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📄 ADCE.cpp(24.71 KB)
📄 AlignmentFromAssumptions.cpp(15.9 KB)
📄 BDCE.cpp(7.42 KB)
📄 CallSiteSplitting.cpp(21.43 KB)
📄 ConstantHoisting.cpp(38.95 KB)
📄 ConstantProp.cpp(4.13 KB)
📄 CorrelatedValuePropagation.cpp(32.36 KB)
📄 DCE.cpp(6.84 KB)
📄 DeadStoreElimination.cpp(91.51 KB)
📄 DivRemPairs.cpp(15.01 KB)
📄 EarlyCSE.cpp(57.05 KB)
📄 FlattenCFGPass.cpp(2.74 KB)
📄 Float2Int.cpp(18.19 KB)
📄 GVN.cpp(100.11 KB)
📄 GVNHoist.cpp(44.85 KB)
📄 GVNSink.cpp(29.97 KB)
📄 GuardWidening.cpp(32.36 KB)
📄 IVUsersPrinter.cpp(839 B)
📄 IndVarSimplify.cpp(113.49 KB)
📄 InductiveRangeCheckElimination.cpp(72.96 KB)
📄 InferAddressSpaces.cpp(44.22 KB)
📄 InstSimplifyPass.cpp(5.39 KB)
📄 JumpThreading.cpp(115.06 KB)
📄 LICM.cpp(92.71 KB)
📄 LoopAccessAnalysisPrinter.cpp(977 B)
📄 LoopDataPrefetch.cpp(14.54 KB)
📄 LoopDeletion.cpp(11.37 KB)
📄 LoopDistribute.cpp(40.25 KB)
📄 LoopFuse.cpp(68.6 KB)
📄 LoopIdiomRecognize.cpp(69.09 KB)
📄 LoopInstSimplify.cpp(9.38 KB)
📄 LoopInterchange.cpp(60.65 KB)
📄 LoopLoadElimination.cpp(26.71 KB)
📄 LoopPassManager.cpp(4.02 KB)
📄 LoopPredication.cpp(49.21 KB)
📄 LoopRerollPass.cpp(58.54 KB)
📄 LoopRotation.cpp(4.79 KB)
📄 LoopSimplifyCFG.cpp(28.59 KB)
📄 LoopSink.cpp(14.93 KB)
📄 LoopStrengthReduce.cpp(216.88 KB)
📄 LoopUnrollAndJamPass.cpp(21.07 KB)
📄 LoopUnrollPass.cpp(60.73 KB)
📄 LoopUnswitch.cpp(64.17 KB)
📄 LoopVersioningLICM.cpp(23.65 KB)
📄 LowerAtomic.cpp(5.12 KB)
📄 LowerConstantIntrinsics.cpp(5.8 KB)
📄 LowerExpectIntrinsic.cpp(15 KB)
📄 LowerGuardIntrinsic.cpp(2.82 KB)
📄 LowerMatrixIntrinsics.cpp(73.36 KB)
📄 LowerWidenableCondition.cpp(2.75 KB)
📄 MakeGuardsExplicit.cpp(3.83 KB)
📄 MemCpyOptimizer.cpp(52.16 KB)
📄 MergeICmps.cpp(35.61 KB)
📄 MergedLoadStoreMotion.cpp(15.18 KB)
📄 NaryReassociate.cpp(19.86 KB)
📄 NewGVN.cpp(170.95 KB)
📄 PartiallyInlineLibCalls.cpp(6.22 KB)
📄 PlaceSafepoints.cpp(27.5 KB)
📄 Reassociate.cpp(95.61 KB)
📄 Reg2Mem.cpp(4.34 KB)
📄 RewriteStatepointsForGC.cpp(116.35 KB)
📄 SCCP.cpp(76.12 KB)
📄 SROA.cpp(183.83 KB)
📄 Scalar.cpp(10.08 KB)
📄 Scalarizer.cpp(32.93 KB)
📄 SeparateConstOffsetFromGEP.cpp(52.99 KB)
📄 SimpleLoopUnswitch.cpp(124.57 KB)
📄 SimplifyCFGPass.cpp(12.31 KB)
📄 Sink.cpp(10.81 KB)
📄 SpeculateAroundPHIs.cpp(35.69 KB)
📄 SpeculativeExecution.cpp(11.54 KB)
📄 StraightLineStrengthReduce.cpp(28.92 KB)
📄 StructurizeCFG.cpp(32.49 KB)
📄 TailRecursionElimination.cpp(34.9 KB)
📄 WarnMissedTransforms.cpp(6.14 KB)

Editing: WarnMissedTransforms.cpp

//===- LoopTransformWarning.cpp -  ----------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Emit warnings if forced code transformations have not been performed.
//
//===----------------------------------------------------------------------===//

#include "llvm/Transforms/Scalar/WarnMissedTransforms.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/OptimizationRemarkEmitter.h"
#include "llvm/InitializePasses.h"
#include "llvm/Transforms/Utils/LoopUtils.h"

using namespace llvm;

#define DEBUG_TYPE "transform-warning"

/// Emit warnings for forced (i.e. user-defined) loop transformations which have
/// still not been performed.
static void warnAboutLeftoverTransformations(Loop *L,
                                             OptimizationRemarkEmitter *ORE) {
  if (hasUnrollTransformation(L) == TM_ForcedByUser) {
    LLVM_DEBUG(dbgs() << "Leftover unroll transformation\n");
    ORE->emit(
        DiagnosticInfoOptimizationFailure(DEBUG_TYPE,
                                          "FailedRequestedUnrolling",
                                          L->getStartLoc(), L->getHeader())
        << "loop not unrolled: the optimizer was unable to perform the "
           "requested transformation; the transformation might be disabled or "
           "specified as part of an unsupported transformation ordering");
  }

if (hasUnrollAndJamTransformation(L) == TM_ForcedByUser) {
    LLVM_DEBUG(dbgs() << "Leftover unroll-and-jam transformation\n");
    ORE->emit(
        DiagnosticInfoOptimizationFailure(DEBUG_TYPE,
                                          "FailedRequestedUnrollAndJamming",
                                          L->getStartLoc(), L->getHeader())
        << "loop not unroll-and-jammed: the optimizer was unable to perform "
           "the requested transformation; the transformation might be disabled "
           "or specified as part of an unsupported transformation ordering");
  }

if (hasVectorizeTransformation(L) == TM_ForcedByUser) {
    LLVM_DEBUG(dbgs() << "Leftover vectorization transformation\n");
    Optional<int> VectorizeWidth =
        getOptionalIntLoopAttribute(L, "llvm.loop.vectorize.width");
    Optional<int> InterleaveCount =
        getOptionalIntLoopAttribute(L, "llvm.loop.interleave.count");

if (VectorizeWidth.getValueOr(0) != 1)
      ORE->emit(
          DiagnosticInfoOptimizationFailure(DEBUG_TYPE,
                                            "FailedRequestedVectorization",
                                            L->getStartLoc(), L->getHeader())
          << "loop not vectorized: the optimizer was unable to perform the "
             "requested transformation; the transformation might be disabled "
             "or specified as part of an unsupported transformation ordering");
    else if (InterleaveCount.getValueOr(0) != 1)
      ORE->emit(
          DiagnosticInfoOptimizationFailure(DEBUG_TYPE,
                                            "FailedRequestedInterleaving",
                                            L->getStartLoc(), L->getHeader())
          << "loop not interleaved: the optimizer was unable to perform the "
             "requested transformation; the transformation might be disabled "
             "or specified as part of an unsupported transformation ordering");
  }

if (hasDistributeTransformation(L) == TM_ForcedByUser) {
    LLVM_DEBUG(dbgs() << "Leftover distribute transformation\n");
    ORE->emit(
        DiagnosticInfoOptimizationFailure(DEBUG_TYPE,
                                          "FailedRequestedDistribution",
                                          L->getStartLoc(), L->getHeader())
        << "loop not distributed: the optimizer was unable to perform the "
           "requested transformation; the transformation might be disabled or "
           "specified as part of an unsupported transformation ordering");
  }
}

static void warnAboutLeftoverTransformations(Function *F, LoopInfo *LI,
                                             OptimizationRemarkEmitter *ORE) {
  for (auto *L : LI->getLoopsInPreorder())
    warnAboutLeftoverTransformations(L, ORE);
}

// New pass manager boilerplate
PreservedAnalyses
WarnMissedTransformationsPass::run(Function &F, FunctionAnalysisManager &AM) {
  // Do not warn about not applied transformations if optimizations are
  // disabled.
  if (F.hasOptNone())
    return PreservedAnalyses::all();

auto &ORE = AM.getResult<OptimizationRemarkEmitterAnalysis>(F);
  auto &LI = AM.getResult<LoopAnalysis>(F);

warnAboutLeftoverTransformations(&F, &LI, &ORE);

return PreservedAnalyses::all();
}

// Legacy pass manager boilerplate
namespace {
class WarnMissedTransformationsLegacy : public FunctionPass {
public:
  static char ID;

explicit WarnMissedTransformationsLegacy() : FunctionPass(ID) {
    initializeWarnMissedTransformationsLegacyPass(
        *PassRegistry::getPassRegistry());
  }

bool runOnFunction(Function &F) override {
    if (skipFunction(F))
      return false;

auto &ORE = getAnalysis<OptimizationRemarkEmitterWrapperPass>().getORE();
    auto &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();

warnAboutLeftoverTransformations(&F, &LI, &ORE);
    return false;
  }

void getAnalysisUsage(AnalysisUsage &AU) const override {
    AU.addRequired<OptimizationRemarkEmitterWrapperPass>();
    AU.addRequired<LoopInfoWrapperPass>();

AU.setPreservesAll();
  }
};
} // end anonymous namespace

char WarnMissedTransformationsLegacy::ID = 0;

INITIALIZE_PASS_BEGIN(WarnMissedTransformationsLegacy, "transform-warning",
                      "Warn about non-applied transformations", false, false)
INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
INITIALIZE_PASS_DEPENDENCY(OptimizationRemarkEmitterWrapperPass)
INITIALIZE_PASS_END(WarnMissedTransformationsLegacy, "transform-warning",
                    "Warn about non-applied transformations", false, false)

Pass *llvm::createWarnMissedTransformationsPass() {
  return new WarnMissedTransformationsLegacy();
}

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Editing: WarnMissedTransforms.cpp

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