult<AAManager>(F),
AM.getResult<AssumptionAnalysis>(F),
AM.getResult<DominatorTreeAnalysis>(F),
AM.getResult<LoopAnalysis>(F),
AM.getResult<ScalarEvolutionAnalysis>(F),
AM.getResult<TargetLibraryAnalysis>(F),
AM.getResult<TargetIRAnalysis>(F)};
AM.getResult<TargetIRAnalysis>(F),
MSSA};
// Setup the loop analysis manager from its proxy. It is important that
// this is only done when there are loops to process and we have built the
@ -359,6 +363,8 @@ public:
PA.preserve<DominatorTreeAnalysis>();
PA.preserve<LoopAnalysis>();
PA.preserve<ScalarEvolutionAnalysis>();
// FIXME: Uncomment this when all loop passes preserve MemorySSA
// PA.preserve<MemorySSAAnalysis>();
// FIXME: What we really want to do here is preserve an AA category, but
// that concept doesn't exist yet.
PA.preserve<AAManager>();

18
lib/Analysis/LoopAnalysisManager.cpp
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@ -11,15 +11,21 @@
#include "llvm/Analysis/BasicAliasAnalysis.h"
#include "llvm/Analysis/GlobalsModRef.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/MemorySSA.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h"
#include "llvm/IR/Dominators.h"
using namespace llvm;
namespace llvm {
/// Enables memory ssa as a dependency for loop passes in legacy pass manager.
cl::opt<bool> EnableMSSALoopDependency(
"enable-mssa-loop-dependency", cl::Hidden, cl::init(false),
cl::desc("Enable MemorySSA dependency for loop pass manager"));
// Explicit template instantiations and specialization defininitions for core
// template typedefs.
namespace llvm {
template class AllAnalysesOn<Loop>;
template class AnalysisManager<Loop, LoopStandardAnalysisResults &>;
template class InnerAnalysisManagerProxy<LoopAnalysisManager, Function>;
@ -45,12 +51,16 @@ bool LoopAnalysisManagerFunctionProxy::Result::invalidate(
// loop analyses declare any dependencies on these and use the more general
// invalidation logic below to act on that.
auto PAC = PA.getChecker<LoopAnalysisManagerFunctionProxy>();
bool invalidateMemorySSAAnalysis = false;
if (EnableMSSALoopDependency)
invalidateMemorySSAAnalysis = Inv.invalidate<MemorySSAAnalysis>(F, PA);
if (!(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>()) ||
Inv.invalidate<AAManager>(F, PA) ||
Inv.invalidate<AssumptionAnalysis>(F, PA) ||
Inv.invalidate<DominatorTreeAnalysis>(F, PA) ||
Inv.invalidate<LoopAnalysis>(F, PA) ||
Inv.invalidate<ScalarEvolutionAnalysis>(F, PA)) {
Inv.invalidate<ScalarEvolutionAnalysis>(F, PA) ||
invalidateMemorySSAAnalysis) {
// Note that the LoopInfo may be stale at this point, however the loop
// objects themselves remain the only viable keys that could be in the
// analysis manager's cache. So we just walk the keys and forcibly clear
@ -137,7 +147,9 @@ PreservedAnalyses llvm::getLoopPassPreservedAnalyses() {
PA.preserve<LoopAnalysis>();
PA.preserve<LoopAnalysisManagerFunctionProxy>();
PA.preserve<ScalarEvolutionAnalysis>();
// TODO: What we really want to do here is preserve an AA category, but that
// FIXME: Uncomment this when all loop passes preserve MemorySSA
// PA.preserve<MemorySSAAnalysis>();
// FIXME: What we really want to do here is preserve an AA category, but that
// concept doesn't exist yet.
PA.preserve<AAManager>();
PA.preserve<BasicAA>();

16
lib/Transforms/Scalar/LICM.cpp
View File

@ -42,6 +42,7 @@
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/LoopPass.h"
#include "llvm/Analysis/MemoryBuiltins.h"
#include "llvm/Analysis/MemorySSA.h"
#include "llvm/Analysis/OptimizationRemarkEmitter.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h"
@ -114,7 +115,7 @@ CloneInstructionInExitBlock(Instruction &I, BasicBlock &ExitBlock, PHINode &PN,
namespace {
struct LoopInvariantCodeMotion {
bool runOnLoop(Loop *L, AliasAnalysis *AA, LoopInfo *LI, DominatorTree *DT,
TargetLibraryInfo *TLI, ScalarEvolution *SE,
TargetLibraryInfo *TLI, ScalarEvolution *SE, MemorySSA *MSSA,
OptimizationRemarkEmitter *ORE, bool DeleteAST);
DenseMap<Loop *, AliasSetTracker *> &getLoopToAliasSetMap() {
@ -146,6 +147,9 @@ struct LegacyLICMPass : public LoopPass {
}
auto *SE = getAnalysisIfAvailable<ScalarEvolutionWrapperPass>();
MemorySSA *MSSA = EnableMSSALoopDependency
? (&getAnalysis<MemorySSAWrapperPass>().getMSSA())
: nullptr;
// For the old PM, we can't use OptimizationRemarkEmitter as an analysis
// pass. Function analyses need to be preserved across loop transformations
// but ORE cannot be preserved (see comment before the pass definition).
@ -155,7 +159,7 @@ struct LegacyLICMPass : public LoopPass {
&getAnalysis<LoopInfoWrapperPass>().getLoopInfo(),
&getAnalysis<DominatorTreeWrapperPass>().getDomTree(),
&getAnalysis<TargetLibraryInfoWrapperPass>().getTLI(),
SE ? &SE->getSE() : nullptr, &ORE, false);
SE ? &SE->getSE() : nullptr, MSSA, &ORE, false);
}
/// This transformation requires natural loop information & requires that
@ -164,6 +168,8 @@ struct LegacyLICMPass : public LoopPass {
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesCFG();
AU.addRequired<TargetLibraryInfoWrapperPass>();
if (EnableMSSALoopDependency)
AU.addRequired<MemorySSAWrapperPass>();
getLoopAnalysisUsage(AU);
}
@ -204,7 +210,8 @@ PreservedAnalyses LICMPass::run(Loop &L, LoopAnalysisManager &AM,
"cached at a higher level");
LoopInvariantCodeMotion LICM;
if (!LICM.runOnLoop(&L, &AR.AA, &AR.LI, &AR.DT, &AR.TLI, &AR.SE, ORE, true))
if (!LICM.runOnLoop(&L, &AR.AA, &AR.LI, &AR.DT, &AR.TLI, &AR.SE, AR.MSSA, ORE,
true))
return PreservedAnalyses::all();
auto PA = getLoopPassPreservedAnalyses();
@ -217,6 +224,7 @@ INITIALIZE_PASS_BEGIN(LegacyLICMPass, "licm", "Loop Invariant Code Motion",
false, false)
INITIALIZE_PASS_DEPENDENCY(LoopPass)
INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
INITIALIZE_PASS_DEPENDENCY(MemorySSAWrapperPass)
INITIALIZE_PASS_END(LegacyLICMPass, "licm", "Loop Invariant Code Motion", false,
false)
@ -231,7 +239,7 @@ Pass *llvm::createLICMPass() { return new LegacyLICMPass(); }
bool LoopInvariantCodeMotion::runOnLoop(Loop *L, AliasAnalysis *AA,
LoopInfo *LI, DominatorTree *DT,
TargetLibraryInfo *TLI,
ScalarEvolution *SE,
ScalarEvolution *SE, MemorySSA *MSSA,
OptimizationRemarkEmitter *ORE,
bool DeleteAST) {
bool Changed = false;

2
lib/Transforms/Scalar/LoopDistribute.cpp
View File

@ -995,7 +995,7 @@ PreservedAnalyses LoopDistributePass::run(Function &F,
auto &LAM = AM.getResult<LoopAnalysisManagerFunctionProxy>(F).getManager();
std::function<const LoopAccessInfo &(Loop &)> GetLAA =
[&](Loop &L) -> const LoopAccessInfo & {
LoopStandardAnalysisResults AR = {AA, AC, DT, LI, SE, TLI, TTI};
LoopStandardAnalysisResults AR = {AA, AC, DT, LI, SE, TLI, TTI, nullptr};
return LAM.getResult<LoopAccessAnalysis>(L, AR);
};

3
lib/Transforms/Scalar/LoopLoadElimination.cpp
View File

@ -666,7 +666,8 @@ PreservedAnalyses LoopLoadEliminationPass::run(Function &F,
auto &LAM = AM.getResult<LoopAnalysisManagerFunctionProxy>(F).getManager();
bool Changed = eliminateLoadsAcrossLoops(
F, LI, DT, [&](Loop &L) -> const LoopAccessInfo & {
LoopStandardAnalysisResults AR = {AA, AC, DT, LI, SE, TLI, TTI};
LoopStandardAnalysisResults AR = {AA, AC, DT, LI,
SE, TLI, TTI, nullptr};
return LAM.getResult<LoopAccessAnalysis>(L, AR);
});

2
lib/Transforms/Vectorize/LoopVectorize.cpp
View File

@ -9027,7 +9027,7 @@ PreservedAnalyses LoopVectorizePass::run(Function &F,
auto &LAM = AM.getResult<LoopAnalysisManagerFunctionProxy>(F).getManager();
std::function<const LoopAccessInfo &(Loop &)> GetLAA =
[&](Loop &L) -> const LoopAccessInfo & {
LoopStandardAnalysisResults AR = {AA, AC, DT, LI, SE, TLI, TTI};
LoopStandardAnalysisResults AR = {AA, AC, DT, LI, SE, TLI, TTI, nullptr};
return LAM.getResult<LoopAccessAnalysis>(L, AR);
};
bool Changed =