[PM] Port LoopIdiomRecognize Pass to new PM

Summary: Port LoopIdiomRecognize Pass to new PM

Reviewers: davidxl

Subscribers: davide, sanjoy, mzolotukhin, llvm-commits

Differential Revision: http://reviews.llvm.org/D22250

llvm-svn: 275202

include/llvm/InitializePasses.h

@@ -177,7 +177,7 @@ void initializeLoopDataPrefetchPass(PassRegistry&);
 void initializeLoopDeletionPass(PassRegistry&);
 void initializeLoopDistributePass(PassRegistry&);
 void initializeLoopExtractorPass(PassRegistry&);
-void initializeLoopIdiomRecognizePass(PassRegistry&);
+void initializeLoopIdiomRecognizeLegacyPassPass(PassRegistry&);
 void initializeLoopInfoWrapperPassPass(PassRegistry&);
 void initializeLoopInstSimplifyPass(PassRegistry&);
 void initializeLoopInterchangePass(PassRegistry &);

include/llvm/Transforms/Scalar/LoopIdiomRecognize.h

@@ -0,0 +1,31 @@
+//===- LoopIdiomRecognize.h - Loop Idiom Recognize Pass -------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This pass implements an idiom recognizer that transforms simple loops into a
+// non-loop form.  In cases that this kicks in, it can be a significant
+// performance win.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_SCALAR_LOOPIDIOMRECOGNIZE_H
+#define LLVM_TRANSFORMS_SCALAR_LOOPIDIOMRECOGNIZE_H
+
+#include "llvm/Analysis/LoopInfo.h"
+#include "llvm/IR/PassManager.h"
+
+namespace llvm {
+
+/// Performs Loop Idiom Recognize Pass.
+class LoopIdiomRecognizePass : public PassInfoMixin<LoopIdiomRecognizePass> {
+public:
+  PreservedAnalyses run(Loop &L, AnalysisManager<Loop> &AM);
+};
+} // end namespace llvm
+
+#endif // LLVM_TRANSFORMS_SCALAR_LOOPIDIOMRECOGNIZE_H

lib/Passes/PassBuilder.cpp

@@ -88,6 +88,7 @@
 #include "llvm/Transforms/Scalar/GuardWidening.h"
 #include "llvm/Transforms/Scalar/IndVarSimplify.h"
 #include "llvm/Transforms/Scalar/JumpThreading.h"
+#include "llvm/Transforms/Scalar/LoopIdiomRecognize.h"
 #include "llvm/Transforms/Scalar/LoopRotation.h"
 #include "llvm/Transforms/Scalar/LoopSimplifyCFG.h"
 #include "llvm/Transforms/Scalar/LowerAtomic.h"

lib/Passes/PassRegistry.def

@@ -187,6 +187,7 @@ LOOP_ANALYSIS("access-info", LoopAccessAnalysis())
 #define LOOP_PASS(NAME, CREATE_PASS)
 #endif
 LOOP_PASS("invalidate<all>", InvalidateAllAnalysesPass())
+LOOP_PASS("loop-idiom", LoopIdiomRecognizePass())
 LOOP_PASS("rotate", LoopRotatePass())
 LOOP_PASS("no-op-loop", NoOpLoopPass())
 LOOP_PASS("print", PrintLoopPass(dbgs()))

lib/Transforms/Scalar/LoopIdiomRecognize.cpp

@@ -31,15 +31,16 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Transforms/Scalar.h"
+#include "llvm/Transforms/Scalar/LoopIdiomRecognize.h"
 #include "llvm/ADT/MapVector.h"
 #include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/Analysis/AliasAnalysis.h"
 #include "llvm/Analysis/BasicAliasAnalysis.h"
 #include "llvm/Analysis/GlobalsModRef.h"
-#include "llvm/Analysis/LoopPass.h"
 #include "llvm/Analysis/LoopAccessAnalysis.h"
+#include "llvm/Analysis/LoopPass.h"
+#include "llvm/Analysis/LoopPassManager.h"
 #include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h"
 #include "llvm/Analysis/ScalarEvolutionExpander.h"
 #include "llvm/Analysis/ScalarEvolutionExpressions.h"
@@ -53,6 +54,7 @@
 #include "llvm/IR/Module.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/Transforms/Scalar.h"
 #include "llvm/Transforms/Utils/BuildLibCalls.h"
 #include "llvm/Transforms/Utils/Local.h"
 #include "llvm/Transforms/Utils/LoopUtils.h"
@@ -65,7 +67,7 @@ STATISTIC(NumMemCpy, "Number of memcpy's formed from loop load+stores");
 
 namespace {
 
-class LoopIdiomRecognize : public LoopPass {
+class LoopIdiomRecognize {
   Loop *CurLoop;
   AliasAnalysis *AA;
   DominatorTree *DT;
@@ -76,21 +78,15 @@ class LoopIdiomRecognize : public LoopPass {
   const DataLayout *DL;
 
 public:
-  static char ID;
-  explicit LoopIdiomRecognize() : LoopPass(ID) {
-    initializeLoopIdiomRecognizePass(*PassRegistry::getPassRegistry());
-  }
+  explicit LoopIdiomRecognize(AliasAnalysis *AA, DominatorTree *DT,
+                              LoopInfo *LI, ScalarEvolution *SE,
+                              TargetLibraryInfo *TLI,
+                              const TargetTransformInfo *TTI,
+                              const DataLayout *DL)
+      : CurLoop(nullptr), AA(AA), DT(DT), LI(LI), SE(SE), TLI(TLI), TTI(TTI),
+        DL(DL) {}
 
-  bool runOnLoop(Loop *L, LPPassManager &LPM) override;
-
-  /// This transformation requires natural loop information & requires that
-  /// loop preheaders be inserted into the CFG.
-  ///
-  void getAnalysisUsage(AnalysisUsage &AU) const override {
-    AU.addRequired<TargetLibraryInfoWrapperPass>();
-    AU.addRequired<TargetTransformInfoWrapperPass>();
-    getLoopAnalysisUsage(AU);
-  }
+  bool runOnLoop(Loop *L);
 
 private:
   typedef SmallVector<StoreInst *, 8> StoreList;
@@ -137,18 +133,78 @@ private:
   /// @}
 };
 
+class LoopIdiomRecognizeLegacyPass : public LoopPass {
+public:
+  static char ID;
+  explicit LoopIdiomRecognizeLegacyPass() : LoopPass(ID) {
+    initializeLoopIdiomRecognizeLegacyPassPass(
+        *PassRegistry::getPassRegistry());
+  }
+
+  bool runOnLoop(Loop *L, LPPassManager &LPM) override {
+    if (skipLoop(L))
+      return false;
+
+    AliasAnalysis *AA = &getAnalysis<AAResultsWrapperPass>().getAAResults();
+    DominatorTree *DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
+    LoopInfo *LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
+    ScalarEvolution *SE = &getAnalysis<ScalarEvolutionWrapperPass>().getSE();
+    TargetLibraryInfo *TLI =
+        &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
+    const TargetTransformInfo *TTI =
+        &getAnalysis<TargetTransformInfoWrapperPass>().getTTI(
+            *L->getHeader()->getParent());
+    const DataLayout *DL = &L->getHeader()->getModule()->getDataLayout();
+
+    LoopIdiomRecognize LIR(AA, DT, LI, SE, TLI, TTI, DL);
+    return LIR.runOnLoop(L);
+  }
+
+  /// This transformation requires natural loop information & requires that
+  /// loop preheaders be inserted into the CFG.
+  ///
+  void getAnalysisUsage(AnalysisUsage &AU) const override {
+    AU.addRequired<TargetLibraryInfoWrapperPass>();
+    AU.addRequired<TargetTransformInfoWrapperPass>();
+    getLoopAnalysisUsage(AU);
+  }
+};
 } // End anonymous namespace.
 
-char LoopIdiomRecognize::ID = 0;
-INITIALIZE_PASS_BEGIN(LoopIdiomRecognize, "loop-idiom", "Recognize loop idioms",
-                      false, false)
+PreservedAnalyses LoopIdiomRecognizePass::run(Loop &L,
+                                              AnalysisManager<Loop> &AM) {
+  const auto &FAM =
+      AM.getResult<FunctionAnalysisManagerLoopProxy>(L).getManager();
+  Function *F = L.getHeader()->getParent();
+
+  // Use getCachedResult because Loop pass cannot trigger a function analysis.
+  auto *AA = FAM.getCachedResult<AAManager>(*F);
+  auto *DT = FAM.getCachedResult<DominatorTreeAnalysis>(*F);
+  auto *LI = FAM.getCachedResult<LoopAnalysis>(*F);
+  auto *SE = FAM.getCachedResult<ScalarEvolutionAnalysis>(*F);
+  auto *TLI = FAM.getCachedResult<TargetLibraryAnalysis>(*F);
+  const auto *TTI = FAM.getCachedResult<TargetIRAnalysis>(*F);
+  const auto *DL = &L.getHeader()->getModule()->getDataLayout();
+  assert((AA && DT && LI && SE && TLI && TTI && DL) &&
+         "Analyses for Loop Idiom Recognition not available");
+
+  LoopIdiomRecognize LIR(AA, DT, LI, SE, TLI, TTI, DL);
+  if (!LIR.runOnLoop(&L))
+    return PreservedAnalyses::all();
+
+  return getLoopPassPreservedAnalyses();
+}
+
+char LoopIdiomRecognizeLegacyPass::ID = 0;
+INITIALIZE_PASS_BEGIN(LoopIdiomRecognizeLegacyPass, "loop-idiom",
+                      "Recognize loop idioms", false, false)
 INITIALIZE_PASS_DEPENDENCY(LoopPass)
 INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
 INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
-INITIALIZE_PASS_END(LoopIdiomRecognize, "loop-idiom", "Recognize loop idioms",
-                    false, false)
+INITIALIZE_PASS_END(LoopIdiomRecognizeLegacyPass, "loop-idiom",
+                    "Recognize loop idioms", false, false)
 
-Pass *llvm::createLoopIdiomPass() { return new LoopIdiomRecognize(); }
+Pass *llvm::createLoopIdiomPass() { return new LoopIdiomRecognizeLegacyPass(); }
 
 static void deleteDeadInstruction(Instruction *I) {
   I->replaceAllUsesWith(UndefValue::get(I->getType()));
@@ -161,10 +217,7 @@ static void deleteDeadInstruction(Instruction *I) {
 //
 //===----------------------------------------------------------------------===//
 
-bool LoopIdiomRecognize::runOnLoop(Loop *L, LPPassManager &LPM) {
-  if (skipLoop(L))
-    return false;
-
+bool LoopIdiomRecognize::runOnLoop(Loop *L) {
   CurLoop = L;
   // If the loop could not be converted to canonical form, it must have an
   // indirectbr in it, just give up.
@@ -176,15 +229,6 @@ bool LoopIdiomRecognize::runOnLoop(Loop *L, LPPassManager &LPM) {
   if (Name == "memset" || Name == "memcpy")
     return false;
 
-  AA = &getAnalysis<AAResultsWrapperPass>().getAAResults();
-  DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
-  LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
-  SE = &getAnalysis<ScalarEvolutionWrapperPass>().getSE();
-  TLI = &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
-  TTI = &getAnalysis<TargetTransformInfoWrapperPass>().getTTI(
-      *CurLoop->getHeader()->getParent());
-  DL = &CurLoop->getHeader()->getModule()->getDataLayout();
-
   HasMemset = TLI->has(LibFunc::memset);
   HasMemsetPattern = TLI->has(LibFunc::memset_pattern16);
   HasMemcpy = TLI->has(LibFunc::memcpy);

lib/Transforms/Scalar/Scalar.cpp

@@ -60,7 +60,7 @@ void llvm::initializeScalarOpts(PassRegistry &Registry) {
   initializeLoopUnrollPass(Registry);
   initializeLoopUnswitchPass(Registry);
   initializeLoopVersioningLICMPass(Registry);
-  initializeLoopIdiomRecognizePass(Registry);
+  initializeLoopIdiomRecognizeLegacyPassPass(Registry);
   initializeLowerAtomicLegacyPassPass(Registry);
   initializeLowerExpectIntrinsicPass(Registry);
   initializeLowerGuardIntrinsicPass(Registry);

test/Transforms/LoopIdiom/nontemporal_store.ll

@@ -1,4 +1,5 @@
 ; RUN: opt -loop-idiom < %s -S | FileCheck %s
+; RUN: opt -aa-pipeline=basic-aa -passes='require<aa>,require<targetir>,require<scalar-evolution>,loop(loop-idiom)' < %s -S | FileCheck %s
 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"