[llvm] cea7a3f - [LoopUnrollAndJam] Change LoopUnrollAndJamPass to LoopNest pass
via llvm-commits
llvm-commits at lists.llvm.org
Fri May 21 07:57:55 PDT 2021
Author: maekawatoshiki
Date: 2021-05-21T23:57:39+09:00
New Revision: cea7a3fe3d1fc91a00cb54cee3ac6f361343417e
URL: https://github.com/llvm/llvm-project/commit/cea7a3fe3d1fc91a00cb54cee3ac6f361343417e
DIFF: https://github.com/llvm/llvm-project/commit/cea7a3fe3d1fc91a00cb54cee3ac6f361343417e.diff
LOG: [LoopUnrollAndJam] Change LoopUnrollAndJamPass to LoopNest pass
This patch changes LoopUnrollAndJamPass from FunctionPass to LoopNest pass.
The next patch will utilize LoopNest to effectively handle loop nests.
Reviewed By: Whitney
Differential Revision: https://reviews.llvm.org/D99149
Added:
Modified:
llvm/include/llvm/Transforms/Scalar/LoopUnrollAndJamPass.h
llvm/lib/Passes/PassBuilder.cpp
llvm/lib/Passes/PassRegistry.def
llvm/lib/Transforms/Scalar/LoopUnrollAndJamPass.cpp
llvm/test/Transforms/LoopUnrollAndJam/innerloop.ll
Removed:
################################################################################
diff --git a/llvm/include/llvm/Transforms/Scalar/LoopUnrollAndJamPass.h b/llvm/include/llvm/Transforms/Scalar/LoopUnrollAndJamPass.h
index bd83a6a0cca4d..6125fc7636a06 100644
--- a/llvm/include/llvm/Transforms/Scalar/LoopUnrollAndJamPass.h
+++ b/llvm/include/llvm/Transforms/Scalar/LoopUnrollAndJamPass.h
@@ -10,6 +10,7 @@
#define LLVM_TRANSFORMS_SCALAR_LOOPUNROLLANDJAMPASS_H
#include "llvm/IR/PassManager.h"
+#include "llvm/Transforms/Scalar/LoopPassManager.h"
namespace llvm {
class Function;
@@ -20,7 +21,8 @@ class LoopUnrollAndJamPass : public PassInfoMixin<LoopUnrollAndJamPass> {
public:
explicit LoopUnrollAndJamPass(int OptLevel = 2) : OptLevel(OptLevel) {}
- PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+ PreservedAnalyses run(LoopNest &L, LoopAnalysisManager &AM,
+ LoopStandardAnalysisResults &AR, LPMUpdater &U);
};
} // end namespace llvm
diff --git a/llvm/lib/Passes/PassBuilder.cpp b/llvm/lib/Passes/PassBuilder.cpp
index 4f18dac2d1e0e..d72896fa0a7ff 100644
--- a/llvm/lib/Passes/PassBuilder.cpp
+++ b/llvm/lib/Passes/PassBuilder.cpp
@@ -1217,7 +1217,8 @@ void PassBuilder::addVectorPasses(OptimizationLevel Level,
// across the loop nests.
// We do UnrollAndJam in a separate LPM to ensure it happens before unroll
if (EnableUnrollAndJam && PTO.LoopUnrolling)
- FPM.addPass(LoopUnrollAndJamPass(Level.getSpeedupLevel()));
+ FPM.addPass(createFunctionToLoopPassAdaptor(
+ LoopUnrollAndJamPass(Level.getSpeedupLevel())));
FPM.addPass(LoopUnrollPass(LoopUnrollOptions(
Level.getSpeedupLevel(), /*OnlyWhenForced=*/!PTO.LoopUnrolling,
PTO.ForgetAllSCEVInLoopUnroll)));
@@ -1300,7 +1301,8 @@ void PassBuilder::addVectorPasses(OptimizationLevel Level,
// across the loop nests.
// We do UnrollAndJam in a separate LPM to ensure it happens before unroll
if (EnableUnrollAndJam && PTO.LoopUnrolling) {
- FPM.addPass(LoopUnrollAndJamPass(Level.getSpeedupLevel()));
+ FPM.addPass(createFunctionToLoopPassAdaptor(
+ LoopUnrollAndJamPass(Level.getSpeedupLevel())));
}
FPM.addPass(LoopUnrollPass(LoopUnrollOptions(
Level.getSpeedupLevel(), /*OnlyWhenForced=*/!PTO.LoopUnrolling,
diff --git a/llvm/lib/Passes/PassRegistry.def b/llvm/lib/Passes/PassRegistry.def
index 66bbe6eea4ada..24848c29ab090 100644
--- a/llvm/lib/Passes/PassRegistry.def
+++ b/llvm/lib/Passes/PassRegistry.def
@@ -248,7 +248,6 @@ FUNCTION_PASS("guard-widening", GuardWideningPass())
FUNCTION_PASS("load-store-vectorizer", LoadStoreVectorizerPass())
FUNCTION_PASS("loop-simplify", LoopSimplifyPass())
FUNCTION_PASS("loop-sink", LoopSinkPass())
-FUNCTION_PASS("loop-unroll-and-jam", LoopUnrollAndJamPass())
FUNCTION_PASS("loop-flatten", LoopFlattenPass())
FUNCTION_PASS("lowerinvoke", LowerInvokePass())
FUNCTION_PASS("lowerswitch", LowerSwitchPass())
@@ -400,6 +399,7 @@ LOOP_PASS("loop-deletion", LoopDeletionPass())
LOOP_PASS("loop-simplifycfg", LoopSimplifyCFGPass())
LOOP_PASS("loop-reduce", LoopStrengthReducePass())
LOOP_PASS("indvars", IndVarSimplifyPass())
+LOOP_PASS("loop-unroll-and-jam", LoopUnrollAndJamPass())
LOOP_PASS("loop-unroll-full", LoopFullUnrollPass())
LOOP_PASS("print-access-info", LoopAccessInfoPrinterPass(dbgs()))
LOOP_PASS("print<ddg>", DDGAnalysisPrinterPass(dbgs()))
diff --git a/llvm/lib/Transforms/Scalar/LoopUnrollAndJamPass.cpp b/llvm/lib/Transforms/Scalar/LoopUnrollAndJamPass.cpp
index 495906e1a7630..74b7b820aedf9 100644
--- a/llvm/lib/Transforms/Scalar/LoopUnrollAndJamPass.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopUnrollAndJamPass.cpp
@@ -22,6 +22,7 @@
#include "llvm/Analysis/DependenceAnalysis.h"
#include "llvm/Analysis/LoopAnalysisManager.h"
#include "llvm/Analysis/LoopInfo.h"
+#include "llvm/Analysis/LoopPass.h"
#include "llvm/Analysis/OptimizationRemarkEmitter.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/Analysis/TargetTransformInfo.h"
@@ -424,35 +425,27 @@ tryToUnrollAndJamLoop(Loop *L, DominatorTree &DT, LoopInfo *LI,
return UnrollResult;
}
-static bool tryToUnrollAndJamLoop(Function &F, DominatorTree &DT, LoopInfo &LI,
+static bool tryToUnrollAndJamLoop(LoopNest &LN, DominatorTree &DT, LoopInfo &LI,
ScalarEvolution &SE,
const TargetTransformInfo &TTI,
AssumptionCache &AC, DependenceInfo &DI,
- OptimizationRemarkEmitter &ORE,
- int OptLevel) {
+ OptimizationRemarkEmitter &ORE, int OptLevel,
+ bool &CurrentLoopDeleted) {
bool DidSomething = false;
+ ArrayRef<Loop *> Loops = LN.getLoops();
- // The loop unroll and jam pass requires loops to be in simplified form, and
- // also needs LCSSA. Since simplification may add new inner loops, it has to
- // run before the legality and profitability checks. This means running the
- // loop unroll and jam pass will simplify all loops, regardless of whether
- // anything end up being unroll and jammed.
- for (auto &L : LI) {
- DidSomething |=
- simplifyLoop(L, &DT, &LI, &SE, &AC, nullptr, false /* PreserveLCSSA */);
- DidSomething |= formLCSSARecursively(*L, DT, &LI, &SE);
- }
-
- // Add the loop nests in the reverse order of LoopInfo. See method
+ // Add the loop nests in the reverse order of LN. See method
// declaration.
SmallPriorityWorklist<Loop *, 4> Worklist;
- appendLoopsToWorklist(LI, Worklist);
+ appendLoopsToWorklist(Loops, Worklist);
while (!Worklist.empty()) {
Loop *L = Worklist.pop_back_val();
LoopUnrollResult Result =
tryToUnrollAndJamLoop(L, DT, &LI, SE, TTI, AC, DI, ORE, OptLevel);
if (Result != LoopUnrollResult::Unmodified)
DidSomething = true;
+ if (L->isOutermost() && Result == LoopUnrollResult::FullyUnrolled)
+ CurrentLoopDeleted = true;
}
return DidSomething;
@@ -460,29 +453,35 @@ static bool tryToUnrollAndJamLoop(Function &F, DominatorTree &DT, LoopInfo &LI,
namespace {
-class LoopUnrollAndJam : public FunctionPass {
+class LoopUnrollAndJam : public LoopPass {
public:
static char ID; // Pass ID, replacement for typeid
unsigned OptLevel;
- LoopUnrollAndJam(int OptLevel = 2) : FunctionPass(ID), OptLevel(OptLevel) {
+ LoopUnrollAndJam(int OptLevel = 2) : LoopPass(ID), OptLevel(OptLevel) {
initializeLoopUnrollAndJamPass(*PassRegistry::getPassRegistry());
}
- bool runOnFunction(Function &F) override {
- if (skipFunction(F))
+ bool runOnLoop(Loop *L, LPPassManager &LPM) override {
+ if (skipLoop(L))
return false;
- auto &DT = getAnalysis<DominatorTreeWrapperPass>().getDomTree();
- LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
- ScalarEvolution &SE = getAnalysis<ScalarEvolutionWrapperPass>().getSE();
- const TargetTransformInfo &TTI =
- getAnalysis<TargetTransformInfoWrapperPass>().getTTI(F);
- auto &AC = getAnalysis<AssumptionCacheTracker>().getAssumptionCache(F);
+ auto *F = L->getHeader()->getParent();
+ auto &SE = getAnalysis<ScalarEvolutionWrapperPass>().getSE();
+ auto *LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
auto &DI = getAnalysis<DependenceAnalysisWrapperPass>().getDI();
+ auto &DT = getAnalysis<DominatorTreeWrapperPass>().getDomTree();
+ auto &TTI = getAnalysis<TargetTransformInfoWrapperPass>().getTTI(*F);
auto &ORE = getAnalysis<OptimizationRemarkEmitterWrapperPass>().getORE();
+ auto &AC = getAnalysis<AssumptionCacheTracker>().getAssumptionCache(*F);
+
+ LoopUnrollResult Result =
+ tryToUnrollAndJamLoop(L, DT, LI, SE, TTI, AC, DI, ORE, OptLevel);
+
+ if (Result == LoopUnrollResult::FullyUnrolled)
+ LPM.markLoopAsDeleted(*L);
- return tryToUnrollAndJamLoop(F, DT, LI, SE, TTI, AC, DI, ORE, OptLevel);
+ return Result != LoopUnrollResult::Unmodified;
}
/// This transformation requires natural loop information & requires that
@@ -505,7 +504,10 @@ char LoopUnrollAndJam::ID = 0;
INITIALIZE_PASS_BEGIN(LoopUnrollAndJam, "loop-unroll-and-jam",
"Unroll and Jam loops", false, false)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
+INITIALIZE_PASS_DEPENDENCY(LoopPass)
INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
+INITIALIZE_PASS_DEPENDENCY(LoopSimplify)
+INITIALIZE_PASS_DEPENDENCY(LCSSAWrapperPass)
INITIALIZE_PASS_DEPENDENCY(ScalarEvolutionWrapperPass)
INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
@@ -518,19 +520,25 @@ Pass *llvm::createLoopUnrollAndJamPass(int OptLevel) {
return new LoopUnrollAndJam(OptLevel);
}
-PreservedAnalyses LoopUnrollAndJamPass::run(Function &F,
- FunctionAnalysisManager &AM) {
- ScalarEvolution &SE = AM.getResult<ScalarEvolutionAnalysis>(F);
- LoopInfo &LI = AM.getResult<LoopAnalysis>(F);
- TargetTransformInfo &TTI = AM.getResult<TargetIRAnalysis>(F);
- AssumptionCache &AC = AM.getResult<AssumptionAnalysis>(F);
- DominatorTree &DT = AM.getResult<DominatorTreeAnalysis>(F);
- DependenceInfo &DI = AM.getResult<DependenceAnalysis>(F);
- OptimizationRemarkEmitter &ORE =
- AM.getResult<OptimizationRemarkEmitterAnalysis>(F);
-
- if (!tryToUnrollAndJamLoop(F, DT, LI, SE, TTI, AC, DI, ORE, OptLevel))
+PreservedAnalyses LoopUnrollAndJamPass::run(LoopNest &LN,
+ LoopAnalysisManager &AM,
+ LoopStandardAnalysisResults &AR,
+ LPMUpdater &U) {
+ Function &F = *LN.getParent();
+ std::string LoopName = std::string(LN.getOutermostLoop().getName());
+
+ DependenceInfo DI(&F, &AR.AA, &AR.SE, &AR.LI);
+ OptimizationRemarkEmitter ORE(&F);
+ bool CurrentLoopDeleted = false;
+
+ if (!tryToUnrollAndJamLoop(LN, AR.DT, AR.LI, AR.SE, AR.TTI, AR.AC, DI, ORE,
+ OptLevel, CurrentLoopDeleted))
return PreservedAnalyses::all();
- return getLoopPassPreservedAnalyses();
+ if (CurrentLoopDeleted)
+ U.markLoopAsDeleted(LN.getOutermostLoop(), LoopName);
+
+ auto PA = getLoopPassPreservedAnalyses();
+ PA.preserve<LoopNestAnalysis>();
+ return PA;
}
diff --git a/llvm/test/Transforms/LoopUnrollAndJam/innerloop.ll b/llvm/test/Transforms/LoopUnrollAndJam/innerloop.ll
index 79c32c90174eb..c3a4ebd6dede5 100644
--- a/llvm/test/Transforms/LoopUnrollAndJam/innerloop.ll
+++ b/llvm/test/Transforms/LoopUnrollAndJam/innerloop.ll
@@ -1,5 +1,5 @@
; RUN: opt -loop-unroll-and-jam -allow-unroll-and-jam -verify-loop-info < %s -S | FileCheck %s
-; RUN: opt -passes='loop-unroll-and-jam,verify<loops>' -allow-unroll-and-jam < %s -S | FileCheck %s
+; RUN: opt -passes='loop(loop-unroll-and-jam),verify<loops>' -allow-unroll-and-jam < %s -S | FileCheck %s
; Check that the newly created loops to not fail to be added to LI
; This test deliberately disables UnJ on the middle loop, performing it instead on the
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